> broken and smashed Flock cameras
I wonder how resistant the cameras are to strong handheld lasers. I suppose they could harden them against some common wavelengths with filters, but that'd affect the image clarity in normal use.
I wonder how resistant the cameras are to strong handheld lasers. I suppose they could harden them against some common wavelengths with filters, but that'd affect the image clarity in normal use.
I assume you're concerned about reflections from the camera lens or housing? In my mind, the archetypal camera is mounted on a nice tall pole, silhouetted against open sky, and painted matte black.
> watt class lasers
Surely those would be excessive for someone attacking the sensor, unless they want to remotely sear some graffiti by burning away paint.
Most of his work was dealing with and accounting for reflections that left the machine. If you have a prism that’s sending 95% of the light where you want it to go, when it’s a multi watt laser you can’t just let that 5% go wherever it wants. You will blind someone. So his job was getting black bodies in all the right spots to absorb the lost light.
His safety goggles looked like even more expensive Oakleys of that era and they were (much more expensive).
Please, don't play with lasers. At all. Even supposedly "safe" lasers can output far more light than expected.
How can one know what is dangerous for the eyes or not? Years ago I got an "IR illuminator" (from aliexpress, probably) that I wanted to use with my raspberrypi NoIR camera, for fun. Say filming myself during the night to see how much I move while sleeping, or making my own wildlife camera trap.
But I was scared that it could be dangerous and never used it (I tested it in an empty room, but that was it).
Is there a safe way for a hobbyist to get an IR illuminator and be sure that I won't make somebody blind with it?
If it's a cluster of garden variety through-hole LEDs with domed tops (like you would see on a TV remote), they're necessarily low power on account of having poor thermal performance.
Another way to tell is if nothing gets warm at all. It's pretty hard to hurt someone with an emitter that both doesn't have a focusing optic and doesn't get warm.
Let me be clear - you're still responsible for verifying the safety of your stuff, and I am in no way assuring you that the device you have is benign, because I can't do that without inspecting it directly.
> Let me be clear - you're still responsible for verifying the safety of your stuff
Obviously yeah. I was just wondering if there were known rules like "these wavelengths under this power are fine for humans and wildlife, even if they put the LEDs right in front of their eyes", and also if you have an array of such IR LEDs, how they cumulate.
And curious about things like: if I don't see it, can it hurt my retina?
I probably will never do it: I wouldn't want to blind a fox just because I wanted to make my own wildlife camera :).
I think it would be a cool exercise to figure out how much optical power you would see at, idk, 5cm from your illuminator. I assume it's a shortwave IR close to visible light, so you can assume it will focus like visible light, more or less.
Ideally you'd use an optical power meter but you could get a first pass by looking at the circuit and seeing how many mW pass through each LED, applying a conservatively high efficiency factor of W_optical/W_electrical, projecting that into a radiated cone for each LED and multiplying the power received on a dilated pupil sized spot at 5cm by the number of emitters.
Then you have to work out what the irradiance at the retina is once the light is focused. The hazard criteria include a time factor, so you'll have to decide if you/foxes would like to stare directly into the beam for 10 seconds? Or for the entire duration of your meditation session.
I assume CCTV surveillance cameras are usually fine because people cannot go and stare at it from very close then :-).
This is a nerd fantasy thing, but it's a really bad idea. It's hard to hit a tiny lens from a distance and it only takes one slip of the hand to shine it straight into traffic or someone walking down the sidewalk.
https://www.cehrp.org/dissection-of-flock-safety-camera/
https://www.arducam.com/product/arducam-ov5647-noir-camera-b...