快速腔长扫描光腔衰荡光谱仪及其中痕量气体测量中的应用

大气与环境光学学报 ›› 2016, Vol. 11 ›› Issue (3): 197-203.

快速腔长扫描光腔衰荡光谱仪及其中痕量气体测量中的应用

孙丽琴, 陈兵, 何亚柏*, 李明星, 陈祥, 阚瑞峰

（中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室, 安徽合肥 230031）

出版日期:2016-05-28 发布日期:2016-05-25
通讯作者: 何亚柏，（1962-）男，研究员，博士生导师，主要从事非线性光学，激光光谱超灵敏气体检测，特别是连续波衰荡吸收光谱痕量气体检测方面的研究。 E-mail:yabaihe@aiofm.ac.cn
作者简介:孙丽琴，（1989-）女，安徽安庆人，硕士研究生，主要从事连续激光光腔衰荡吸收光谱法检测痕量气体方面的研究。
基金资助:
Supported by Strategic Priority Research Program of the Chinese Academy of Sciences(中国科学院战略性先导科技专项, XDA05040102), Natural Science Foundation of Anhui Province, China(安徽省自然科学基金, 1408085MKL48)

Rapidly Swept Cavity Ring-Down Spectrometer and Its Trace-Level Gas Detection Application

孙丽琴, 陈兵, 何亚柏*, 李明星, 陈祥, 阚瑞峰

(Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China)

Published:2016-05-28 Online:2016-05-25

摘要/Abstract

摘要：

基于PZT快速腔长扫描技术和可调谐连续DFB激光器，搭建了一套快速腔长扫描光腔衰荡光谱探测装置，通过PZT快速腔长扫描实现激光单纵模与光腔纵模的模式匹配与破坏，以完成腔内光信号的独立衰减以及对此衰减过程快慢的测量。实验表明该装置不仅测量灵敏度高达10^-9量级，而且稳定性强，装置简单且易于操作。通过对CH₄气体在1653.72 nm 附近的吸收光谱测量，并用HITRAN数据库模拟校准，验证了该装置的定量测量能力。利用该装置通过固定激光波长测量吸收峰中心值方法对大气中CH4气体含量变化进行了探测。

关键词: 光腔衰荡光谱, CH₄, 腔长扫描, 吸收光谱

Abstract:

Based on near-infrared continuous-wave diode lasers, a rapidly swept cavity ringdown spectrometer was developed. By rapidly sweeping the cavity length based on a PZT transducer, the longitude mode between the laser source and cavity was matched and dis-matched. Thus, the optical signal inside cavity finished its ring down and the measurement of the ring-down rate. The experiments show that not only the significant advantage in sensitivity achieve 10^-9 cm^-1 , but also the great stable and reliable performances of the spectrometer. The quantitative capability of the instrument was also demonstrated by measuring the absorption spectroscopy of CH4 around 1653.72 nm. The instrument was used to monitor the concentration changes of ambient CH4 by measuring the absorbing peak value with a fixed wavelength source.

Key words: cavity ringdown spectroscopy, CH4, cavity swept, absorption spectrum

中图分类号:

0433.5

孙丽琴陈兵何亚柏李明星陈祥阚瑞峰. 快速腔长扫描光腔衰荡光谱仪及其中痕量气体测量中的应用[J]. 大气与环境光学学报, 2016, 11(3): 197-203.

SUN Li-Qin, CHEN Bing, HE Ya-Bai, LI Ming-Xing, CHEN Xiang, KAN Rui-Feng. Rapidly Swept Cavity Ring-Down Spectrometer and Its Trace-Level Gas Detection Application[J]. Journal of Atmospheric and Environmental Optics, 2016, 11(3): 197-203.

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