光学精密工程2009，Vol.17Issue(6)：1431-1435,5.
天空偏振光测量系统的设计
Design of skylight polarization measurement system
摘要
Abstract
According to the principle that light polarization can be expressed with a Stokes vector, a new system to measure the polarized skylight distribution is developed. The system is composed of a computer,a modified equatorial mount,an optical fiber spectrometer and an improved astronomical telescope mounted with a rotatable linear polarizer. The spectral resolution of this system is 1.4 nm for the measurement when wavelength ranges from 400 nm to 900 nm. Using modified equatorial mount, the system can scan the points of celestial hemisphere at azimuth ranges from 0°to 180° and elevation 0° to 90°at an angular resolution of2.5°. For a full-angle viewing field of 4.5°, this system can measure the radiance intensity, the Degree of Linear Polarization (DOLP), and the Angle of Linear Polarization (AOLP) of the celestial. The calibration results show that the repeatability of intensity measurements is 99% in spectral ranges from 450 nm to 500 nm, and (95±3)% from 500 nm to 900 nm. The uncertainty of DOLP is less than 2% in spectral ranges from 400 nm to 750 nm, especially 1.2% at 475 nm.The angle error of AOLP is smaller than 2°.关键词
天空偏振光/偏振光测量/斯托克斯矢量/偏振度/瑞利散射Key words
skylight polarization/polarization measurement/Stokes vector/degree of polarization/Rayleigh scattering分类
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崔岩,曹楠楠,褚金奎,赵开春,王体昌..天空偏振光测量系统的设计[J].光学精密工程,2009,17(6):1431-1435,5.基金项目
Supported by the Major State Basic Research Program of China(Grant 2006CB300400) （Grant 2006CB300400）
the National Natural Science Foundation of China(Grant No.50775017) （Grant No.50775017）
