Other
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7439e..28l&link_type=abstract
Astronomical and Space Optical Systems. Edited by Warren, Penny G.; Marshall, Cheryl J.; Tyson, Robert K.; Lloyd-Hart, Michael;
Other
Scientific paper
A practical method for introducing stray light for testing the James Webb Space Telescope (JWST) at cryogenic temperatures using hollow shell spherical reflectors is described. Several alternate approaches to stray light testing are compared, including fiber sources, diffuse panels, and curved specular reflectors. Alignment of the sources can pose special difficulties when cooling to cryogenic temperatures, since the shape of the reflector, mounts, and support structure can all change. The hollow shell spherical reflectors do not have any of these difficulties, and can be mounted so that they are automatically aligned by gravity. This also makes them insensitive to vibration, so they can be used with long detector integration times to provide adequate stray light signal to noise without interfering with other optical tests. The reflectors are positioned so as to work with test source(s) already in the cryo-vac chamber. The spherical reflectors operate at all wavelengths, reducing the number of reflectors required and providing operational flexibility in reflector placement. Electroplated stainless steel hollow shell reflectors are inherently compatible with cryogenic and vacuum environments. The reflectors are passive and have no thermal dissipation, eliminating impact on sensitive thermal tests. Their light weight and single point suspension mounting minimize the dynamic and static loads. Finally, the reflector's simple geometry is inherently compatible with optical alignment metrology (e.g. LIDAR), making position measurements both more accurate and simpler to document.
No associations
LandOfFree
Cryogenic stray light testing of the James Webb Space Telescope: an easy approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cryogenic stray light testing of the James Webb Space Telescope: an easy approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cryogenic stray light testing of the James Webb Space Telescope: an easy approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1303695