A highly sensitive LITES sensor based on a multi-pass cell with dense spot pattern and a novel quartz tuning fork with low frequency  

作　　者：Yahui Liu Shunda Qiao Chao Fang Ying He Haiyue Sun Jian Liu Yufei Ma 

机构地区：[1]National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150000,China [2]Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450000,China [3]Advanced Microscopy and Instrumentation Research Center,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150080,China.

出　　处：《Opto-Electronic Advances》2024年第3期26-34,共9页光电进展（英文）

基　　金：National Natural Science Foundation of China(Grant Nos.62335006,62022032,62275065,and 61875047);Key Laboratory of Opto-Electronic Information Acquisition and Manipulation(Anhui University),Ministry of Education(Grant No.OEIAM202202);Fundamental Research Funds for the Central Universities(Grant No.HIT.OCEF.2023011).

摘　　要：A highly sensitive light-induced thermoelectric spectroscopy(LITES)sensor based on a multi-pass cell(MPC)with dense spot pattern and a novel quartz tuning fork(QTF)with low resonance frequency is reported in this manuscript.An erbi-um-doped fiber amplifier(EDFA)was employed to amplify the output optical power so that the signal level was further enhanced.The optical path length(OPL)and the ratio of optical path length to volume(RLV)of the MPC is 37.7 m and 13.8 cm^(-2),respectively.A commercial QTF and a self-designed trapezoidal-tip QTF with low frequency of 9461.83 Hz were used as the detectors of the sensor,respectively.The target gas selected to test the performance of the system was acetylene(C2H2).When the optical power was constant at 1000 mW,the minimum detection limit(MDL)of the C2H2-LITES sensor can be achieved 48.3 ppb when using the commercial QTF and 24.6 ppb when using the trapezoid-al-tip QTF.An improvement of the detection performance by a factor of 1.96 was achieved after replacing the commer-cial QTF with the trapezoidal-tip QTF.

关 键 词：light-induced thermoelectric spectroscopy quartz tuning fork multi-pass cell gas sensing 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]