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本文提出一种用于温度传感的气体吸收谱线宽度检测方法,该方法基于比尔-朗伯定律中气体吸收谱线宽度与温度关系,以特征线宽代替半高全宽(FWHM)进行线宽的测量.研究气体所处环境的温度改变对气体吸收谱线宽度的影响.以乙炔气体为例,在0~90℃的温度范围内,测量了其5条较强吸收谱线的特征线宽变化情况.特征线宽测量值标准差<0.6 pm,温度分辨力<2℃,稳定性好.此方法有效避免了光源功率的波动对特征线宽测量的影响,提高了线宽测量的准确性,该方法应用于气体温度测量具有可行性.
In this paper, we propose a gas detection line width detection method for temperature sensing based on the relationship between the gas absorption line width and temperature in Beer-Lambert law, the line width of full width at half maximum (FWHM) The influence of the change of temperature on the absorption spectrum of the gas is studied.The variation of the characteristic line width of the five absorption lines is measured in the temperature range of 0 ~ 90 ℃ with acetylene gas as an example The standard deviation of characteristic line width measurement is less than 0.6 pm, the temperature resolution is less than 2 ℃, and the stability is good.The method effectively avoids the influence of fluctuation of light source power on characteristic line width measurement, improves the accuracy of line width measurement, The method is applicable to gas temperature measurement.