中文摘要：

为研究航天领域特种材料高温区域的光谱辐射特性,建立了基于傅里叶光谱仪的超高温光谱发射率测量系统。系统线性度是发射率测量精度的保证,通过测量多温度点黑体辐射的光谱信号,采用多温度点线性拟合方法求得每个光谱点的光谱信号值与黑体光谱辐射亮度的函数关系式,并结合仪器线性度测量理论,建立了光谱发射率测量系统的线性度测量方法。实验测量了黑体温度范围1 000～2 000℃和光谱范围3～20μm的光谱辐射信号,求得波长λ=4μm的理论直线与测量光谱值的线性关系。实验表明,仪器在4～18μm光谱范围响应较好,除CO2强吸收光谱区域,仪器的光谱线性度均优于1%。当测量系统线性度一定时,温度越高,光谱误差对发射率的影响越小。评定光谱发射率测量系统的线性度有利于剔除个别温度点光谱扰动带来的误差。

英文摘要：

To study thermal radiation properties of special materials at high temperature in aerospace fields,the ultrahigh temperature spectral emissivity measurement system with Fourier spectrometer has been established.The linearity of system is the guarantee of emissivity measurement precision.Through measuring spectral radiation signals of a blackbody source at different temperatures,the function relations between spectral signal values and blackbody spectral radiation luminance of every spectrum points were calculated with the method of multi-temperature and multi-spectrum linear fitting.The spectral radiation signals of blackbody were measured between 1 000 ℃ and 2 000 ℃ in the spectral region from 3 to 20 μm.The linear relations between spectral signal and theory line at wavelength of 4 μm were calculated and introduced.The spectral response is well good between 4 and 18 μm,the spectral linearity are less than 1% except CO2 strong absorption spectrum regions.The results show that when the errors of measured spectrum radiation and linear fitting theory lines are certain,the higher the temperature,the smaller the spectral errors on emissivity.The linearity analysis of spectrum response is good at eliminating errors caused by individual temperature＇ disturbance to the spectra.