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Proceedings Paper

Multiplexed precision thermal measurement system for large structured mirrors
Author(s): David M. Dryden; Earl T. Pearson
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Paper Abstract

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.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19247
Show Author Affiliations
David M. Dryden, National Optical Astronomy Observatories (United States)
Earl T. Pearson, National Optical Astronomy Observatories (United States)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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