基于傅里叶变换红外光谱仪的光谱发射率估计

基于傅里叶变换红外(Fourier Transform Infrared, FTIR)光谱仪等先进测试手段，建立了一种估计目标光谱发射率的方法框架。首先，通过双温度测量标定获得FTIR光谱仪关于波长的背景辐射亮度函数和响应度函数，提高了测量的准确性；其次，基于大气窗口的辐射亮度数据进行高阶多项式拟合，进一步抑制了杂散辐射的影响；然后通过对大气吸收波长的辐射特性进行估计，获得了所测波段的红外亮度曲线；最后估计了目标的光谱发射率，其相对误差均在1%以内。测试结果表明，本文方法行之有效。

Estimation of Spectral Emissivity Based on Fourier Transform Infrared Spectrometer

A method framework for estimating the spectral emissivity of a target is established on the basis of a Fourier Transform Infrared (FTIR) spectrometer. First, a double-temperature calibration method is used to obtain the background radiance function and responsibility function of the FTIR spectrometer, so as to improve the measurement accuracy. Secondly, high order polynomial fitting is carried out on the basis of the radiance data of the atmospheric window, so as to further suppress the interference from stray radiation. Then, by estimating the radiation characteristics at atmospheric absorption wavelengths, the infrared radiance curves in the measured wavebands are obtained. Finally, the spectral emissivity of the target is estimated. The relative error is within 1%. The measurement results show that the proposed method is effective.