Recording into the far IR???

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Ken Harrison
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Recording into the far IR???

Post by Ken Harrison »

I'm testing some solar filters and would like, if possible, to get details of the possible transmission above>1100nm.
All the cameras I have show QE graphs which "die" above 1100nm.
Is there anything which would record beyond that???
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
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Andrew Smith
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Joined: Fri Sep 30, 2011 12:23 pm

Re: Recording into the far IR???

Post by Andrew Smith »

Ken - If I rember correctly (and it is a very long time ago) the band gap of Si is too wide for these low energy photo to excite photo electrons. This puts you into the use of Ge, PbSe or InSb which are specialist and I suspect expensive (see here http://www.pacer.co.uk/products/lasers- ... tAodH2kAnA ).

Regards Andrew
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Ken Harrison
Posts: 197
Joined: Thu Oct 25, 2012 5:45 am
Location: St Leonards, Australia
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Contact Ken Harrison

Re: Recording into the far IR???

Post by Ken Harrison »

Thanks Andrew. Yes, that seems to be the case, Howell gives some interesting insights....
Seems that "conventional" CCD's are restricted to +/- 1100nm.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before....
"Imaging Sunlight - Using a digital Spectroheliograph" - Springer
http://www.astronomicalspectroscopy.com
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