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Re: (meteorobs) Night Vision Goggles

Kim,

I think you are right about where to find these sorts of tubes, but as 
far as the heat is concerned, I think you are getting confused with 
infra red goggles.

'Night vision' goggles are essentially 2 image intensifier / 
photo-multiplier tubes coupled together.  When a photon hits the 
photo-cathode at the end of the tubes, a shower of electrons is produced 
and accelerated towards a phosphorescent screen at or near an electode 
at a positive potential difference. When they hit the screen, they 
produce a much brighter visible image.  Infra-red goggles presumably 
work on a similar principle, but perhaps the photo-cathode involved is 
more sensitive to infra-red wavelengths than visible.  I'm not sure how 
this would work.


I would assume that these goggles would amplify all the sky glow as 
well, similar to the way a radio receiver amplifies all the interference 
as well as the signal you are trying to detect.  Perhaps they can be 
fitted with ligh pollution filters similar to those used in deep sky 
observing.

Clear skies regardless,
Paul.

  >
>
>Hi !!
>
>> where would one find these night goggles?
>
>I would tend to think you could get these at hunting/sports stores or 
>army supply stores.
>
>But I may have missed the thread, if so, bare with me.
>
>To use the night vision goggles, there would have to be heat involved 
>in order to see the meteor correct? Or am I thinking of infra red 
>goggles.
>
>What would the only advantage be, less stray light? Would you 
>actually pick up more meteors since the stray light is cut down?
>
>Do these glasses not cut off some of your peripheral vision? 
>
>Kim
>
> 
>***************************************************
>Moonlight Cascade Observatory/BBS
>44.28.28.9N 76.29.45.9W
>Astronomy-RASC,SARA,ALPO/AAVSO-Solar Section
>NAMN-Meteor Observing,Ham Radio-VA3KDH
>***************************************************                        
>


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