基于声光可调谐滤波器角位移补偿方法研究

Study on Compensating the Angular Shift Error of the Acousto-Optic Tunable Filter

基于声光可调谐滤波器的偏振成像光谱仪是一类同时具有成像、光谱测量和偏振测量功能的新型光电传感器。非共线声光可调谐滤波器(AOTF)可以快速获得全视场不同窄谱段的o光和e光偏振图像。但是,AOTF波长调谐时,衍射角会随扫描波长的变化而变化,造成同一目标不同谱段的图像发生相对偏移。本文介绍了非共线AOTF的工作原理,分析了基于声光可调谐滤波器的偏振成像光谱仪角位移产生的机理,对近些年来国内外的成像光谱偏振仪的基于声光可调谐滤波器的偏振成像光谱仪角位移补偿方法研究进行了总结分析,对于旋转平面反射镜方法、在晶体出射面加工楔角的方法、棱镜补偿方法、单晶体光楔补偿方法、双光楔补偿方法的原理进行了阐述,并对基于声光可调谐滤波器的偏振成像光谱仪的发展趋势进行了展望。

AOTF Imaging spectropolarimeter is a type of novel photo electric sensor which integrated the functions of imaging, spectrometry and polarimetry. Non-collinear acousto-optic tunable filter (AOTF) can quickly get the whole field of different narrow-spectrum light with ordinary and ex-traordinary polarization state images. However, AOTF wavelength tuning, the diffraction angle will change with changes in the wavelength scanning, resulting in the same target in different spectral images relative shift occurred. This article describes the non-collinear acousto-optic tunable filter (AOTF) and the basic principles of the angular shift error of the Acousto-optic Tunable Filter. Angular shift error compensation method of polarization imaging spectrometer for acousto-optic tunable filter in recent years was summarized. The principle for rotating mir-ror method, the crystal surface wedge method, the prism compensation method, single crystal optical wedge compensation method, and double wedge compensation method were described, and the development trend of polarization imaging spectrometer based on acousto-optic tunable filter was discussed.