红外, 2015, 36 (7): 6, 网络出版: 2015-09-08  

基于傅里叶变换红外光谱仪的光谱发射率估计

Estimation of Spectral Emissivity Based on Fourier Transform Infrared Spectrometer
作者单位
沈阳航空航天大学自动化学院,辽宁 沈阳 110136
摘要
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。
Abstract
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.

席剑辉, 徐振方, 傅莉, 王琦. 基于傅里叶变换红外光谱仪的光谱发射率估计[J]. 红外, 2015, 36(7): 6. XI Jian-hui, XU Zhen-fang, FU Li, WANG Qi. Estimation of Spectral Emissivity Based on Fourier Transform Infrared Spectrometer[J]. INFRARED, 2015, 36(7): 6.

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