Computer Science – Performance
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5495..622h&link_type=abstract
Astronomical Structures and Mechanisms Technology. Edited by Antebi, Joseph; Lemke, Dietrich. Proceedings of the SPIE, Volume 54
Computer Science
Performance
Scientific paper
We present case studies on the application of passive compensation in two large astronomical instruments: the Gemini Near Infrared Spectrograph (GNIRS), including actual performance, and the NOAO Extremely Wide Field Infrared Mosaic (NEWFIRM) camera. Image motion due to gravity flexure is a problem in large astronomical instruments. We present solutions for two different cases using passive mechanical compensation of the optical train. For the Gemini Near Infrared Spectrograph (GNIRS), articulation of a single sensitive optic is used. Adjustable cantilevered weights, designed to respond to specific gravity components, are employed to drive tilt flexures connected to the collimator mirror. An additional requirement is that cryocooler vibration must not dynamically excite this mirror. Performance testing of the complete instrument shows that image motion has been satisfactorily compensated. Some image blur due to dynamic excitation by the cryocoolers was noted. A successful damping scheme has been developed experimentally. For the NOAO Extremely Wide Field Infrared Mosaic camera (NEWFIRM), the entire optical support structure is mechanically tuned to deflect and rotate precisely as a rigid body relative to the telescope focal plane. This causes the optical train to remain pointed at a fixed position in the focal plane, minimizing image motion on the science detector. This instrument is still in fabrication.
Elias Jay
Hileman Edward A.
Joyce Richard R.
Liang Manlai
Pearson E. E.
No associations
LandOfFree
Passive compensation of gravity flexure in optical instruments 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 Passive compensation of gravity flexure in optical instruments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive compensation of gravity flexure in optical instruments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1822518