Same here. Did this finally work well for you? I would like to measure NIR intensity changes under the sun at different times of the day and with clear sky vs some clouds etc. But not sure if this can handle and give a roughly accurate indication directly from sunlight?
Wow, I must say that this is a really nice tutorial indeed! Cheap and surprisingly efficient :) Just one note though: you could've covered the slit on the wood up with something (say two razor blades) to make it even thinner, because the shortcomings of a wider slit (namely distortion and ghost images) was really apparent from the video as well ;)
@@bobbyayotte3623 No, the slit needs to be as narrow as possible in order to make the results as focused and precise as possible (this device is basically a variant of the camera obscura). Instead of the crude slit cut into the wood a really thin slit should've been created. And the easiest way to achieve that is by letting the light pass between the blades of two razor blades, which usually have a VERY flat and uniform edge, thus making for ideal slit material.
@@CoolKoon OLD GUY HERE.. I need a little more about your slit comment. Please describe YOU.. creating the perfect slit. I would greatly appreciate. I could really use a spectrum analyzer and money is a real consideration. So I have to try building one.
@@riverman4798 I can only repeat myself: the concept is very similar to a camera obscura: the narrower the slit, the better the result. At around 3:23 this becomes really apparent when the author uses a fluorescent lamp for calibration: instead of a narrow line and sharp peaks the image is rather blurry and the line has tall points around the peaks. This (along with what the author has called "unstable peaks") basically means a lot of noise and makes the readings less reliable, particularly for light sources with discrete peaks (like fluorescent lights, LEDs, mercury vapor etc.). The way I'd construct the slit is that I'd affix one of the razor blades first, then I'd turn on the contraption and would slowly keep sliding the other blade closer and closer until I'm satisfied with the reading on the screen. And I'd make sure that the slit is truly the only source the insides could get any light from.
Hey! Great video but what if I want to introduce a sample and measure the transmittance/absorbance. How do I introduce the sample in the set up? And if I have preset filters how do I obtain data from the set up?
Thank you for this excellent demonstration, it is very inspiring! Would something like this be capable of at-home metallurgical analysis with a proper vacuum?
I’m planning a similar project with a similar camera from EBay, the specs say cam has auto brightness and colour correction. Would this cause a problem in the spectrum, or there’s a setting on the PC in the program to control this?
You will get better results if you remove the blue dye from the split DVD. You can also use CD but the resolution is lower. The CD can be used without any modifications as a reflective grating. DVD can also be used as a reflective grating but the blue dye will interfere a bit.
Where you had connected DVD Diffraction grading? Have you connected the mirror? At the edge of the slit? Or you have connected in front of the camera-Lens?
Hello, it is possible for theremino spectrometer to be attached to a new software that showing the meaning of the readings of thermino spectrometer? Please answer.
Thank you for the interesting video however, you have not mentioned that how you synchronised your camera with your software and which software did you use for it?
woah this is cool. Okay so NOW how do we make this homemade Spectrometer into a molecular scanner so we can tell if food or water is safe? I wanna know!
in general I like this device very much and will definitely build it but I have a question. I do not know if I only think so, but I think this spectrometer has a problem with reading deep red, for example in a filament bulb you can see a large decrease in the light intensity in the red spectrum, and it shouldn't be?
The problem is that most of these spectrometers aren't calibrated for the spectral response of the CMOS imaging sensor of the webcams. All those webcam spectrometer programs assume that the CMOS sensor is equally sensitive to light from ~300nm to ~1100nm. In reality though, most CMOS sensors have color filters (see Bayer sensor and the used filters) which influence the sensitivity on the RGB channels of the camera and furthermore the sensor itself, even without the filters doesn't have a constant sensitivity. With most CMOS sensors with Bayer color filters, peak sensitivity is reached around 550nm (which is also close to the peak sensitivity of the eye) which is green and very often a second peak exists at around 800nm (which is barely visible to humans and can be considered near infrared). In between those two peaks the sensitivity usually drops to a minimum between 600nm and 700nm to around 50% (which is exactly where the drop is located in the spectrum in the video) and towards the UVA region, the sensitivity quickly drops and reaches nearly zero beyond 350nm to 300nm. This is due to the Bayer color filters (and the microlenses on top of the filters) which are partially opaque to the lower region of UVA and usually fully opaque to UVB and UVC. On the infrared spectrum, the sensitivity more or less linearly drops from the second sensitivity peak at around 800nm to zero at around 1100nm (which explains the more or less linear drop in the measured IR spectrum of the incandescent bulb shown in the video). This is due to the fact that the silicon bandgap at 300K is at 1.12 eV which corresponds to a photon with a wavelength of 1107nm. So beyond that wavelength, the photon doesn't have enough energy anymore to promote an electron from the valence band to the conduction band of the silicon semiconductor of the CMOS photoreceptors, which is necessary to generate an electric potential and therefore a signal in the CMOS sensor.
@@grima0482 Thanks. I have thought that that the drop in red spectrum is due to the fact that the diffraction grating from dvd disk is coated in something blue that absorbs red light, but now I look at it differently. Thanks again for spent time for answering.
Please can some inform me on choosing a webcam for this? I bought one with a glass lens, I can't take it apart to remove any filters that may be there. However from my understanding glass blocks UV and some IR. Does it matter too much?
The incandescent light is a black body radiator so the spectrum of that light should follow Planck's law. If not, then something is wrong with your spectrum analyzer.
It's not incandescent technically speaking... the ir is nothing but photons at a frequency that our human eyes cannot see... that doesn't mean it's not there... Planck's Law only applies when there is a no net flow of energy between the body and the environment... not the case here... so yep you got it wrong there...
An incandescent light source is technically an incandescent light source. Then you could of course argue that the glass around that light source is absorbing some of the light but it will be incandescent nonetheless, and you should still be able to fit a Planck distribution around it. What the human eye can see and cannot see is irrelevant for this discourse. Yes, in common thermal dynamics one apply the principles of the canonical ensemble. Things become much easier to calculate when you assume stationary states. Non-stationary processes are generally much much much more difficult to simulate. And yes, the filament can be assumed to be thermally stationary. It isn't exactly that the temperature keeps increasing until it evaporates. The filament of an incandescent lamp has a stationary temperature while it is powered on, otherwise it would break quite soon. So the Planck's law applies just fine here. Even if we assumed that the temperature wouldn't be stationary, you could assume a local stationarity within a short time frame. The process is slow, it isn't like the mixing of two gasses or anything.
@@iberiuspred4906 i wasn't even talking about the thermal exchange... lets just consider the frequency here... that is exactly what the ir detector is using... it is simply detecting any photon is passing or not... it doesn't even need to consider the temperature to detect presence of light... hence the law won't be applicable... as thermal exchange isn't even the parameter here for consideration...
The transmission grating has multiple orders. If the principle order of the spectrograph is m=1 then there will be a response for the order m=2, which will cause light at 400 nm to appear in the spectrum at 800 nm, etc. From the geometry of the spectrograph it looks like the principle order might be m=2, so the third order at 400 nm will appear at 600 nm, etc. I suspect that this is why the measured spectrum of the incandescent light is so non-thermal.
hello, excellent your video. I have a question for you. What low power and voltage light would you recommend to make a portable spectrophotometer? Thank
Thanks for the video. I don't find the Trust WB-6250X(no longer purchasable) webcam give in the thermino assembly pdf. could you please help me what camera should be good for this reason, and also I am on a tight budget. Thank you
Hi, I was using 'Trust SpotLight Pro' in this video, it is pretty good for the spectrum analyzer because you can easily remove IR filer from it, and also it has good enough resolution. Maybe there are more good webcams for this project but I don't know about them because I did not try them.
@Youngsun Kim, yes, you will be able to see more details on the spectrum. But it also depends on other factors, for example you can only get high resolution spectrum with a narrow slit.
should work with any cheapo camera really, my advice is to also stick away from using a dvd but instead use a proper LINEAR diffraction grating, they are cheaper but will give more accurate results, however if a diy type thing is what your going for than a dvd works just fine.
Does anyone have an idea how you get the spectrum to go the whole width of the camera or do adjust it for that? I tried to make a different one but the the 'rainbow' is only on a narrow field of the camera and I can't get the software to compensate for it. It would seem like I have to put the camera far away from the grating in order to get it to widen out.
it's useful and amazing. But can I replace the camera by the onther one and can you suggest me another one?. All of you camera suggestion is no longer available :(
Can you make this for a test tube so I can build one for analysys. Have a drop down slot and mount a light inside with a mirror. Spectrometers are used for chemical analysis reading light sources is pretty useless.
Not really useless, these are great for testing filters for photography, UV and IR pass as why I'm here. Need something better than putting a broken dvd in front of my lens filter, which works, but need something more accurate.
Great video, thanks for sharing. Would be great to see if there's enough spectral resolution to detect absorbance in chlorophyll ( from garden grass ) used in photosynthesis.
I’m thinking about making one of these but using vantablack paint on the inside of the box it should give more accurate if not close reading to the machines that cost $2500 haha
lmao, Im trying to up my light game for plants and I see your comment here. I just got a PAR meter and i wanna have a way of seeing the spectrum as well without dropping 1,000 dollars on some commercial one
@@Shonade_Malik I thought so I did watch a video on it crazy stuff 🤯 it's the closest thing to non reflective I know of apart from a black hole but part of me doesn't want to potentially turn into spaghetti for an extra 0.04% efficiency 😂
This looks like such an easy way to make a spectrometer, especially for 9th graders like me! Unfortunately I don't think you explained on how to connect the spectrometer to the webcam.
Hello, great video. Why do we need to remove the IR filter when analyzing the remote when we were able to view IR readings with the incandescent bulb? Is it because the lightbulb's IR portion is closer to the visible spectrum?
Look...i ve been trying to make it work but i just cant...the problem is that the line is very thick and cant distingusidh colors...can you give me more details?
Nice video. Do you have the link for the free Theremino spectrometer software you are using. Apparently Theremino does not give out the link at their site.
I am interested to test Whether a stone a.k.a a mineral contains iron or copper or aluminium.. After calibrating the LED light using the software.. Can it measure the absorbance and transmittant required for interpretation of substances that exist in that stone (mineral)?
Thank you for comparing the spectrumof white lamps, especially white LED and RGB-"white"-LED. I always had a feeling that this light is awkward for some reason.
The detection amount depends on the sensors. You can calibrate this with a source of known ratios, ideally a flat spectrum although that's not exactly possible. A more accurate option would be to figure out what frequency curve is emitted at what temperature and use that. It's material independent and was the birth of quantum physics is all I remember
I am going to build it up myself, I just would like to ask 2 questions: 1. why the camera has to be installed at 30 degrees angle? 2. Is it necessary to use empty CD? are readings going to be distorted when using CD with something recorded on it? Many thanks!
I suspect the angle is to allow the grating to split the light at different locations of the camera’s sensor. If you look at a CD, you see the rainbow only for light coming at some angle, not for straight light. Also, if you put the camera straight, there will be too much light and the camera sensor may saturate.
I have a big problem. I want to find the light spectrum emitted by human hand. Is it possible ? Please explain. I am very ill and dependent of radiation emitted by other human hands, which give me a lot of health benefits.I want to make a device with LED in order to replace human hand radiation. I really need of help.
Great instructional video! However, Infra-red energy is not 'wasted'. We need deep reds, near IR and IR light in the morning to produce elevated levels of mitochondrial ATP (literally our life energy) and also prepare ourselves for exposure to mid-day UV. Then again in the early evening we need it to repair damage caused by UV and to also switch from serotonin production to melatonin production. So... LED and fluorescent lights that lack deep red, near IR and IR combined with our indoors life style are detrimental to our physical and mental health. Incandescent light bulbs are the closest we can get to our ancestral life style of sitting around the campfire before sleep. And in a properly insulated house in the cooler months, their 'wasted energy' means our heating system works 60-100 watts less per light bulb used. So the argument that they are not good for the environment is complete bunk. Whose environment is it anyway? Because LEDs and fluorescent lights aren't good for OUR environment, and that's before even talking about the Mercury used in CFLs.
Hello, I agree it is not wasted in the cooler months, but in summer it is one more heat source. The light bulb I think it ok for the environment, the problem is how the electricity generated for all those bulbs... if it is burning coal then it is not good for the environment, and it's a waste if it's already hot in the house, and it is even more waste if you use air conditioning. But in the cooler months it ok, and even good, because you get all the benefits of a lightbulb, and it is especially reasonable if you need heating anyway. Health benefits are of course is one more reason to consider.
It is limited by the type of glass or plastic used for the lenses. Most common glass will absorb almost all UVB and UVC and a portion of UVA. Pure quartz glass is used for most UV transmission, including UV sanitation bulbs.
as long as your sensor is sensitive to UVC and your focusing optics dont block UVC it should work, though from what ive read you'll have a hard time detecting stuff closer to the 100nm range with a stock CMOS sensor
Usually UVC is not detectable by common CMOS sensors. While the silicon photodiodes of the CMOS sensors should in theory be able to detect UVC photons, there are some other limitations which make it impossible to detect anything below ~300nm. Most CMOS sensors use a so called Bayer pattern filter with red, green and blue color filters and ontop of the filters are also microlenses which help to focus the photons onto the photodiodes. Those color filters and also the microlenses are somewhat opaque to the lower portion of the UVA spectrum, as well as the UVB spectrum and are usually fully opaque to UVC, meaning that below more or less 300nm, no useful amount of photons reach the photodiodes. You would need a special CMOS sensor, designed for deep UV imagery (without a Bayer color filter array and without microlenses or with microlenses that are transparent for UVC) to be able to detect UVC.
Hi, Using iPhone instead of a webcam in my opinion is not a good idea. First of all, you will not be able to remove IR filter from it, and second, you probably will have problems connecting it. Removing a camera from an iPhone also will not work. I don't know about NIR spectroscopy, I only can say that this device is limited in IR spectrum, the longest wavelength it can pick up is probably about 1100 nm.
@@ElectricalPro Thanks bro. Have you tested the range of this webcam you were using - does it go below 250nm into UV-B/C range? In you video, it went below 350nm to somewhere 310nm.
I have only one UV source, it is 383 nm, you can see it at 4:24, I don't have anything with a shorter wavelength. At 3:25 you can see some ripples from about 310nm to 400nm, but it is just noise, not UV.
What will happen if I make it without diffraction grating. It seems to make no sense cuz CCD still accepted all color light signals although we used grating splited the light to rainbow.
It will not work without diffraction grating or something similar. Diffraction grating makes different colors of light fall at different places at the CCD. Basically, this device analyzes rainbow, and the rainbow will be different from different sources of light. Try to make a rainbow from a red and blue light... it will not be possible, you will still just get two colors, but they will be separated in space and that is the key, looking where that light is you can say what color it is even if you colorblind, or in the case of this device it will still work fine with Black-and-white camera. I hope it helps.
@@ElectricalPro Thanks for your reply. I see, so the key is that webcam cannot distinguish if color from pure color or mixed color by primarily colors. For example, If webcam sees yellow, without the help of diffraction grating, it fails to know whether it is pure color around 570 nm or mixed color by red color light and green color. Am I right? Thanks again
@@ElectricalPro Thanks a lot. Last question: I down the software and use it, but I cannot export txt file of spectrum. Hence I don't know the vertical value(Intensity of light). Are there any ways to deal with it?
As far as I remember there is no such feature... but I may be wrong, I am not the creator of that software. In any case the intensity will be relative not absolute value because the camera adapts to brightness of light.
![Electrical Projects [CreativeLab]](http://yt3.ggpht.com/ytc/AIdro_nXuaCebPi8RjzINYxrETo1-K9WQerCEIndpQMoSs0BfQ=s48-c-k-c0x00ffffff-no-rj)
Best of the best in the diy field, many thanks!
was looking all day at a way to get an IR spectrum measurement cheaply. Absolutely brilliant!
Glad I could help!
Same here. Did this finally work well for you? I would like to measure NIR intensity changes under the sun at different times of the day and with clear sky vs some clouds etc. But not sure if this can handle and give a roughly accurate indication directly from sunlight?
I finally got something useful in youtube I particullarly benefit with this video damn it saved from tomorrow's project seminar thanks brother 😊😊
Wow, I must say that this is a really nice tutorial indeed! Cheap and surprisingly efficient :) Just one note though: you could've covered the slit on the wood up with something (say two razor blades) to make it even thinner, because the shortcomings of a wider slit (namely distortion and ghost images) was really apparent from the video as well ;)
I'm confused, are you saying making the slit only 2 razer blade widths wide?
@@bobbyayotte3623 No, the slit needs to be as narrow as possible in order to make the results as focused and precise as possible (this device is basically a variant of the camera obscura). Instead of the crude slit cut into the wood a really thin slit should've been created. And the easiest way to achieve that is by letting the light pass between the blades of two razor blades, which usually have a VERY flat and uniform edge, thus making for ideal slit material.
@@CoolKoon OLD GUY HERE.. I need a little more about your slit comment. Please describe YOU.. creating the perfect slit. I would greatly appreciate. I could really use a spectrum analyzer and money is a real consideration. So I have to try building one.
@@riverman4798 I can only repeat myself: the concept is very similar to a camera obscura: the narrower the slit, the better the result. At around 3:23 this becomes really apparent when the author uses a fluorescent lamp for calibration: instead of a narrow line and sharp peaks the image is rather blurry and the line has tall points around the peaks. This (along with what the author has called "unstable peaks") basically means a lot of noise and makes the readings less reliable, particularly for light sources with discrete peaks (like fluorescent lights, LEDs, mercury vapor etc.). The way I'd construct the slit is that I'd affix one of the razor blades first, then I'd turn on the contraption and would slowly keep sliding the other blade closer and closer until I'm satisfied with the reading on the screen. And I'd make sure that the slit is truly the only source the insides could get any light from.
very ingenious use of a dvd as a diffraction grating....
That is awesome! Will definetly try this with my students when the pandemic allows!
Could you link to the camera you used? Not all cameras have IR filter that's this easy to remove.
Saved me a lot of money and what a great accent! Building asap!
Hey! Great video but what if I want to introduce a sample and measure the transmittance/absorbance. How do I introduce the sample in the set up? And if I have preset filters how do I obtain data from the set up?
me too wanna try ppf or ppfd or par plz!!!!
The lack of an answer is probably the answer. (Op doesn't know)
omg you saved like thousands of bucks :) suscribed!
Thank you for this excellent demonstration, it is very inspiring! Would something like this be capable of at-home metallurgical analysis with a proper vacuum?
I need buy a webcam for this specifically.
Any suggestions? Preferably one w/out the IR filter if possible lol!
I’m planning a similar project with a similar camera from EBay, the specs say cam has auto brightness and colour correction. Would this cause a problem in the spectrum, or there’s a setting on the PC in the program to control this?
Amazing tutorial! can I use this to analize rocks, or other objects?
I have the same question
You will get better results if you remove the blue dye from the split DVD. You can also use CD but the resolution is lower. The CD can be used without any modifications as a reflective grating. DVD can also be used as a reflective grating but the blue dye will interfere a bit.
Where you had connected DVD Diffraction grading? Have you connected the mirror? At the edge of the slit? Or you have connected in front of the camera-Lens?
Can the software produce a .ccss file for helping monitor calibration?
What is the adhesive used to attach the diffracting grating with the lens.Is soldering iron being used?
hot glue
Hello, it is possible for theremino spectrometer to be attached to a new software that showing the meaning of the readings of thermino spectrometer? Please answer.
Thank you for the interesting video however, you have not mentioned that how you synchronised your camera with your software and which software did you use for it?
woah this is cool. Okay so NOW how do we make this homemade Spectrometer into a molecular scanner so we can tell if food or water is safe? I wanna know!
Fantástic!, congratulations, thank you for share your project!!
in general I like this device very much and will definitely build it but I have a question. I do not know if I only think so, but I think this spectrometer has a problem with reading deep red, for example in a filament bulb you can see a large decrease in the light intensity in the red spectrum, and it shouldn't be?
The problem is that most of these spectrometers aren't calibrated for the spectral response of the CMOS imaging sensor of the webcams.
All those webcam spectrometer programs assume that the CMOS sensor is equally sensitive to light from ~300nm to ~1100nm.
In reality though, most CMOS sensors have color filters (see Bayer sensor and the used filters) which influence the sensitivity on the RGB channels of the camera and furthermore the sensor itself, even without the filters doesn't have a constant sensitivity.
With most CMOS sensors with Bayer color filters, peak sensitivity is reached around 550nm (which is also close to the peak sensitivity of the eye) which is green and very often a second peak exists at around 800nm (which is barely visible to humans and can be considered near infrared). In between those two peaks the sensitivity usually drops to a minimum between 600nm and 700nm to around 50% (which is exactly where the drop is located in the spectrum in the video) and towards the UVA region, the sensitivity quickly drops and reaches nearly zero beyond 350nm to 300nm. This is due to the Bayer color filters (and the microlenses on top of the filters) which are partially opaque to the lower region of UVA and usually fully opaque to UVB and UVC.
On the infrared spectrum, the sensitivity more or less linearly drops from the second sensitivity peak at around 800nm to zero at around 1100nm (which explains the more or less linear drop in the measured IR spectrum of the incandescent bulb shown in the video). This is due to the fact that the silicon bandgap at 300K is at 1.12 eV which corresponds to a photon with a wavelength of 1107nm. So beyond that wavelength, the photon doesn't have enough energy anymore to promote an electron from the valence band to the conduction band of the silicon semiconductor of the CMOS photoreceptors, which is necessary to generate an electric potential and therefore a signal in the CMOS sensor.
@@grima0482 Thanks. I have thought that that the drop in red spectrum is due to the fact that the diffraction grating from dvd disk is coated in something blue that absorbs red light, but now I look at it differently. Thanks again for spent time for answering.
Do you wonder what camera can see without the infrared filter? Here is what: ua-cam.com/video/HjvpyO1cJOM/v-deo.html
Please can some inform me on choosing a webcam for this? I bought one with a glass lens, I can't take it apart to remove any filters that may be there. However from my understanding glass blocks UV and some IR. Does it matter too much?
The incandescent light is a black body radiator so the spectrum of that light should follow Planck's law. If not, then something is wrong with your spectrum analyzer.
It's not incandescent technically speaking... the ir is nothing but photons at a frequency that our human eyes cannot see... that doesn't mean it's not there... Planck's Law only applies when there is a no net flow of energy between the body and the environment... not the case here... so yep you got it wrong there...
An incandescent light source is technically an incandescent light source. Then you could of course argue that the glass around that light source is absorbing some of the light but it will be incandescent nonetheless, and you should still be able to fit a Planck distribution around it.
What the human eye can see and cannot see is irrelevant for this discourse.
Yes, in common thermal dynamics one apply the principles of the canonical ensemble. Things become much easier to calculate when you assume stationary states. Non-stationary processes are generally much much much more difficult to simulate.
And yes, the filament can be assumed to be thermally stationary. It isn't exactly that the temperature keeps increasing until it evaporates. The filament of an incandescent lamp has a stationary temperature while it is powered on, otherwise it would break quite soon. So the Planck's law applies just fine here.
Even if we assumed that the temperature wouldn't be stationary, you could assume a local stationarity within a short time frame. The process is slow, it isn't like the mixing of two gasses or anything.
@@iberiuspred4906 i wasn't even talking about the thermal exchange... lets just consider the frequency here... that is exactly what the ir detector is using... it is simply detecting any photon is passing or not... it doesn't even need to consider the temperature to detect presence of light... hence the law won't be applicable... as thermal exchange isn't even the parameter here for consideration...
I was talking about the spectrum analyzer. You seem to be talking about ... something else.
The transmission grating has multiple orders. If the principle order of the spectrograph is m=1 then there will be a response for the order m=2, which will cause light at 400 nm to appear in the spectrum at 800 nm, etc. From the geometry of the spectrograph it looks like the principle order might be m=2, so the third order at 400 nm will appear at 600 nm, etc. I suspect that this is why the measured spectrum of the incandescent light is so non-thermal.
It's interesting you removed the filter to let infared through. Doesn't the glass block the UV as well?
Probably
Great, amazing
Can you please share some information on the software used in this project?
How to select wavelength for this caase? for example 400-700nm for analytical analysis of chemical solution or dye /
hello, excellent your video. I have a question for you. What low power and voltage light would you recommend to make a portable spectrophotometer? Thank
Is using CDs better than using Glass objects in any way?
Can we use it for food or fruit sample analysis
The Retina borrows from IR light to see with contrast. You need IR light. Without it, you'll notice things go a bit blurry.
Awesome project. What if I want to measure the sunlight quality? Where should the slit face?
Thank you so much
Hiii ,what is the name of the software that you're using to test for the spectrum light
Can you use a CD?
How to get absorbance value for different wavelength ?
can you drop the dimensions/measurements of the planks of wood and the measurement for the slit as well?
thanks!
Thanks for the video. I don't find the Trust WB-6250X(no longer purchasable) webcam give in the thermino assembly pdf. could you please help me what camera should be good for this reason, and also I am on a tight budget. Thank you
Hi, I was using 'Trust SpotLight Pro' in this video, it is pretty good for the spectrum analyzer because you can easily remove IR filer from it, and also it has good enough resolution. Maybe there are more good webcams for this project but I don't know about them because I did not try them.
@@ElectricalPro better resolution cam means more accurate results? Your posting is awsome. thanks alot
!!!
@Youngsun Kim, yes, you will be able to see more details on the spectrum. But it also depends on other factors, for example you can only get high resolution spectrum with a narrow slit.
@@ElectricalPro i will try narrow slit with 2 razor blades.this post is really amazing. thanks!
Both the WB-6250X and WB-5400 are not longer available. Could you recommend another camera, Please?. Thanks
should work with any cheapo camera really, my advice is to also stick away from using a dvd but instead use a proper LINEAR diffraction grating, they are cheaper but will give more accurate results, however if a diy type thing is what your going for than a dvd works just fine.
Can we measure absorbance from this ? Of a cuvette
Thank you.
I'll try making it after you.
And how can I get Theremino Spectrometer software?
Does anyone have an idea how you get the spectrum to go the whole width of the camera or do adjust it for that? I tried to make a different one but the the 'rainbow' is only on a narrow field of the camera and I can't get the software to compensate for it. It would seem like I have to put the camera far away from the grating in order to get it to widen out.
Same here :(
I noticed the CD reflective layer degrades over time. Amazon sells holographic gratings for cheap.
how did you get it to display in real time
does it work with a spectroscope? then use the camera to analysis the colour
webcam name?
thats a really really good visualization of additiv color right there 5:19
might be the best way to show it to someone, thanks for that =)
Can you test jade with this homemade setup?
Hi where to find optical spectrum analyzer in computer ?
Which software do you use to analyze
it's useful and amazing. But can I replace the camera by the onther one and can you suggest me another one?. All of you camera suggestion is no longer available :(
Can you make this for a test tube so I can build one for analysys. Have a drop down slot and mount a light inside with a mirror. Spectrometers are used for chemical analysis reading light sources is pretty useless.
Not really useless, these are great for testing filters for photography, UV and IR pass as why I'm here. Need something better than putting a broken dvd in front of my lens filter, which works, but need something more accurate.
Which camera is used i this project any model
You can use any camera, but it's recommended to use an old one, and one that is easy to take out.
Please share me your exact measurements for that. Thank you.
Awesome video! Do you mind me embedding this video on my physics website for Dutch students?
Great video, thanks for sharing. Would be great to see if there's enough spectral resolution to detect absorbance in chlorophyll ( from garden grass ) used in photosynthesis.
I’m thinking about making one of these but using vantablack paint on the inside of the box it should give more accurate if not close reading to the machines that cost $2500 haha
Can you use it as an... SDR?
Have you taken into account the quantum efficiency of your webcam?
very intersting thank you Mr. Egger
How to get absorbance -wavelength curve for a cuvette
Thank you so much for this video! Amazing job!
lmao, Im trying to up my light game for plants and I see your comment here. I just got a PAR meter and i wanna have a way of seeing the spectrum as well without dropping 1,000 dollars on some commercial one
What about painting it vantablack?
Even better, but of course, he doesn't have that.
@@Shonade_Malik I thought so I did watch a video on it crazy stuff 🤯 it's the closest thing to non reflective I know of apart from a black hole but part of me doesn't want to potentially turn into spaghetti for an extra 0.04% efficiency 😂
@@tinkertom3683 XD. Even shining a normal light at it does nothing.
What is that software for analysis of the spectrum
This looks like such an easy way to make a spectrometer, especially for 9th graders like me! Unfortunately I don't think you explained on how to connect the spectrometer to the webcam.
Hello, great video. Why do we need to remove the IR filter when analyzing the remote when we were able to view IR readings with the incandescent bulb? Is it because the lightbulb's IR portion is closer to the visible spectrum?
he already removed it, i think he was just reiterating that you need to remove them
Look...i ve been trying to make it work but i just cant...the problem is that the line is very thick and cant distingusidh colors...can you give me more details?
Nice video. Do you have the link for the free Theremino spectrometer software you are using. Apparently Theremino does not give out the link at their site.
I am interested to test
Whether a stone a.k.a a mineral contains iron or copper or aluminium..
After calibrating the LED light using the software..
Can it measure the absorbance and transmittant required for interpretation of substances that exist in that stone (mineral)?
If you make it very hot like putting the rock powder in a flame.
keen... ordering cam now
What about removing the IR filter on the camera? I heard that from multiple sources.
That's in the video!
Thank you for comparing the spectrumof white lamps, especially white LED and RGB-"white"-LED. I always had a feeling that this light is awkward for some reason.
Does anyone know the dimensions of the box and if they matter? Help would be appreciated
My CD is not transparent, what should I do
Those lamps should give sharp emission, instead in your spectra are band. You should reduce the slit size with razors.
Great video! Question: are those peaks a measurement of transmittance or something alike?
The detection amount depends on the sensors. You can calibrate this with a source of known ratios, ideally a flat spectrum although that's not exactly possible. A more accurate option would be to figure out what frequency curve is emitted at what temperature and use that. It's material independent and was the birth of quantum physics is all I remember
I am going to build it up myself, I just would like to ask 2 questions: 1. why the camera has to be installed at 30 degrees angle? 2. Is it necessary to use empty CD? are readings going to be distorted when using CD with something recorded on it? Many thanks!
I suspect the angle is to allow the grating to split the light at different locations of the camera’s sensor. If you look at a CD, you see the rainbow only for light coming at some angle, not for straight light. Also, if you put the camera straight, there will be too much light and the camera sensor may saturate.
Why it needs to be empty dvd m curious
The written DVD is full of holes and the precious light will escape.
wich is te lowest wavelength it can detects??
How can you measure UV light through the glass???
I have a big problem. I want to find the light spectrum emitted by human hand. Is it possible ? Please explain. I am very ill and dependent of radiation emitted by other human hands, which give me a lot of health benefits.I want to make a device with LED in order to replace human hand radiation. I really need of help.
Hello, this video was very very interesting, I want to build one too. Did you build a flame spectrometer too?
Great instructional video!
However, Infra-red energy is not 'wasted'. We need deep reds, near IR and IR light in the morning to produce elevated levels of mitochondrial ATP (literally our life energy) and also prepare ourselves for exposure to mid-day UV.
Then again in the early evening we need it to repair damage caused by UV and to also switch from serotonin production to melatonin production.
So... LED and fluorescent lights that lack deep red, near IR and IR combined with our indoors life style are detrimental to our physical and mental health.
Incandescent light bulbs are the closest we can get to our ancestral life style of sitting around the campfire before sleep. And in a properly insulated house in the cooler months, their 'wasted energy' means our heating system works 60-100 watts less per light bulb used. So the argument that they are not good for the environment is complete bunk.
Whose environment is it anyway? Because LEDs and fluorescent lights aren't good for OUR environment, and that's before even talking about the Mercury used in CFLs.
Hello, I agree it is not wasted in the cooler months, but in summer it is one more heat source. The light bulb I think it ok for the environment, the problem is how the electricity generated for all those bulbs... if it is burning coal then it is not good for the environment, and it's a waste if it's already hot in the house, and it is even more waste if you use air conditioning. But in the cooler months it ok, and even good, because you get all the benefits of a lightbulb, and it is especially reasonable if you need heating anyway.
Health benefits are of course is one more reason to consider.
Hi Sir,
glad to see this video regarding spectrum,
Explanation super and UI is too good(For UI which software is best Please suggest me sir )
Thank you so much. Best diy video
Where can I get the Theremino software?
How deep into the UV spectrum can it see? And is it camera dependent?
It is limited by the type of glass or plastic used for the lenses. Most common glass will absorb almost all UVB and UVC and a portion of UVA. Pure quartz glass is used for most UV transmission, including UV sanitation bulbs.
is it possible to get Light Density using this experiment ?
Hi, Good one, can we analyse UVC range (100- 290 nm) with this software? Please let me know. thanks
as long as your sensor is sensitive to UVC and your focusing optics dont block UVC it should work, though from what ive read you'll have a hard time detecting stuff closer to the 100nm range with a stock CMOS sensor
Usually UVC is not detectable by common CMOS sensors. While the silicon photodiodes of the CMOS sensors should in theory be able to detect UVC photons, there are some other limitations which make it impossible to detect anything below ~300nm.
Most CMOS sensors use a so called Bayer pattern filter with red, green and blue color filters and ontop of the filters are also microlenses which help to focus the photons onto the photodiodes. Those color filters and also the microlenses are somewhat opaque to the lower portion of the UVA spectrum, as well as the UVB spectrum and are usually fully opaque to UVC, meaning that below more or less 300nm, no useful amount of photons reach the photodiodes.
You would need a special CMOS sensor, designed for deep UV imagery (without a Bayer color filter array and without microlenses or with microlenses that are transparent for UVC) to be able to detect UVC.
Nice video, thanks for making it !
Spectrum of incadescent bulb looks quite different, so it is not accurate at all.
why do you need 2 stable peaks?
Wow.
fantastic explanation.
Thank you.
Can I use iPhone's camera to replace this webcam? Can this be used as a NIR spectroscopy to identify chemical compounds?
Hi, Using iPhone instead of a webcam in my opinion is not a good idea. First of all, you will not be able to remove IR filter from it, and second, you probably will have problems connecting it. Removing a camera from an iPhone also will not work. I don't know about NIR spectroscopy, I only can say that this device is limited in IR spectrum, the longest wavelength it can pick up is probably about 1100 nm.
@@ElectricalPro Thanks bro. Have you tested the range of this webcam you were using - does it go below 250nm into UV-B/C range? In you video, it went below 350nm to somewhere 310nm.
I have only one UV source, it is 383 nm, you can see it at 4:24, I don't have anything with a shorter wavelength. At 3:25 you can see some ripples from about 310nm to 400nm, but it is just noise, not UV.
4:48 This can't be correct. Why is there a huge dip in the red?
is the analyzer safe to download?
Very cool indeed, great work !
What will happen if I make it without diffraction grating. It seems to make no sense cuz CCD still accepted all color light signals although we used grating splited the light to rainbow.
It will not work without diffraction grating or something similar. Diffraction grating makes different colors of light fall at different places at the CCD. Basically, this device analyzes rainbow, and the rainbow will be different from different sources of light. Try to make a rainbow from a red and blue light... it will not be possible, you will still just get two colors, but they will be separated in space and that is the key, looking where that light is you can say what color it is even if you colorblind, or in the case of this device it will still work fine with Black-and-white camera.
I hope it helps.
@@ElectricalPro Thanks for your reply. I see, so the key is that webcam cannot distinguish if color from pure color or mixed color by primarily colors. For example, If webcam sees yellow, without the help of diffraction grating, it fails to know whether it is pure color around 570 nm or mixed color by red color light and green color. Am I right? Thanks again
Yes, you are absolutely right.
@@ElectricalPro Thanks a lot. Last question: I down the software and use it, but I cannot export txt file of spectrum. Hence I don't know the vertical value(Intensity of light). Are there any ways to deal with it?
As far as I remember there is no such feature... but I may be wrong, I am not the creator of that software. In any case the intensity will be relative not absolute value because the camera adapts to brightness of light.
Very interesting video. THANKS !
Awesome thanks for sharing man!