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Hadamard变换成像光谱仪采用多通道探测数字变换技术实现光谱成像。主要介绍了基于数字微镜阵列器件的Hadamard变换成像光谱仪的工作原理与仪器结构,研究设计了一套适用于该Hadamard变换成像光谱仪的实验室辐射定标方案。用远距点光源光路进行CMOS探测器像元响应不均匀性修正,获得相对定标精度达到4.6%;采用太阳模拟光源和均匀平行光路,用光谱辐射度计实现标准辐射亮度的传递进行光谱辐射定标,绝对定标精度达到8.92%。通过实物成像,Hadamard变换成像光谱仪的实验室辐射定标方法精确、实用。
Hadamard Transform Imaging Spectrometer uses multichannel probing digital transform technology for spectral imaging. The work principle and instrument structure of Hadamard transform imaging spectrometer based on digital micromirror array device are mainly introduced, and a set of laboratory radiation calibration scheme suitable for the Hadamard transform imaging spectrometer is designed. Using the distance light source optical path to correct the nonuniformity of the CMOS detector pixel, the relative calibration accuracy is up to 4.6%. Using the solar simulating light source and the uniform parallel light path, the spectral radiance meter is used to realize the transmission of the standard radiation brightness for spectral radiation Calibration, the absolute calibration accuracy of 8.92%. Through in-kind imaging, the laboratory radiometric calibration of Hadamard transform imaging spectrometers is accurate and practical.