Spectroscopic survey telescope design. II - Tracking geometry

Details Spectroscopic survey telescope design. II - Tracking geometry Spectroscopic survey telescope design. II - Tracking geometry

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..790r&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Physics

Optics

Reflecting Telescopes, Servocontrol, Tracking (Position), Charge Coupled Devices, Design Analysis, Fiber Optics

Scientific paper

An Arecibo radio telescope-like optical telescope is under development which will operate in semitransit mode for spectroscopic survey work, using a five-axis servomechanism in the telescope's upper section to track an object's image locus on the focal sphere. Once the telescope is in the requisite azimuth position, a transit time for each object relative to the telescope structure can be determined and a strategy devised for driving the fiber-carrying optical head into conjunction with the image focus. The trigonometric mapping between the hour angle and declination functions of each object, on the one hand, and the five coordinates of the tracking device in the telescope's upper section, on the other, is a special transformation applicable to all telescopes of this type.

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