_woods wrote:Pydpiper wrote:Here is another thought, no animal is going to react cosmetically to a black light, or a flash of the same wavelength.
But, urine will.
If animal peed, then walked through it, as they often do, urine would be on its underside, and urine can glow under UV lighting, much like that picture.
My guess, UV flash and a luminesent liquid, likely urine.
Infrared camera. Other end of the spectrum.
In advanced forms of light, you are right. But in the inexpensive LEDs used for this camera, and typical IR wavelengths the similarities will show as much the same in this application.
A useless but entertaining fact..
You can not see UV (effective wavelengths) or IR with the naked eye. Both different waves of light, but sharing similar characteristics.
If you look in the end of a remote control, like a TV remote, you can not see the LEDs flash as they transmit. (IR)
However, a video camera will pick that out with ease. Use your phone set to "video" or and video camera, and look at the LEDs as you push buttons, they light up like a flashlight, typically strobing. Easy way to see if a remote is working or not.
You do not have to record, just view the LEDs through the camera.
This also works on UV flashes, in the real UV world we can not see that wavelength, at all, but the inexpensive UV LEDs we see on cameras are simply standard LEDs with a phosphorus coating. Very different frequencies, but sharing some similar properties.
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