Hadamard变换成像光谱仪实验室辐射定标方法

Laboratory radiation calibration method of Hadamard transform imaging spectrometer

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 is a multi-channel detection digital transform spectrometer detection technology.The spectromter used this technology to achieving spectral imaging. Based on the digital micromirror array device of the Hadamard transform spectrometer working principles and the instrument,a series of precision laboratory calibration methods were researched and employed for the Hadamard transform imaging spectrometer.A point light source in long distance was used for the pixel response nonuniformity correction of the CMOS detector.The uncertainty of the relative calibration was 4.6%.Solar simulator and spectral radiometer were used in absolute radiation calibration of the whole system,and the uncertainty of the absolute radiation calibration was 8.92%.Both of the uncertainty of relative calibration and the uncertainty of the absolute radiation calibration met the requirements of the projection.By actual objects imaging,the laboratory calibration methods of the Hadamard transform imaging spectrometer are proved accurate.