The Linearity Analysis of Ultrahigh Temperature FTIR Spectral Emissivity Measurement System
WANG Zong-wei1, DAI Jing-min1, HE Xiao-wa2, YANG Chun-ling1
1. School of Electrical Engineering and Automation，Harbin Institute of Technology, Harbin 150001, China 2. Aerospace Research Institute of Material and Processing Technology, Beijing 100076, China
Abstract：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.
Key words：Thermal radiation properties;Spectral emissivity;Linearity;Ultra- high temperature;Fourier spectrometer
王宗伟1，戴景民1，何小瓦2，杨春玲1 . 超高温FTIR光谱发射率测量系统的线性度分析[J]. 光谱学与光谱分析, 2012, 32(02): 313-316.
WANG Zong-wei1, DAI Jing-min1, HE Xiao-wa2, YANG Chun-ling1 . The Linearity Analysis of Ultrahigh Temperature FTIR Spectral Emissivity Measurement System. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(02): 313-316.
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