中国物理B ›› 2017, Vol. 26 ›› Issue (8): 89501-089501.doi: 10.1088/1674-1056/26/8/089501

• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇    

Error analysis and optimal design of polarization calibration unit for solar telescope

Jun-Feng Hou(侯俊峰), Dong-Guang Wang(王东光), Yuan-Yong Deng(邓元勇), Ying-Zi Sun(孙英姿), Zhi-Yong Zhang(张志勇)   

  1. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
  • 收稿日期:2017-03-13 修回日期:2017-04-04 出版日期:2017-08-05 发布日期:2017-08-05
  • 通讯作者: Jun-Feng Hou E-mail:jfhou@bao.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11403047, 11427901, 11178005, 11373044, 11273034, and 11373042).

Error analysis and optimal design of polarization calibration unit for solar telescope

Jun-Feng Hou(侯俊峰), Dong-Guang Wang(王东光), Yuan-Yong Deng(邓元勇), Ying-Zi Sun(孙英姿), Zhi-Yong Zhang(张志勇)   

  1. Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
  • Received:2017-03-13 Revised:2017-04-04 Online:2017-08-05 Published:2017-08-05
  • Contact: Jun-Feng Hou E-mail:jfhou@bao.ac.cn
  • About author:0.1088/1674-1056/26/8/
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11403047, 11427901, 11178005, 11373044, 11273034, and 11373042).

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摘要：

Polarization calibration unit (PCU) has become an indispensable element for solar telescopes to remove the instrumental polarization; the polarimetric accuracy of calibration depends strongly on the properties of PCU. In the paper, we analyze the measurement errors induced by PCU based on polarized light theory and find that the imperfections of the waveplate generate the main calibration errors. An optimized calibration method is proposed to avoid the effects from waveplate imperfections, and a numerical simulation is given to evaluate the polarization accuracy by analyzing the relation between calibration error and intensity instability. The work is very important for solar telescopes with high polarization precision up to 10-4 Ic.

关键词: solar telescope, polarization calibration

Abstract:

Polarization calibration unit (PCU) has become an indispensable element for solar telescopes to remove the instrumental polarization; the polarimetric accuracy of calibration depends strongly on the properties of PCU. In the paper, we analyze the measurement errors induced by PCU based on polarized light theory and find that the imperfections of the waveplate generate the main calibration errors. An optimized calibration method is proposed to avoid the effects from waveplate imperfections, and a numerical simulation is given to evaluate the polarization accuracy by analyzing the relation between calibration error and intensity instability. The work is very important for solar telescopes with high polarization precision up to 10-4 Ic.

Key words: solar telescope, polarization calibration

中图分类号:  (Ground-based ultraviolet, optical and infrared telescopes)

  • 95.55.Cs
95.55.Ev (Solar instruments) 95.75.Hi (Polarimetry)