CAJ | 학술논문

根据一束光的偏振特性可以由斯托克斯矢量来表征的原理,设计搭建了一种天空偏振光测量系统.该系统由计算机、赤道仪、光纤光谱仪和配备了可旋转偏振片的改进式天文望远镜组成,在400～900 nm的光谱分辨率为1.4 nm.赤道仪经过标定后可以实现0～180°方位角以及0～90°高度角的调整,角度分辨率为2.5°.系统的光学全视场为4.5°,使用该系统可以测量全天空的光强辐射度、偏振度以及偏振方位角.由标定结果可知,系统光强测量的重复率在450～500 nm为99%,在500～900 nm为(95±3)%;在400～750 nm偏振度测量误差＜2%,在475 nm处达到1.2%.偏振方位角的测量误差＜2°.
근거일속광적편진특성가이유사탁극사시량래표정적원리,설계탑건료일충천공편진광측량계통.해계통유계산궤、적도의、광섬광보의화배비료가선전편진편적개진식천문망원경조성,재400～900 nm적광보분변솔위1.4 nm.적도의경과표정후가이실현0～180°방위각이급0～90°고도각적조정,각도분변솔위2.5°.계통적광학전시장위4.5°,사용해계통가이측량전천공적광강복사도、편진도이급편진방위각.유표정결과가지,계통광강측량적중복솔재450～500 nm위99%,재500～900 nm위(95±3)%;재400～750 nm편진도측량오차＜2%,재475 nm처체도1.2%.편진방위각적측량오차＜2°.
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°.