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> Humans cannot perceive infrared light due to the physical thermodynamic properties of photon-detecting opsins. Seeing near-NIR without pointing a laser at yo
by mncharity 1y ago
> Humans cannot perceive infrared light due to the physical thermodynamic properties of photon-detecting opsins.
Seeing near-NIR without pointing a laser at your eye is interesting, but "cannot perceive"?
It's dim, yes. But there are perception reports well beyond 1000 nm (like 1.3 or 1.5 um). People see NIR ophthalmoscopes. I fuzzily recall a DIY attempt to wear a NIR bandpass filter, to make bright day into dark-adapted near-NIR night. And two-photon sensitivity[1] can level off the single-photon sensitivity log curve above 900 nm.
[1] https://www.sciencedirect.com/science/article/pii/S0042698924000488 https://www.sciencedirect.com/science/article/pii/S004269892...
- Calwestjobs 1y agothis can be used in future by car drivers. illuminating road in front by IR light, which is invisible to ordinary human, so you do not disturb people, animals with visible light of headlights or it can be made into display, you project IR image onto contact lenses, which converts that into visible light. if particle size is small enough. im not sure about "efficiency" of such lens, we would need more watts to display something on this lens than we would need to project direct to eye. so im not sure if that difference is big enough to not be suitable for wearables or not.
- precommunicator 1y agoThat's kind of already a thing in cars: https://en.m.wikipedia.org/wiki/Automotive_night_vision https://en.m.wikipedia.org/wiki/Automotive_night_vision