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Posted: 12/3/2018 9:44:07 AM EDT
[#1]
Quoted:
I was wondering if temperature has any effect on nvg tube's ? Recently I was at the cabin with my pvs-14 gsci version, and it would seem that the colder it got, the better it worked..or could this just be my imagination ? https://www.youtube.com/watch?v=tjNTtvK6_tk ever since I got my 14 from TNVC in cold weather especially when I turn it on and set the gain a few seconds after it being on it flickers a little. after 3-4 minutes once its been running the adjustment is smooth. For me this is more pronounced in cold weather and takes a few minutes longer. but overall performance seems to be the same regardless of summer/winter |
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Posted: 12/3/2018 10:12:14 AM EDT
[#2]
as the tube gets colder, the ebi current drops, so there is less apparent noise interfering with viewing
affects of temp on ebi  Affect of temperature on Image Intensifier EBI Night Vision Dark Current how the level of light illuminating something has to be above the ebi, for things to be visualized  Night Vision EBI Image Intensifier Dark Current thanks to past member for creating videos |
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Posted: 12/3/2018 10:33:50 PM EDT
[#3]
Quoted:
I was wondering if temperature has any effect on nvg tube's ? |
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Posted: 12/4/2018 6:20:39 AM EDT
[#4]
Really interesting video's, thanks for sharing ! So in theory..if you put the pvs-14 in the fridge, and use it afterward, one would have a clearer image ?
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Posted: 12/4/2018 9:35:42 AM EDT
[#5]
Yes, but putting NODs in the fridge and then bringing them out into normal temperature and humid air results in fogging lenses.
Though, if you purge them and wrap them in cling wrap, you might prevent that. |
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Posted: 12/6/2018 5:42:15 PM EDT
[#6]
Quote HistoryQuoted:
Yes, but putting NODs in the fridge and then bringing them out into normal temperature and humid air results in fogging lenses. Though, if you purge them and wrap them in cling wrap, you might prevent that. Edit: Ahhh Yes. http://www.freepatentsonline.com/3751709.pdf |
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Posted: 12/7/2018 12:02:10 AM EDT
[#7]
Quote HistoryQuoted: I wonder if anyone has ever tried to cool a tube with a peltier module in a NVD. Edit: Ahhh Yes. http://www.freepatentsonline.com/3751709.pdf Photomultipliers (great grandfather of image intensifiers) are pretty routinely cooled in a variety of scientific applications. Depending on the photocathode, dark current (EBI) can decrease by a factor of two for every ~3C. Benefits can compound pretty quick. Want to say I've seen temps as low as -80C for cooled photomultipliers. |
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Posted: 12/7/2018 8:21:55 AM EDT
[#8]
Quote HistoryQuoted: That's a slick arrangement. Photomultipliers (great grandfather of image intensifiers) are pretty routinely cooled in a variety of scientific applications. Depending on the photocathode, dark current (EBI) can decrease by a factor of two for every ~3C. Benefits can compound pretty quick. Want to say I've seen temps as low as -80C for cooled photomultipliers. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. |
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Posted: 12/7/2018 9:24:19 AM EDT
[#9]
Quote HistoryQuoted:
Image Intensifier tubes: Concept, 1928, First working 1934, Netherlands. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. Quote HistoryQuoted:
Quoted: That's a slick arrangement. Photomultipliers (great grandfather of image intensifiers) are pretty routinely cooled in a variety of scientific applications. Depending on the photocathode, dark current (EBI) can decrease by a factor of two for every ~3C. Benefits can compound pretty quick. Want to say I've seen temps as low as -80C for cooled photomultipliers. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. |
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Posted: 12/7/2018 11:41:03 PM EDT
[#10]
Quote HistoryQuoted:
Image Intensifier tubes: Concept, 1928, First working 1934, Netherlands. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. |
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Posted: 12/8/2018 12:31:45 AM EDT
[#11]
Quote HistoryQuoted:
Image Intensifier tubes: Concept, 1928, First working 1934, Netherlands. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. Quote HistoryQuoted:
Quoted: That's a slick arrangement. Photomultipliers (great grandfather of image intensifiers) are pretty routinely cooled in a variety of scientific applications. Depending on the photocathode, dark current (EBI) can decrease by a factor of two for every ~3C. Benefits can compound pretty quick. Want to say I've seen temps as low as -80C for cooled photomultipliers. Photomultipliers: Concept 1930, First working, 1934, Russia. I don't think this quite qualifies as "great grandfather"... :) David. |
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