Random vibration-driven continuous-wave CRDS system for calibration-free gas concentration measurement

被引：3
作者：
Song, Zhenyuan [1 ]
Xu, Lijun [1 ,2 ]
Xie, Heng [1 ]
Cao, Zhang [1 ,2 ]
机构：
[1] Beihang Univ, Sch Instrumentat & Optoelect Engn, Beijing 100191, Peoples R China
[2] Beijing Adv Innovat Ctr Big Data Based Precis Med, Beijing 100191, Peoples R China
来源：
OPTICS LETTERS | 2020年 / 45卷 / 03期
基金：
中国国家自然科学基金;
关键词：
CAVITY RINGDOWN SPECTROSCOPY; DIODE-LASER; DOWN SPECTROSCOPY; SPECTROMETER; SCHEMES;
D O I：
10.1364/OL.382697
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Random vibrations were employed to pick up each monochromatic component in a continuous-wave cavity ringdown spectroscopy (CRDS) system using a bichromatic laser source. Light frequencies were selected within flat portions of an absorption profile to suppress the jitter in laser frequency during measurements. An interference effect caused by cavity length variations was suppressed by optimizing the initial fit point for each ringdown transient. The difference in exponential decay rates of two frequencies determined the gas mole fraction, and no calibration of empty cavity losses was necessary. Experiments on varying humidity were conducted, and the results agreed with the readings of a commercial hygrometer. (C) 2020 Optical Society of America
引用
收藏
页码：746 / 749
页数：4
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