采用中红外量级级联激光器的痕量CO浓度传感器  

Trace carbon monoxide gas sensor based on QCL technology

作　　者：贾博成 张涛 叶紫芃 陈晨[1] JIA Bocheng;ZHANG Tao;YE Zipeng;CHEN Chen(College of instrumentation and electrical Engineering,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130061

出　　处：《激光杂志》2021年第8期15-18,共4页Laser Journal

基　　金：国家重点研发计划项目(No.2018YFC1503802,2016YFC0303902);国家自然科学基金面上项目(No.61871199);吉林省科技计划重点科技研发项目(No.20180201022GX)。

摘　　要：介绍了一种基于中红外光谱吸收原理的痕量一氧化碳(CO)浓度传感器。整套传感器系统采用了激发波长为4.8μm的量子级联激光器(QCL)作为光学光源,使用分光镜将其光束分为能量相等的两束,分别通过长光程herriott吸收气室和参考气室最终到达两个探测器。通过检测系统输出光强信号的电压值,利用朗伯比尔定律进行计算得到所测量的痕量CO浓度值。经过实验验证,当采样时间被设置为4秒时,在一个单独的采样周期内,传感器的灵敏度最高可达40 nmol/mol,并且可长时间稳定运行于室温环境之下。A trace carbon monoxide(CO)concentration sensor based on the absorption principle of mid-infra-red spectroscopy is introduced.The entire sensor system uses a quantum cascade laser(QCL)with an excitation wavelength of 4.8μm as the optical source.The beam splitter splits the beam into two beams of equal energy,and finally reach the two detectors through the long-pathlength herriott absorption chamber and the reference chamber.By measuring the voltage value of the output light intensity signal of the system,the measured trace CO concentration value is calculated by using Lambert Beer’s law.It has been experimentally verified that the sensor system can a-chieve a detection sensitivity of 40 nmol/mol in a sampling time of 4 s and can be stably operated at room temperature for a long time.

关 键 词：一氧化碳 中红外量子级联激光器 herriott吸收气室 痕量浓度检测 

分 类 号：O657.3[理学—分析化学]