1083nm filter for He-I imaging?

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Cschur
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1083nm filter for He-I imaging?

Post by Cschur » Tue Jul 09, 2013 4:26 pm

Mauna Loa solar observatory always posts these killer full disk shots with one of these, but does not say much else.

http://mlso.hao.ucar.edu/index.php


Now I next went to Omega optical filters on line, and found they do have a 1080nm filter, looks pretty broad however at around 180nm band pass. Anybody do research on this? I know that my ST10xme has just enough bandpass to image at this wave band, but I suspect it may take an ultra expensive 1nm filter. Any thoughts?
Chris Schur

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Birch Mesa Observatory, Payson Arizona

Clear Creek Canyon Observatory, Happy Jack, Arizona

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swisswalter
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Re: 1083nm filter for He-I imaging?

Post by swisswalter » Tue Jul 09, 2013 5:21 pm

Hi Chris

thanks for the information. I'm always looking for new filters, at the Moment I'm on the short side of the recordable wavelength with our means ;)
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Re: 1083nm filter for He-I imaging?

Post by marktownley » Tue Jul 09, 2013 5:25 pm

I think an ultra expensive one will be needed - they talk about it being a Lyott filter on their website, they aint cheap!
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Re: 1083nm filter for He-I imaging?

Post by brianb11213 » Tue Jul 09, 2013 6:02 pm

Another major issue here: the sensitivity of the silicon based sensors that most of us use is practically zero at 1083 nm ... so it would need a special camera as well. Spherochromaticism in our "visual" instruments is going to be a serious issue but lack of useful response from the sensor is probably going to be many times worse.

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Re: 1083nm filter for He-I imaging?

Post by Cschur » Tue Jul 09, 2013 6:12 pm

Well, so much for that idea! :(
Chris Schur

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Clear Creek Canyon Observatory, Happy Jack, Arizona

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Re: 1083nm filter for He-I imaging?

Post by BelOptik_Oliver » Tue Jul 09, 2013 8:42 pm

Hi sunbathers :)

The "ChroTel" near VTT (Tenerife) use also three ultra narrowband Lyot filters and one of this is tunable.

http://www.kis.uni-freiburg.de/index.php?id=457&L=1

And here is description of filter and assembly:
http://instruments.hao.ucar.edu/ChroTel ... iption.pdf

Btw, Andover Corp. had in past times on his surplus filter side a NIR filter 0.5nm FWHM (too far) @1083nm offered for 620US$.
Clear skies! Oliver



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