Improved chopping secondary system for a 300 MM balloon-borne IR telescope

Details Improved chopping secondary system for a 300 MM balloon-borne IR telescope Improved chopping secondary system for a 300 MM balloon-borne IR telescope

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..300z&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 1 (A91-23201 08-89

Astronomy and Astrophysics

Astronomy

Balloon-Borne Instruments, Infrared Telescopes, Modulation, Infrared Astronomy, Millimeter Waves, Mirrors, Radio Telescopes

Scientific paper

An improved chopping secondary system for a 300 mm balloon-borne IR telescope (BIT) has been developed. BIT is planned to be flown for the first tine in May 1990 in China. Design and overall properties of the chopping secondary system are presented. The important feature of this chopper is its control driver, which is a new type of vibrator. The whole system including the control circuit is very simple, lightweight, and low-cost. A 2-msec rise time of the 93 mm secondary mirror motion was achieved at a frequency of 10 Hz.

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