An updated T-series thermocouple measurement system for high-accuracy temperature measurements of the MMT primary mirror

D. Clark; J. D. Gibson

doi:10.1117/12.925459

17 September 2012 An updated T-series thermocouple measurement system for high-accuracy temperature measurements of the MMT primary mirror

D. Clark, J. D. Gibson

Author Affiliations +

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 844433 (2012) https://doi.org/10.1117/12.925459
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Starting in 2009, MMTO began design and installation of a new set of electronics to measure a set of radiallydistributed type T thermocouples installed after the primary mirror polishing was completed. These thermocouples are arranged in both single measurement points and as thermopiles for differential temperature sensing. Since the goal of the primary mirror temperature control system is to minimize mirror seeing and mirror figure errors induced by temperature variation across the primary mirror, it depends on excellent accuracy from the temperature sensing system. The new electronics encompass on-board cold-junction compensation, real-time ITS-90 curve fitting, and Ethernet connectivity to the data servers running in the MMTO software infrastructure. We describe the hardware design, system wiring, and software used in this system.

Citation Download Citation

D. Clark and J. D. Gibson "An updated T-series thermocouple measurement system for high-accuracy temperature measurements of the MMT primary mirror", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844433 (17 September 2012); https://doi.org/10.1117/12.925459

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