注入锁定腔增强拉曼光谱微量气体检测技术  

Trace gas detection using cavity-enhanced Raman spectroscopy with injection locking

作　　者：王品一[1] 万福[1] 王建新[1] 陈伟根[1] 朱承治 刘晔 WANG Pin-yi;WAN Fu;WANG Jian-xin;CHEN Wei-gen;ZHU Cheng-zhi;LIU Ye(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,Chin;State Grid Zhejiang Power Company,Hangzhou 310012,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]国网浙江省电力有限公司,浙江杭州310012

出　　处：《光学精密工程》2018年第8期1917-1924,共8页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61605020;No.U1766217);重庆市基础研究与前沿探索项目(No.cstc2016jcyjA0427);中国博士后科学基金资助项目(No.2016M600722;No.2017T100675);重庆市博士后科研项目专项经费(No.Xm2016023);中央高校基本科研经费资助项目(No.106112016CDJCR151224)

摘　　要：为了提高微量气体的拉曼散射强度,本文设计并搭建了注入锁定腔增强拉曼光谱微量气体检测平台。半导体激光器(波长为638nm,功率为15mW)输出到由三块高反镜组成的V型增强腔中,结合注入锁定技术,腔内激光强度达到7.5 W,实现了500倍的增强效果。利用该实验平台对微量单一气体及其混合气体进行了拉曼检测,并根据拉曼特征谱峰选取原则及信噪比大于3的原则,确定了H2、CO、CO2、CH4、C2H6、C2H4、C2H2的特征拉曼谱峰分别为4 156,2 143,1 388,2 918,2 955,1 344,1 975cm-1,最小检测极限分别为10.2,21.7,9.4,2.1,8.9,4.9,3.3Pa。腔增强拉曼光谱法可以实现微量同核双原子气体检测及利用单一波长激光的混合气体同时检测,具有替代气体检测传统光谱方法的潜力。In order to improve the Raman scattering intensity of a trace gas,a cavity-enhanced Raman spectroscopy(CERS)technique with injection locking was introduced.A diode laser input(638 nm,15 mW)was coupled into a V-shaped enhanced cavity composed of three highly reflective mirrors.Using the injection locking technique,an intracavity laser beam was generated and enhanced by a factor of 500 to obtain a power of 7.5 W.The Raman spectra of the individual trace gases and the mixture were obtained.According to the principle of Raman spectrum peak selection and a signal-to-noise ratio greater than 3,the characteristic Raman peaks of H 2,CO,CO 2,CH 4,C 2H 6,C 2H 4,and C 2H 2 are determined as 4 156,2 143,1 388,2 918,2 955,1 344,and 1 975 cm-1,respectively,and the limits of detection are determined as 10.2,21.7,9.4,2.1,8.9,4.9,and 3.3 Pa.Trace homonuclear diatomic gases and mixed gases can thus be detected simultaneously using a single-wavelength diode laser and CERS.Therefore,CERS has the potential to become an alternative optical technology for gas detection.

关 键 词：拉曼光谱 痕量气体检测 腔增强 注入锁定 

分 类 号：TP657.37[自动化与计算机技术—控制理论与控制工程]