4 ms·
Figure 5 shows J/cm2 vs mortality rate. Max mortality appear around 10 J/cm2 I found a paper that shows human eye damage occuring 50% of time at 200 J/cm2, at
by throwaway189262 6y ago
Figure 5 shows J/cm2 vs mortality rate. Max mortality appear around 10 J/cm2
I found a paper that shows human eye damage occuring 50% of time at 200 J/cm2, at least at blue wavelength
https://pubmed.ncbi.nlm.nih.gov/26359809/ https://pubmed.ncbi.nlm.nih.gov/26359809/
10 J/cm2 may be an adequate safety margin especially in near IR ranges where absorbtion occurs less in vulnerable inner eye structures.
There will definitely need to be some fail-safes to prevent beam from irridating one spot for more than necessary. Either beam movement or pulse length limits, or both.
Unrelated, I'm not sure why they need cameras. You already have a moving laser, couldn't you just scan the volume with it looking for insect wing beat reflections?
- sleavey 6y agoI guess you'd also need to look at possibilities that the laser light with the "safe" energy density of 10 J/cm² can't get focused by accident, e.g. by glasses or windows and whatnot, giving a higher and therefore potentially eye-damaging energy density. > Unrelated, I'm not sure why they need cameras. Machine vision stuff expects a pixel map as input. You'd have to implement some quick raster scanning step to build that, but I guess in principle it would be possible.
- throwaway189262 6y agoYeah, laser safe with optics is a real concern. Again IR might be useful here, for some frequencies only exotic materials are transparent like quartz, salt, transparent aluminum. Using the lasers you could measure insect wing beat frequency to avoid killing non target insects. I believe I read that in an older paper about insect laser fences, maybe these authors ignored it because it's patented