Volume 16 Issue 6
Nov.  2023
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REN Li-min, CHEN Li-heng, MENG Xu, WANG Zhi. Thermal design of ground weak force measurement system for inertial sensors[J]. Chinese Optics, 2023, 16(6): 1404-1413. doi: 10.37188/CO.2023-0022
Citation: REN Li-min, CHEN Li-heng, MENG Xu, WANG Zhi. Thermal design of ground weak force measurement system for inertial sensors[J]. Chinese Optics, 2023, 16(6): 1404-1413. doi: 10.37188/CO.2023-0022

Thermal design of ground weak force measurement system for inertial sensors

doi: 10.37188/CO.2023-0022
Funds:  Supported by National Key R & D Program of China (No. 2020YFC2200600)
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  • Corresponding author: chenliheng3@163.com
  • Received Date: 04 Feb 2023
  • Rev Recd Date: 20 Feb 2023
  • Accepted Date: 26 Jul 2023
  • Available Online: 26 Jul 2023
  • In order to meet the ultra-high temperature stability requirements of the ground weak force measurement system for inertial sensor, the thermal design of the whole system is carried out. Firstly, the structure of ground weak force measurement system of inertial sensor, heat transfer path of sensitive structure and internal heat source are introduced. Secondly, according to the index requirements of the thermal control of the system, a high-precision thermal control method combining the three-stage thermal control structure and Proportional Integral Differential (PID) control algorithm is proposed to reduce the influence of temperature noise on the detection sensitivity of the inertial sensor. Then, UG/NX software is used to establish the finite element model and carry out the thermal analysis calculation under different working conditions, and the temperature change value of the measurement system in the time domain after equilibrium is (1.2−1.6) ×10−5 K. Finally, the temperature distribution of the measurement system in the time domain is described in the frequency domain, and the temperature stability results of sensitive structure of the inertial sensor are obtained. The analysis results show that under the current thermal control measures, the temperature stability of the sensitive structure of the inertial sensor is better than 10−4 K/Hz1/2, meeting the requirements of thermal control indicators, and the thermal design scheme is reasonable and feasible.

     

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