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利用输出波长在2.0μm处的分布反馈激光器对CO2气体的两条特征谱线进行扫描以实现气体温度的测量。介绍了利用可调谐激光吸收光谱方法进行温度测量的基本原理,提出了用多线组合非线性最小二乘法拟合高温吸收光谱的吸光度方法。常压下在静态高温炉中进行了实验,设定温度为900K～1200K时,经实验得到的温度值与热电偶测量值的温差在8%以内,计算得到CO2的5007.7874cm-1吸收线强与理论计算值相对误差小于14%。为今后的气体温度测量及多参数同时测量提供了借鉴。
The two characteristic lines of the CO2 gas are scanned using a distributed feedback laser with an output wavelength of 2.0 μm to measure the gas temperature. The basic principle of temperature measurement using tunable laser absorption spectroscopy is introduced. A new method for fitting the absorbance of high temperature absorption spectrum by multi-line combined nonlinear least square method is proposed. Atmospheric pressure in a static high-temperature furnace experiments were conducted, the set temperature of 900K ~ 1200K, the experimental temperature and thermocouple measured value of the temperature difference within 8%, calculated CO2 absorption of 5007.7874cm-1 strong The relative error with theoretical calculation is less than 14%. It provides references for the simultaneous measurement of gas temperature and multi-parameters in the future.