Multiplexed precision thermal measurement system for large structured mirrors

David M. Dryden; Earl T. Pearson

doi:10.1117/12.19247

1 July 1990 Multiplexed precision thermal measurement system for large structured mirrors

David M. Dryden, Earl T. Pearson

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19247
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

Citation Download Citation

David M. Dryden and Earl T. Pearson "Multiplexed precision thermal measurement system for large structured mirrors", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19247

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