Highly sensitive CO_(2)-LITES sensor based on a self-designed low-frequency quartz tuning fork and fiber-coupled MPC  

作　　者：Jinfeng Hou Xiaonan Liu Yahui Liu Ying He Weijiang Zhao Yufei Ma 侯金凤;刘晓楠;刘亚辉;何应;赵卫疆;马欲飞(National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Chinese Optics Letters》2024年第7期105-110,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62335006,62022032,and 62275065);the Key Laboratory of Opto-Electronic Information Acquisition and Manipulation(Anhui University);Ministry of Education(No.OEIAM202202);the Fundamental Research Funds for the Central Universities(No.HIT.OCEF.2023011).

摘　　要：A highly sensitive carbon dioxide(CO_(2))sensor based on light-induced thermoelastic spectroscopy(LITES)utilizing a selfdesigned low-frequency quartz tuning fork(QTF)and a fiber-coupled multipass cell(MPC)is reported in this paper.The QTF with a low resonant frequency of 8675 Hz and a high Q factor of 11,675.64 was used to improve its energy accumulation time and the sensor’s signal level.The MPC with the fiber-coupled structure and optical length of 40 m was adopted to significantly increase the gas absorbance and reduce the optical alignment difficulty as well as improve the robustness of the sensor system.A distributed feedback(DFB),near-infrared diode laser with an emission wavelength of 1.57μm was used as an excitation source.The experimental results showed that this CO_(2)-LITES sensor had an excellent linear response to CO_(2) concentrations.The minimum detection limitation(MDL)of this CO_(2)-LITES sensor was obtained to be 445.91 ppm,and it could be improved to 47.70 ppm(parts per million)when the integration time of the system reached 500 s.Further improvement methods for the detection performance of such sensors were also discussed.

关 键 词：carbon dioxide quartz tuning fork multipass cell light-induced thermoelastic spectroscopy 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]