Triboluminescence of Life Saver Candy
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- Опубліковано 13 січ 2024
- Triboluminescence, simply put, is the emission of light when a material is mechanically broken. We are generally unfamiliar with this process because when it happens, it occurs extremely fast. A popular example, shown in the video below, is when a Life Saver candy is chewed, ground, or hammered. The fracturing of the candy emits blue light, but despite the clear characterization, this phenomenon is not perfectly understood, and there continues to be no recognized theory that explains the complete physical process, a quandary that lingers in part due to the ultrashort timescales.* Authors of a relatively recent review,* they state that: "further development of this research field, at least three issues must be seriously considered: a deep understanding of the inherent mechanism, standard test methods, and an accurate structure-packing-performance relationship."
From the view of a high-speed imager, since this is a self-illuminating event, we only get a hand-full of emitted photons relative to the typical amount of scattered photons that permits humans (a cameras) to see the candy, even with respect to typical room lighting. Experiments were done with lights on, and no blue light is apparent at all. So its clear that these sorts of tests are tough (but possible!) with ultrahigh speed imaging & spectroscopy that demands relatively short integration periods at higher framing speeds. The key is to have a CMOS sensor with a low-read noise and great spectral responsivity in the visible region. One could also take a step further and investigate this with an image intensifier.
This experiment was done for high school students at High Point high school in New Jersey. The idea was inspired by Destin Sandlin's youtube page, Smarter Every Day, • LIFE SAVER LIGHTNING (... , where he did the same test with a mallet and pellet gun and phantom v2511
* Chem, Volume 4, Issue 5, 10 May 2018, Pages 943-971
Phantom VEO1310 at 1280x960, 8000 fps, 120 us exposure, 100 mm Zeiss Lens and ~3/4 inch extension. Images were also post-processed in Topaz. - Наука та технологія
Did you have to increase ISO/Gain a lot to see the effects? Or was it pretty visible with base sensitivity at the 120us exposure?
Yep, had to use the tone curve to remap all the pixel lower values to the upper values since all the image data was in the lower 10% of the pixel full well. This high speed video is indeed a bit grainy because of that, but it is the nature of characterizing high-speed low light events, its a super challenge to even get to this quality! Some scientific folks couple the camera with an intensifier to boost the SNR of these sorts of tests... those run upwards of 30k USD!
.... I will upload another video where the Life Saver is well lit, and you'll see a beautiful HS video, but no blue light!
This is very cool thanks
Now let’s see what it looks like in your mouth
careful what you recommend :)
That's awsome! I've always wanted to try it. Do you think it could be seen with 960fps?
Yea, but you’ll probably only get maybe 1 frame with blue cracks within that 960 fps
@@kdgilroy4 Okay, I'll try it someday and let you know if I see it. Thanks and keep up the awsome videos!
I tried it and its was able to be captured the glow at 960 fps! It was only 2 to 3 frames but it was still impressive. If you want to check it out, it's my most recent short I posted today.
@@munoz.isaac7505 really awesome work !!
@@kdgilroy4 Thank you!!