Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications

Details Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356..892g&link_type=abstract

Proc. SPIE Vol. 3356, p. 892-903, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Statistics

Applications

1

Scientific paper

The Gravity Probe-B cryogenic star-tracking telescope provides the inertial pointing reference, as established by a distant 'fixed' guide star, with milli-arc-second resolution per year for the NASA/Stanford general-relativity gyroscope experiment. The design of the f/27 modified- Cassegrain telescope is briefly reviewed. Then discussed are two of its unique aspects: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5 Kelvin applications. The star image in the telescope is split by roof prisms to generate quadrant pointing information within few arc-seconds about the guide-star direction. The corresponding roof-edge diffraction effects due to the roof- prisms were compared with theoretical calculations, which successfully interpreted the test result and indicate the need for enlarging post-focal-plane detection apertures, as compared with ray-trace situation. On the other hand, a novel fused-quartz bonding technique was developed and found superior in many aspects to index-matching epoxies, optical contacting, and Corning's proprietary frit bonding for both room-temperature and cryogenic applications. The bonding was simple, economical, yet extremely reliable and optically precise. It resulted in strengths near that of fused quartz, with less than 10 nano-meter interface thickness demonstrated.

Affiliated with

Also associated with

No associations

Rating

Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications 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 Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two unique aspects of gravity probe-B star-tracking space telescope: (1) focal-plane roof-edge diffraction and (2) fused-quartz bonding for 2.5-Kelvin applications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1540318