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The space gravitational wave detection TianQin mission requires that the residual acceleration noise of the inertial sensor does not exceed 10–15 m/s2/Hz1/2 at around 6 mHz in the sensitive axis. The temperature gradient noise is one of the main direct disturbance effects on the test mass. The TianQin satellite demands that the temperature difference noise on both sides of the sensitive axis of the inertial sensor test mass be controlled within 5 μK/Hz1/2 in the measurement frequency band. This work introduces the design scheme of a μK-level high-precision temperature sensor, covering a temperature measurement range of 10 ~ 30 °C, with a temperature resolution of 3 μK/Hz1/2 at a frequency of 6 mHz. A temperature sensing circuit based on AC carrier modulation of the Wheatstone bridge is proposed. Due to the potential influence of ground environment temperature on the performance testing of high-precision temperature sensors, an ultra-high stability thermal insulation platform is designed for the noise test and evaluation on the μK-level.

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Design of a µK-Level High-Precision Temperature Sensing System for TianQin Inertial Sensor Thermal Diagnostics

  • 会议论文

  • 发表日期：

    2025年

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  • Hui Chen,
  • Xing-Yu Yan,
  • Shao-Bo Qu,
  • Yanzheng Bai,
  • Ze-Bing Zhou

摘要

The space gravitational wave detection TianQin mission requires that the residual acceleration noise of the inertial sensor does not exceed 10–15 m/s2/Hz1/2 at around 6 mHz in the sensitive axis. The temperature gradient noise is one of the main direct disturbance effects on the test mass. The TianQin satellite demands that the temperature difference noise on both sides of the sensitive axis of the inertial sensor test mass be controlled within 5 μK/Hz1/2 in the measurement frequency band. This work introduces the design scheme of a μK-level high-precision temperature sensor, covering a temperature measurement range of 10 ~ 30 °C, with a temperature resolution of 3 μK/Hz1/2 at a frequency of 6 mHz. A temperature sensing circuit based on AC carrier modulation of the Wheatstone bridge is proposed. Due to the potential influence of ground environment temperature on the performance testing of high-precision temperature sensors, an ultra-high stability thermal insulation platform is designed for the noise test and evaluation on the μK-level.