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

doi:10.1088/1674-1056/26/8/089501

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 I_c.

Keywords: solar telescope polarization calibration

Received: 13 March 2017
Revised: 04 April 2017
Accepted manuscript online:

PACS:	95.55.Cs	(Ground-based ultraviolet, optical and infrared telescopes)
	95.55.Ev	(Solar instruments)
	95.75.Hi	(Polarimetry)

Fund:

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

Corresponding Authors: Jun-Feng Hou
E-mail: jfhou@bao.ac.cn

About author: 0.1088/1674-1056/26/8/

Cite this article:

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) Error analysis and optimal design of polarization calibration unit for solar telescope 2017 Chin. Phys. B 26 089501

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Jun-Feng Hou(侯俊峰), Hai-Feng Wang(王海峰), Gang Wang(王刚), Yong-Quan Luo(骆永全), Hong-Wei Li(李宏伟), Zhen-Long Zhang(张振龙), Dong-Guang Wang(王东光), Yuan-Yong Deng(邓元勇). Chin. Phys. B, 2020, 29(7): 074208.

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