随着宽谱段高分辨率光谱仪在海洋空间遥感领域的广泛应用，其前置消偏器的设计要求越来越高。为满足成像光谱仪的要求，利用矩阵光学的原理，对应用最为广泛的Lyot消偏器，从残余偏振度的公式出发，对其与晶体楔角和厚度的关系进行数值分析，结合残余偏振度和光学系统分辨率的要求提出了用于宽谱段光谱仪消偏器参数的设计方法。运用该设计方法对400~950 nm宽谱段成像光栅光谱仪消偏器进行设计，在全波段范围内，光谱分辨率为4 nm时，对任意偏振态的线偏光，消偏器的出射光的残余偏振度均小于2%。

With the wide application of broadband imaging spectrometer in the ocean remote sensor, the depolarizer in front of the optical system must satisfy the high requirement. Based on the theory of matrix optics, Lyot depolarizer is introduced. According to the numerical analysis, the relationship between the residual polarization and the angle and thickness of the depolarizer is analyzed in the wide wavelength range. Combined with the residual polarization and resolution requirement of the optical system, a depolarizer used in a broadband imaging spectrometer is designed. With in the wavelength from 400 nm to 950 nm, when the spectral resolution is 4 nm, the residual polarizations of the depolarizer are less than 2% for arbitrary polarization of linear polarized.