Study on High Sensitive Detection of Acetylene Trace Gas Based on QEPAS
MA Yu-fei1,2, TONG Yao1, ZHANG Li-gong1, HE Ying1, ZHANG Jing-bo1, WANG Long1, LONG Jin-hu1, YU Xin1, SUN Rui2
1. State Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
2. Post-doctoral Mobile Station of Power Engineering and Engineering Thermophysics, Harbin Institute of Technology, Harbin 150001, China
Abstract：Quartz-enhanced photoacoustic spectroscopy (QEPAS) technology invented lately uses a commercially available mm sized piezoelectric quartz tuning fork (QTF) as an acoustic wave transducer. A high Q-factor and a ~30 kHz resonance frequency of the QTF improve QEPAS selectivity and immunity to environmental acoustic noise. QEPAS sensor has the advantages of high sensitivity, selectivity and compactness. Acetylene (C2H2), a toxic and harmful gas, has great significance in high sensitive detection in many fields such as the detection of fault gases in transformers and environmental monitoring. In this paper, QEPAS technology was employed to detect C2H2. A continuous-wave distributed feedback (DFB) single mode diode laser emitting at 1.53 μm was used as the exciting source. In order to reduce the sensor background noise and simplify the data process, a wavelength modulation spectroscopy and a 2nd harmonic detection technique were employed. To increase the QEPAS signal amplitude, unlikely the usually used quartz tuning fork (QTF) with resonance frequency of 32.768 kHz, a novel QTF with 30.72 kHz was adopted as the acoustic wave tranducer. The position between laser beam and QTF and the laser wavelength modulation depth were optimized. In the meanwhile, micro-resonator was added into the QEPAS sensor system, and the length and inner diameter of the mR tubes were selected to be 4 mm and 0.5 mm, respectively. Finally, a 2.7 ppm minimum detection limit was obtained, and the corresponding normalized noise equivalent absorption (NNEA) coefficient was 1.3×10-8 cm-1·W·Hz-1/2.
马欲飞，佟 瑶，张立功，何 应，张静波，王 龙，龙金虎，于 欣，孙 锐. 基于QEPAS技术的乙炔微量气体高灵敏度检测研究[J]. 光谱学与光谱分析, 2017, 37(09): 2869-2872.
MA Yu-fei, TONG Yao, ZHANG Li-gong, HE Ying, ZHANG Jing-bo, WANG Long, LONG Jin-hu, YU Xin, SUN Rui. Study on High Sensitive Detection of Acetylene Trace Gas Based on QEPAS. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(09): 2869-2872.
[1] Marshall S T, Schwartz D K, Medlin J W. Sensors and Actuators B, 2009, 136: 315.
[2] Miller K L, Morrison E, Marshall S T, et al. Sensors and Actuators B, 2011, 156: 924.
[3] Chen W G, Zhou Q, Su X P, et al. Sensors & Transducers, 2013, 154: 195.
[4] Kosterev A A, Bakhirkin Y A, Curl R F, et al. Optics Letters, 2002, 27: 1902.
[5] Ma Y F, Lewicki R, Razeghi M, et al. Optics Express, 2013, 21: 1008.
[6] Ma Y F, Yu X, Yu G, et al. Applied Physics Letters, 2015, 107: 021106.
[7] Dong L, Spagnolo V, Lewicki R, et al. Optics Express, 2012, 19: 24037.
[8] Liu K, Guo X, Yi H, et al. Optics Letters, 2009, 34: 1594.
[9] Wu H P, Dong L, Zheng H D, et al. Sensors and Actuators B, 2015, 221: 666.
[10] Liu K, Zhao W X, Wang L, et al. Optics Communication, 2015, 340: 126.
