Yea, I think what I learnt in CPF is that for every doubling of distance, the power drops by a factor of 4 approx. Say for 8mW at 6 inches, that'd be 2mW at 12 inches, 0.5mW at 24 inches. Our 0.39cm^2 pupils are 6X bigger than 15mm x 15mm, so we'll take it as 0.08mW.
Can InfinitusEquitas measure the reflective power from say a glossy laminate, or say the refrigerator, glossy acrylic cabinets? Polished Marble/Granite slabs (kitchen tops), or semi-glossy homogeneous floor tiles? Transparent windows reflect a lot back as well. Anodized aluminum say from cooker gas hob? I have all those in my house.
Even a harmless plastic AC switch/socket might reflect quite a lot. Or from the airconditioner's ABS plastic. In effect if you really wanna be safe in the house, the laser needs to be "static". ie as what i've said earlier : don't wave it around in the house without glasses.
The pupil size vs LPM sensor size is definitely valid. But not sure if the pupil size really constricts as much. Coz my experience is that having a 1W laser focused perfectly to an optimal spot does not constrict the pupil much as compared to say a 10W XM-L LED with relatively much much bigger hotspot. I mean you do not lose your low-light vision as much. (because i play with my stuff often at night, always look out to look at the buildings etc. ).
I read through the wikipedia article. Regarding the MPE or Maximum Permissible Exposure, there is another graph which I do not understand.
Anyway this warning in the article sums it best.
- Watches and other jewelry that might enter the optical plane should not be allowed in the laboratory. All non-optical objects that are close to the optical plane should have a matte finish in order to prevent specular reflections.
A girl's polished/manicured nails, or false nails with crystals on it, may be the last things that particular eye ever see.
Can InfinitusEquitas measure the reflective power from say a glossy laminate, or say the refrigerator, glossy acrylic cabinets? Polished Marble/Granite slabs (kitchen tops), or semi-glossy homogeneous floor tiles? Transparent windows reflect a lot back as well. Anodized aluminum say from cooker gas hob? I have all those in my house.
Even a harmless plastic AC switch/socket might reflect quite a lot. Or from the airconditioner's ABS plastic. In effect if you really wanna be safe in the house, the laser needs to be "static". ie as what i've said earlier : don't wave it around in the house without glasses.
The pupil size vs LPM sensor size is definitely valid. But not sure if the pupil size really constricts as much. Coz my experience is that having a 1W laser focused perfectly to an optimal spot does not constrict the pupil much as compared to say a 10W XM-L LED with relatively much much bigger hotspot. I mean you do not lose your low-light vision as much. (because i play with my stuff often at night, always look out to look at the buildings etc.
). I read through the wikipedia article. Regarding the MPE or Maximum Permissible Exposure, there is another graph which I do not understand.
Anyway this warning in the article sums it best.
- Watches and other jewelry that might enter the optical plane should not be allowed in the laboratory. All non-optical objects that are close to the optical plane should have a matte finish in order to prevent specular reflections.
A girl's polished/manicured nails, or false nails with crystals on it, may be the last things that particular eye ever see.
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