Research on the principle of space high-precision temperature control system of liquid crystals based Stokes polarimeter

Xin-Wei Zhang; Yang Zhang; Jia-Ben Lin; Jun-Feng Hou; Yuan-Yong Deng

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Research on the principle of space high-precision temperature control system of liquid crystals based Stokes polarimeter

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摘要

The magnetic field is one of the most important parameters in solar physics,and a polarimeter is the key device to measure the solar magnetic field.Liquid crystals based Stokes polarimeter is a novel technology,and will be applied for magnetic field measurement in the first space-based solar observatory satellite developed by China,Advanced Space-based Solar Observatory.However,the liquid crystals based Stokes polarimeter in space is not a mature technology.Therefore,it is of great scientific significance to study the control method and characteristics of the device.The retardation produced by a liquid crystal variable retarder is sensitive to the temperature,and the retardation changes 0.09°per 0.10℃.The error in polarization measurement caused by this change is 0.016,which affects the accuracy of magnetic field measurement.In order to ensure the stability of its performance,this paper proposes a high-precision temperature control system for liquid crystals based Stokes polarimeter in space.In order to optimize the structure design and temperature control system,the temperature field of liquid crystals based Stokes polarimeter is analyzed by the finite element method,and the influence of light on the temperature field of the liquid crystal variable retarder is analyzed theoretically.By analyzing the principle of highprecision temperature measurement in space,a high-precision temperature measurement circuit based on integrated operational amplifier,programmable amplifier and 12 bit A/D is designed,and a high-precision space temperature control system is developed by applying the integral separation PI temperature control algorithm and PWM driving heating films.The experimental results show that the effect of temperature control is accurate and stable,whenever the liquid crystals based Stokes polarimeter is either in the air or vacuum.The temperature stability is within±0.0150℃,which demonstrates greatly improved stability for the liquid crystals based Stokes polarimeter.

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《天文和天体物理学研究》 |2021年第1期|97-104|共8页
作者
Xin-Wei Zhang; Yang Zhang; Jia-Ben Lin; Jun-Feng Hou; Yuan-Yong Deng;
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作者单位

Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China;

School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;

School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;

School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;

Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China;

School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;

Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China;

School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing 101408 China;

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1. Research on the principle of space high-precision temperature control system of liquid crystals based Stokes polarimeter [J] . Xin-Wei Zhang ,Yang Zhang ,Jia-Ben Lin . 天文和天体物理学研究 . 2021,第001期
2. Design and calibration of a high-sensitivity and high-accuracy polarimeter based on liquid crystal variable retarders [J] . Jing Guo ,De-Qing Ren ,Cheng-Chao Liu . 天文和天体物理学研究 . 2017,第001期
3. PREPARATION OF LIQUID CRYSTALLINE COPOLYESTERS WITH SPACERS BASED ON BISPHENOL-A,BISPHENOL-S OR POLYSULFONE BY DIRECT POLYCONDENSATION [J] . 汪平平 ,张鸿志 . 高分子科学：英文版 . 1989,第1期
4. La Salle Invariant Principle of Control Systems with Dissipative Hamiltonian Realization [C] . Daizhan Cheng . 第二十届中国控制会议 . 2001
5. NodE-based Congestion Control Algorithm For Networked Control Systems [A] . Yasir Babiker Hamdan . 2015

Research on the principle of space high-precision temperature control system of liquid crystals based Stokes polarimeter

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