Photoelectric Sensor Explained (with Practical Examples)
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- Опубліковано 4 сер 2024
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▶ Check out the full blog post over at
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⌚Timestamps:
00:00 - Intro
00:27 - Applications
01:08 - Working principle
01:22 - Types of photoelectric sensors
01:38 - 1) Through-beam
04:16 - 2) Retroreflective
05:36 - 3) Diffused
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In this video, we will be talking about the three main types of Photoelectric Sensors: Through-Beam, Retroreflective, and Diffused.
A Photoelectric Sensor is a device that uses light to detect the presence or absence of an object.
Photoelectric Sensors can be used in many different ways and industries. They can be used to detect objects or the orientation of an object on a production line, they can be used to count, and they can also be used to stop an automatic closing door.
Photoelectric Sensors are used in the automotive, food, transportation, and material handling industries to name a few.
They can be used to detect most materials like metal, plastic, and wood. They can even detect clear items like glass, plastic, and liquids depending on what type of sensor it is.
The basic operation of a Photoelectric Sensor is, the sensor sends out a light beam from the part of the sensor called the emitter, and this light beam travels to the part of the sensor that collects the light called the receiver.
1) Through-Beam sensors have the emitter and the receiver in their own separate component.
The emitter and receiver have to be pointed at each other and be aligned. When nothing is blocking the light, the output of the sensor will be on. If you put something between the emitter and receiver to block the light, the output of the sensor will turn off.
The sensor’s output is the signal from the sensor to the PLC. Depending on the sensor, the output can be a positive signal or a negative signal.
- If the sensor is PNP, meaning it has a positive output signal, the sensor’s output wire will have to be connected to a sinking input card.
- If the sensor is NPN the output signal is negative and the output wire will need to be connected to a sourcing input card.
Some Photoelectric Sensors have a light-on, dark-on mode selector switch. With this switch, you can change when the sensor’s output turns on and off.
- In light-on mode, the sensor’s output will be on when the light can reach the receiver, and off when the light is blocked and is not reaching the receiver.
- In the dark-on mode, the sensor’s output will be on when the light is being blocked and not reaching the receiver, and off when the light is reaching the receiver.
Through-Beam Photoelectric sensors have a longer detection range than Retroreflective and Diffused Photoelectric Sensors. This is because the light only has to travel in one direction to get from the emitter to the receiver.
Some disadvantages of using a Through-Beam sensor compared to using a Retroreflective or Diffused sensor are they cost a little more, require more room to mount correctly, and do not detect thin clear objects well.
2)Retroreflective Photoelectric Sensors have the emitter and receiver together in the same component. The sensor’s emitter needs to be pointed at a reflector and aligned, so the light travels from the sensor’s emitter to the reflector and then bounces back to the sensor’s receiver.
Some disadvantages of using a Retroreflective sensor are you have to install the sensor with a reflector, if the object is shiny, it might turn on the sensor’s output instead of the reflector.
3) Diffused Photoelectric Sensors have the emitter and receiver together in the same component.
For the Diffused sensor to work, the sensor’s emitter needs to be pointed at an object so the light travels from the sensor’s emitter to the object and then bounces back to the sensor’s receiver.
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This channel is really a treasure I found in youtube for instrumentation, simple animation with most clear explanation and easy to understand in one go, really awesome thanks a lot for this
Thank you very much! That's amazing to hear, we truly appreciate such support.
Happy learning!
This channel is a hidden gem. Great quality, informative, talks at a good speed (not too slow nor too fast), free.
Amazing! Glad to hear that, Alejandro. Thanks for sharing!
I work with all 3 types.
Excellent video Realpars team. You're doing really great work.
Much appreciated!
Excellent video. Simple, great graphics, to the point, and all bases covered. 11/10
Much appreciated!
You are the teacher for automation student's
Many thanks Realpars for this wonderful information
Glad it was helpful!
Very good ,Great quality , very helpful and valuable lecture
Glad it was helpful!
Great thanks to realpars, You guys are really doing a great.
Much appreciated!
I am following your channel from Long time your all video's are informative and way of expansion is very good.
Glad to hear that! Thanks a million for your kind comment.
Nice, thanks for classified all of the type photoelectrics sensor
You're very welcome, Thien!
Congrats. What a good channel. I prefer capacitive sensors over the diffuse sensors.
Thanks for your support, Ricardo!
Thank you very much Realpars
You're very welcome!
I have always seen useful videos published on this chanel .thank you
Glad to hear that, Basil!
Amazing explanation of Photoelectric sensor
Thanks a lot!
The easiest way u teach awesome
Nice explain
Thanks for this great video! I manage a supply chain for a packaging OEM and videos like this help me learn about our applications (aside from me bugging our engineers lol)
Glad it was helpful!
Woow good explanation realpars. I got lot of knowledge about these video series . keep it up. 💪♥️
Glad you like them!
nice, very relatable to my work as automation engineer 👏👏👏
Thank you, Kevin!
@@realpars big fan here, keep it up !
Very informative!!
Glad to hear that! Thanks for your support
Would you please provide a video on how to make "Teach in " retroreflective sensor for the printed films
Many thanks!!!!!!!
Our pleasure!
Thank you very much!
Our pleasure!
great video. thanks a lot.
You are welcome!
great channel, thanks for sharing
You're very welcome!
Very good video thank you sir
Thank you!
I would say well explained and clear.
Thank you, Anacleto!
Really helpful
Glad to hear that
Thanks a lot teacher.......i learn something new......i m really happy......again thank u so much
Glad to hear that, Atiq!
I work with all 3 and the most difficult one is the diffused one.
Excellent sir
Thank you, Raj!
Nice work
Thank you!
Awesome video more instrumentation videos
Thank you, Amin!
THANK YOU
Our pleasure, Jimmy!
I have worked in maintenance I don't know about these three types of PES thanks for the video
You're very welcome, Naresh!
perfect
Thanks
You're welcome!
Could I know how to connect 5 wire diffuse(E3JK-DS30M1 ) sensor to s7 1200 1214c AC/DC/rly digital input part.
Do you have any type of photoelectric sensors that you would recommend for the clear bottles (glass/plastic) ?
There are retro-reflexive sensors (Sick) and diffuse reflective sensors (Omron) that are made for this very purpose. Check with the manufacturer before purchasing to make sure the sensor is appropriate for your application.
Do these exist in scaled down versions?, just trying to use a photoelectric sensors for a project and was wonderingif you can find them in smaller sizes
Yes. They are traditionally called "miniature sensors." As an example, here is the catalog page for DigiKey photoelectric sensors. Enter "mini" into the "Search within results" bar at the top of the page. You will find a wide array of small sensors available. Other manufacturers have extensive catalogs as well. For any that you select, double check the specifications to insure it will meet your requirements for voltage, sensing distance, etc. Happy shopping!
thanks
You're very welcome!
How can we connect the retroreflective photoelectric sensor to a brushed DC motor? I want to use the light barriers for triggering DC motor.
If you mean starting/stopping a DC motor when an object passes through the retroreflective beam, then yes, but you will need to use a relay. A retroreflective sensor does not have a sufficient power rating to control a motor.
Video is very useful . can photoelectric sensors be used to measure the dimension like diameter and width of the object ? If yes what sotware and hardware needed
Hi there,
Thank you for your question! If engineered correctly, and you are using a PLC, you can. I mentioned again if engineered correctly, use a photocell to measure the width of a physical object, and you can use a photocell to make dimensional measurements of an object. Still, you will have to use a robot and, in some cases, more than one photocell. But there are better devices like camera imaging that are more cost-effective and used in the market.
Regarding the software, too many are out in the market that can do this for you. Too many to mention. But below are some links to 2 companies with lots of reading material for your learning experience.
www.keyence.com/products/sensor/photoelectric/
www.omega.com/en-us/
Happy learning!
hi, how can this type of sensors can detect materials such as metals, wood, plastic and etc. ? can I use this type of sensors for material recognition system ?
This is a popular question. There are many different types of sensors which can detect objects of different materials. A block of wood, a cardboard box and many plastics can be detected with a through-beam or retroreflective sensor. Glass, opaque plastic, and sheet film can use diffused sensors if the material significantly refracts the light beam. There some very sophisticated (and expensive) LED-based sensors that can differentiate between different types of plastic sheets (PET, LDPE, HDPE, PVDF, etc.).
Great content!, I would like to do some animated videos like these in spanish, can you tell me what is the program you use to animate please?, keep up the good work!!
Hi there,
Thanks for your comment and compliment! I am actually not sure about this, our animations are created by our Graphic and Animation department.
@@realpars I could try and transcribe to Spanish. I know Spanish/English and I work with SCADA.
Do Photoelectric work well outdoors in the rain / snow? Looking for a sensor (PIR, beam break etc) to watch a gate and trigger an output when cars drive through
Thank you for your question. Yes, they do work in different environments. These devices are made for outside and inside use. You must order the correct one for your application and environment. They are manufactured with an IP rating. I am including a RealPars UA-cam video for your review and for learning about IP ratings. I would suggest you contact your local vendor. Here are some links for your learning. There are many companies on the Internet you can choose from.
www.keyence.com/products/sensor/vision-sensor/
ua-cam.com/video/z935clBMJYU/v-deo.html
Happy learning!
Why doesnt retroreflective sensors beam bounce back from objects like diffused one does? Is the receiver not as sensitive?
Light from a shiny object certainly could bounce back to a retroreflective sensor, but most of the time, this type of detector is used for corrugated boxes, and other non-shiny surfaced objects. Another plus is the reflector bounces the emitted beam back to the receiver at an angle, so it is much less likely for a passing bottle or part to be able to reflect the light to the receiver at that same angle, giving a false signal.
❤️❤️
i wish i know this channel sooner
Happy that you are here now :)
makes me think of image/video sensors
Thank you very much, I use sensor Photo sensor with Reflector Type SICK
You're very welcome!
Please make video information for wiring diagram for diffused sensor
Thanks for your topic suggestion, I will happily go ahead and forward this to our course developers.
Perfecto
Thank you, Abiti!
Are there sensors that can read numbers from an electricity meter or a water meter and send the data to Arduino or a platform like ThingSpeak?
Thank you for reaching out. Certainly, there are sensors available that can read numerical data and transmit it in the required format, though they often come with a corresponding cost. It's important to note that the content we provide in our lessons primarily caters to the automation industry rather than hobbyist endeavors, in case that's what you're seeking. However, if you're interested in learning more about sensors and their functionalities, I recommend exploring this link to a prominent company in the field. It could offer valuable insights into sensor technologies and applications. www.keyence.com/products/
How long the through-beam sensor can be between emitter and receiver ?
Hi Mohammed,
The length of the sensor can differ based on the manufacturer and the intended application. To find specific details, I recommend referring to the data sheet of the through-beam sensor model you're considering for your application. Here are some links that provide information relevant to your needs. Keep in mind that the choice depends on the specific application.
www.keyence.com/products/sensor/
us.rs-online.com/view/search/?category=2%7c3882615%2f3886757
Enjoy your learning experience with RealPars!
Just wondering about the license requirements to download these videos for use in teaching electrical apprentices at a private company?
Hi Travis,
You can share/use our video as long as it remains unmodified, tagged and credited back to us. You can go ahead and embed our video in your teaching materials, but any modification or translation is not allowed.
Hope this helps! If you have any other questions or concerns, please feel free to reach out to us over at hello@realpars.com
Thanks. I really like the simple style and technical nature of your videos. I will make sure the video content is unaltered with a card giving Real pads credit for the production.
Stupid auto correct😁
Fantastic, terriffic!!!!!
Many thanks, Julio!
Sir, Which software you use to make this animation.
Thank you for your comment! I’m actually not sure about that; our animation and graphic department is responsible for the animations in the videos.
Can you make a video on LVDT?
Hi Dibya!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Can you make a video on color mark sensor
Thanks for your topic suggestion, Chitsimran! I will go ahead and pass your topic suggestion on to our course developers.
and infra red, LIDAR
what is difference lasser sensor and photoelectrical sensor ?
Great question! That would actually make for a great future course video, I have happily gone ahead and passed this on to our course developers.
Thanks for sharing and happy learning!
I Will be waiting the new video
hundreds of pages summarized in video of less than 10 min !
Thank you, Hermann! That's an amazing compliment!
@@realpars I have a question : For a sensor which output type is pnp, what is the range of it's output 24v signal ?
Every electric garage door has one.
Helo, i am your loyal audience from indonesia. Can you help us the one from indonesian to give me indonesian translate your video ? Thank you.
Hi Rahman,
Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Our apologies for any inconvenience!
Happy learning!
Great video👍 I would like to know which reflector can I use with the retroreflective sensor that can withstand high temperatures +-100℃
Here is one example: www.ifm.com/us/en/product/E21268. There are many others. Just search the web for "High Temperature Retroreflective" and you will get results from companies like IFM, Banner Engineering, VPEI, and other reputable automation companies.
am here, thank your visit me too, God bless you