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Linear calibration-free wavelength modulation spectroscopy
Microwave and Optical Technology Letters ( IF 1.5 ) Pub Date : 2021-10-04 , DOI: 10.1002/mop.33063
Renjie Li 1, 2 , Fei Li 1 , Xin Lin 1 , Xilong Yu 1, 2
Affiliation  

This article presents a new linear calibration-free wavelength modulation spectroscopy (LCF-WMS) technique for gas sensing. By combining the natural logarithms of the transmitted intensity and background signals, this technique eliminates the effects of the intensity, intensity modulation, and the modulation phase to obtain integrable harmonic signals along the line-of-sight and thus realize calibration-free measurements. To illustrate the validity of the LCF-WMS technique, it was applied to measurement of the water vapor concentration in air at ambient temperature. Because of its specific features of line-of-sight integrability and baseline independence, this method will be advantageous in absorption tomography and high-pressure applications.

中文翻译:

线性免校准波长调制光谱

本文介绍了一种用于气体传感的新型线性免校准波长调制光谱 (LCF-WMS) 技术。该技术通过结合发射强度和背景信号的自然对数,消除强度、强度调制和调制相位的影响,获得沿视线的可积分谐波信号,从而实现免校准测量。为了说明 LCF-WMS 技术的有效性,它被应用于测量环境温度下空气中的水蒸气浓度。由于其视线可积分性和基线独立性的具体特点,该方法将有利于吸收层析成像和高压应用。
更新日期:2021-10-04
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