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[vsnet-chat 201] CCD UV-filter -Reply
- Date: Fri, 14 Mar 1997 18:57:20 +0200
- To: tkato@kusastro.kyoto-u.ac.jp, vsnet-chat@kusastro.kyoto-u.ac.jp
- From: Berto Monard <lagmonar@csir.co.za>
- Subject: [vsnet-chat 201] CCD UV-filter -Reply
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- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
>>> Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> 14/March/1997
05:14pm >>>
We are now designing a U-band filter for the Ouda CCD system.
A preliminary search failed to find a suitable prescribed product.
What solutions do readers recommend? Further we have a
U-band filter
for photomultipliers, but this has an appreciable leak in the red
end.
Is there any inexpensive (commercial) filter to cut this
unneccesary IR
transmission?
Regards,
Taichi Kato
//
It is easy to get rid of the shorter wavelenghts by means of cut-on
filters. To cut out the longer wavelengths will always be at a cost
to the short (those you want) wavelenghts.
If a U filter stands for UV filter, I wonder why the Ouda team
wants to use it in front of a CCD.
For the efficient detection of the available photons and to
minimize interference from radiation at other wavelenghts it is
better to combine CCDs with V, R and NIR filters and PMTs with
V, B and U filters.
I wonder if this is a feasible option for the Ouda team?
Regards,
Berto Monard
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