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Author Topic: How does night vision work ?  (Read 3765 times)

Offline neilep

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How does night vision work ?
« on: 26/07/2005 20:54:13 »
I've got a neat night vision thingy on my camcorder wish is ace...I notice that there is a red light that I assume is projecting ahead and being picked up by some receiver through my lens eh ?

Can you please explain to me what it's all about ?..could it possibly be dangerous to look straight into this ' red ' light ?

Are all night vsion goggles etc based on the same principle ?

thanks

neil
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Offline simeonie

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Re: How does night vision work ?
« Reply #1 on: 26/07/2005 22:02:24 »
I think I know this one.

The "goggles" or whatever your using shines a light on something. Usually red and the goggles are tuned to pick it up. Are eyes can't see it reflect off stuff though but the lense on the camcorder or whatever your using is tuned to see it.

I think that is right.

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Offline daveshorts

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Re: How does night vision work ?
« Reply #2 on: 01/08/2005 19:27:15 »
I think that there are several generations of night vision goggles.

 I think some of the newer ones work with a very sensitive CCD camera (like the one in your camera), which is also sensitive to near infra-red light that you can not see - so you can illuminate things with infra red light that is invisible to the naked eye.

I guess that the older ones work like Geiger tubes - you have two plates seperated by a low pressure gas with a very high voltage between them. You then project dim light on one side which is coated in a substance that will release electrons easily - these electrons are accelerated by the voltage and hit a phospor on the other side which glows producing much more light than was originally produced.
 

Offline simeonie

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Re: How does night vision work ?
« Reply #3 on: 01/08/2005 20:28:48 »
So I was right then? At least about the newer ones

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Re: How does night vision work ?
« Reply #3 on: 01/08/2005 20:28:48 »

 

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