NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Night Vision Scopes
From: Charles Seitz
Date: 2005 Jun 29, 21:19 -0400
From: Charles Seitz
Date: 2005 Jun 29, 21:19 -0400
I have some experience with night vision light amplification devices. We had a dark tunnel at Frankford Arsenal (Phila, PA) to evaluate them. The 1st generation devices such as the Starlight Scope lacked resolution but did indeed provide some enhanced night vision capability. I wasn't favorably impressed. The latest devices are quite spectacular; pilots actually use them for night flying. These devices have a array photosensitive cells that emit electrons in response to impinging photons. A high voltage field accelerates the freed electrons onto a phosphorescent screen where the image appears. An amateur astronomer friend, who works with night vision technology, signed out a third generation night scope to observe a comet. Looking through the scope, the comet tail extended accross the sky and many higher magnitude stars were visible. If I recall properly, the brighter stars were blured and didn't appear as point sources. You might be able to conduct night sights because the horizon will be visible if the device is placed in its direct optical path. The image will be somewhat granular and there will also be some bright speckles. So you would need to ignore these distractions to estimate where your star is. --- CHAS