Multiplexed precision thermal measurement system for large structured mirrors

Details Multiplexed precision thermal measurement system for large structured mirrors Multiplexed precision thermal measurement system for large structured mirrors

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..825d&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

Borosilicate Glass, Electronic Packaging, Mirrors, Software Tools, Temperature Measuring Instruments, Analog To Digital Converters, Calibrating, Multiplexing, Operational Amplifiers

Scientific paper

A thermal sensor measurement system, with a resolution better than 0.01 C has been built for the NOAO 3.5-m mirror project. A total of 1000 low-cost precision temperature current transducers are multiplexed through a single 16-bit ADC so that temperature profiles may be obtained in less than 30 sec. The problems and pitfalls encountered in taking a device that was designed to be accurate to 0.5 C and obtaining reliable measurements to + or - 0.003 C with a large number of sensors are discussed.

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