Infrared CCD
Mark Baier
(800-1000nm)? I understand that most CCD are somewhat sensitive in the
IR, but I wondered if any are optimized. Thanks.
Mark
Jack Penkethman
Mark Baier wrote in message <36901574...@ultranet.com>...
Try Cohu Electronics in San Diego http://www.cohu.com/cctv/index.html
They have a frame transger CCD camera that is sensitive down to I think
1100nm, which is where silicon cuts off.
Jack Penkethman
rnsh...@yahoo.com
remove the IR blocking filter glass, which is installed in many cameras to cut
down on the effects of chromatic aberration in the lens over the non-visual
range. If you happen to have a CCD camera that you can disassemble, just try
removing the glass window in front of the CCD and see what happens.
Some vendors can "optimize" the camera for IR by either coating the CCD with
an antireflection coating tuned for IR, or installing an IR
transmitting/visible blocking filter, but I don't think the improvement will
be significant.
In article <36901574...@ultranet.com>,
mba...@ultranet.com wrote:
> Does anyone know of a CCD/board camera that is optimized for IR
> (800-1000nm)? I understand that most CCD are somewhat sensitive in the
> IR, but I wondered if any are optimized. Thanks.
> Mark
>
>
--
Richard Shagam
Albuquerque, NM
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Louis Boyd
>
> Many CCD cameras will work in that range, provided that you or the vendor
> remove the IR blocking filter glass, which is installed in many cameras to cut
> down on the effects of chromatic aberration in the lens over the non-visual
> range. If you happen to have a CCD camera that you can disassemble, just try
> removing the glass window in front of the CCD and see what happens.
>
> Some vendors can "optimize" the camera for IR by either coating the CCD with
> an antireflection coating tuned for IR, or installing an IR
> transmitting/visible blocking filter, but I don't think the improvement will
> be significant.
>
> In article <36901574...@ultranet.com>,
> mba...@ultranet.com wrote:
> > Does anyone know of a CCD/board camera that is optimized for IR
> > (800-1000nm)? I understand that most CCD are somewhat sensitive in the
> > IR, but I wondered if any are optimized. Thanks.
> > Mark
If you're looking for a cheap camera get one that comes with IR
illuminating diodes.
You can unsolder one diode to shut the illumination off. They don't
have blocking filters. Many of the other cheap board cameras don't
either, but you have to check them. The filters cost money so the
cheapest cameras frequently work well in the IR. Unfortuantely the
mfgr's don't often give response curves.
Try
http://www.supercircuits.com for cheap cameras, some with IR
illuminators.
Lou Boyd
Don Stauffer
> snip
> You can unsolder one diode to shut the illumination off. They don't
> have blocking filters. Many of the other cheap board cameras don't
> either, but you have to check them. The filters cost money so the
> cheapest cameras frequently work well in the IR. Unfortuantely the
> mfgr's don't often give response curves.
>
> Try
> http://www.supercircuits.com for cheap cameras, some with IR
> illuminators.
>
> Lou Boyd
One can pretty well use the generic silicon photoresponse curve. There
isn't that much difference between most imaging chips as long as they
aren't filtered.
--
Don Stauffer in Minneapolis
home web site- http://home1.gte.net/stauffer/
home email- stau...@gte.net
work email- stau...@htc.honeywell.com
Gregory J. Whaley
have sensitivity in the near IR. Near IR penetrates past the CCD wells
and are not detected "well" (pun intended!) I know that Hamamatsu has
linear detector arrays which have nice sensitivities out to the 1 um
silicon limit. There are likely other 2D focal plane arrays which are
useful for scientific or astronomical applications might be available.
See http://www.site-inc.com/index.htm for more information.
- Greg
Mark Baier wrote:
>
> Does anyone know of a CCD/board camera that is optimized for IR
> (800-1000nm)? I understand that most CCD are somewhat sensitive in the
> IR, but I wondered if any are optimized. Thanks.
> Mark
--
------------------------------------------------------
Dr. Gregory J. Whaley mailto:gwh...@svta.com
SVT Associates, Inc. voice: 612.934.2100 x249
7620 Executive Drive fax: 612.934.2737
Eden Prairie, MN 55344
Jack Penkethman
rnsh...@yahoo.com wrote in message <76rkka$qqv$1...@nnrp1.dejanews.com>...
>Many CCD cameras will work in that range, provided that you or the vendor
>remove the IR blocking filter glass
Good point. And the idea of coating the cover glass for transmission in the
IR can increase sensitivity by 8% or so.
Just one further note. The reason I suggested the older frame transfer chips
is because they have a higher sensitivity - almost 100% sensitive area as
opposed to the newer line transfer CCDs. In addition, they are more
sensitive in the IR than line transfer chips due to their thicker CCD cell
structure which can absorb longer wavelengths. These cameras are still used
in surveillance applications where sensitivity in IR is desired.
The drawbacks may be cost and the substantial electronics that usually come
along with the camera. On the other hand, these cameras do typically come
with small compact remote heads.
Good luck,
Jack Penkethman
Mark Baier
Mark