首页|A highly sensitive LITES sensor based on a multi-pass cell with dense spot pattern and a novel quartz tuning fork with low frequency
A highly sensitive LITES sensor based on a multi-pass cell with dense spot pattern and a novel quartz tuning fork with low frequency
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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.
Yahui Liu、Shunda Qiao、Chao Fang、Ying He、Haiyue Sun、Jian Liu、Yufei Ma
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National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150000,China
Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450000,China
Advanced Microscopy and Instrumentation Research Center,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150080,China
国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Key Laboratory of Opto-Electronic In-formation Acquisition and Manipulation(Anhui University)教育部项目中央高校基本科研业务费专项
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