17 September 2012 An updated T-series thermocouple measurement system for high-accuracy temperature measurements of the MMT primary mirror
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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.
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D. Clark, D. Clark, J. D. Gibson, 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); doi: 10.1117/12.925459; https://doi.org/10.1117/12.925459
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