光栅色散型成像光谱仪工作在可见近红外波段,主要用于海洋水色遥感。仪器采用推扫式成像,共设置15个光谱通道,穿轨方向由1024个像元组成,总视场宽度为14.2°。成像仪的各光谱通道对入射光的偏振状态敏感,为了提高大气顶入瞳辐射的测量精度,需要了解仪器的偏振响应特性,包括偏振灵敏度和相位角。发射前搭建了偏振测试系统,测量仪器的偏振灵敏度和相位角,它们是光谱通道和视场像元的函数。其中980nm波段的偏振灵敏度最高,平均值约为4.69%,443nm波段的偏振灵敏度最低,平均值约为1.81%。随着视场的变化,灵敏度呈现中间低,两边高的变化规律。提出成像仪偏振响应校正方法,利用偏振状态已知的入射光进行实验验证,结果表明该方法可将成像光谱仪偏振响应引入的辐射测量不确定度降低1%~6%。 Grating dispersive imaging spectrometer working in the visible near infrared band, mainly for ocean color remote sensing. The instrument uses push-broom imaging, a total of 15 sets of spectral channels, the track through the 1024 pixels, the total field of view width of 14.2 °. Each spectral channel of the imager is sensitive to the polarization state of the incident light. In order to improve the measurement accuracy of the air entrance pupil radiation, the polarization response characteristics of the instrument, including polarization sensitivity and phase angle, need to be known. Before launch, a polarization test system was set up to measure the polarization sensitivity and phase angle of the instrument as a function of the spectral channels and field-of-view pixels. Among them, the polarization sensitivity of the 980 nm band is the highest, with an average of about 4.69%. The polarization sensitivity of the 443 nm band is the lowest, with an average of about 1.81%. With the change of field of view, the sensitivity of the middle low, high on both sides of the law of change. The method of polarimetric response correction for imager was proposed, and the experimental verification of the incident light with known polarization state was carried out. The experimental results show that this method can reduce the uncertainty of radiation measurement introduced by the polarization response of the imaging spectrometer by 1% ~ 6%.