[1] Ju TANG, Xu YANG, Dong YANG et al. Using SF6 decomposed component analysis for the diagnosis of partial discharge severity initiated by free metal particle defect. Energies, 10, 1119(2017).

[2] Ruyue CUI, Lei DONG, Hongpeng WU et al. Highly sensitive and selective CO sensor using a 233 μm diode laser and wavelength modulation spectroscopy. Optics Express, 26, 24318(2018).

[3] Wei PENG. Comparison of the application of my country's SF6 gas standard and IEC related standards. Electric Power Equipment, 61-63(2008).

[4] Fengxiang MA, Yu TIAN, Ke CHEN et al. Detection technology of H2S and CO2 based on fiber amplifier enhanced photoacoustic spectroscopy. Acta Optics Sinica, 41, 0730002(2021).

[5] Xiaoxing ZHANG, Yin ZHANG, Ju TANG et al. Optical technology for detecting the decomposition products of SF6: a review. Optical Engineering, 57, 110901(2018).

[6] Changlei LIU. Application of gas chromatography in gas safety analysis of petrochemical enterprises. Qilu Petrochemical, 44, 243-245(2016).

[7] J OLTHOFF, J VANBRYNT, T HERRON et al. Detection of trace disulfur decafluoride in sulfur hexafluoride by gas chromatography/mass spectrometry. Analytical Chemistry, 63, 726-732(1991).

[8] Changlun CHEN, Jianbo HE, Wei LIU et al. Research progress of electrochemical gas sensors. Sensor World, 11-15(2004).

[9] Ming DONG, Chongxing ZHANG, Ming REN et al. Electrochemical and infrared absorption spectroscopy detection of SF6 decomposition products. Sensors, 17, 2627(2017).

[10] Xukun YIN, Lei DONG, Hongping WU et al. Sub-ppb nitrogen dioxide detection with a large linear dynamic range by use of a differential photoacoustic cell and a 3.5W blue multimode diode laser. Sensors and Actuators B: Chemical, 247, 329-335(2017).

[11] Huadan ZHENG, Minhan LOU, Lei DONG et al. Compact photoacoustic module for methane detection incorporating interband cascade light emitting device. Optics Express, 25, 16761-16770(2017).

[12] Ke CHEN, Bo ZHANG, Min GUO et al. All-optical photoacoustic multigas analyzer using digital fiber-optic acoustic detector. IEEE Transactions on Instrumentation and Measurement, 69, 8486-8493(2020).

[13] Ke CHEN, Bo ZHANG, Shuai LIU et al. Parts-per-billion-level detection of hydrogen sulfide based on near-infrared all-optical photoacoustic spectroscopy. Sensors and Actuators B: Chemical, 283, 1-5(2019).

[14] Zhaolun CUI, Xiaoxing ZHANG, Zheng CHENG et al. Quantitative analysis of SO2, H2S and CS2 mixed gases based on ultraviolet differential absorption spectrometry. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 215, 187-195(2019).

[15] Jin LUO, Yonghua FANG, Yandong ZHAO et al. Research on the detection of SF6 decomposition products based on non-resonant photoacoustic spectroscopy. Analytical Methods, 7, 1200-1207(2015).

[16] Fengxiang MA, Yu TIAN, Ke CHEN et al. Detection technology of H2S and CO2 based on optical fiber amplification enhanced photoacoustic spectroscopy. Acta Optics Sinica, 41, 0703002(2017).

[17] CHA Shenlong, Kun LIU, Tu TAN et al. Application of photoacoustic spectroscopy in multi-component gas concentration detection. Acta Photonica Sinica, 46, 0612002(2017).

[18] Rong YU, Yuesong JIANG. Photoacoustic spectroscopy system with amplitude spectrum and phase spectrum measurement functions. Acta Optica Sinica, 34, 0230001(2014).

[19] Qiang WANG, Ke XU, Yuchen YAO et al. Recent advances of power-enhanced photoacoustic spectroscopy for gas sensing. Chinese Journal of Lasers, 45, 0911008(2018).

[20] Shuai YUAN, Guangzhen WANG, Dehui FU et al. Cross interference characteristics of photoacoustic spectroscopy multi-gas analyzer. Acta Photonica Sinica, 50, 0430002(2021).

[21] Shutao WANG, Rensheng CHE, Yutian WANG et al. Research on optical fiber gas sensor based on photoacoustic spectroscopy. China Journal of Laser, 31, 979-982(2004).

[22] Hongping WU, Lei DONG, Huadan ZHENG et al. Enhanced near-infrared QEPAS sensor for sub-ppm level H2S detection by means of a fiber amplified 1 582 nm DFB laser. Sensors and Actuators B: Chemical, 221, 666-672(2015).

[23] Xiaoxing ZHANG, Zheng CHENG, Xin LI. Cantilever enhanced photoacoustic spectrometry: quantitative analysis of the trace H2S produced by SF6 decomposition. Infrared Physics & Technology, 78, 31-39(2016).

[24] Xukun YIN, Lei DONG, Hongfu WU et al. Ppb-level H2S detection for SF6 decomposition based on a fiber-amplified telecommunication diode laser and a background-gas-induced high- Q photoacoustic cell. Applied Physics Letters, 111, 031109(2017).

[25] Xukun YIN, Lei DONG, Hongping WU et al. Highly sensitive photoacoustic multicomponent gas sensor for SF6 decomposition online monitoring. Optics Express, 27, A224(2019).

[26] Ke CHEN, Shuai YUAN, Zhenfeng GONG et al. High sensitive detection for SF6 decomposition component of H2S based on laser photoacoustic spectroscopy. Chinese Journal of Lasers, 45, 0911012(2018).

[27] Ke CHEN, Bo ZHANG, Shuai LIU et al. Parts-per-billion-level detection of hydrogen sulfide based on near-infrared all-optical photoacoustic. Sensors and Actuators B: Chemical, 283, 1-5(2019).

[28] Nan ZHAO, Yang LIU, Ningyang ZHAO et al. Establishment and optimization of photoacoustic cell model in photoacoustic spectrum detection system. Acta Photonica Sinica, 50, 0730001(2021).

[29] Ke CHEN, Beilei YANG, Min GUO et al. Fiber-optic photoacoustic gas sensor with temperature self-compensation. Optics Letters, 45, 2458-2461(2020).

[30] Ke CHEN, Zhihao YU, Zhenfeng GONG et al. Lock-in white-light-interferometry-based all-optical photoacoustic spectrometer. Optics Letters, 43, 5038-5041(2018).

[31] Ke CHEN, Min GUO, Beilei YANG et al. Highly sensitive optical fiber photoacoustic sensor for in situ detection of dissolved gas in oil. IEEE Transactions on Instrumentation & Measurement, 70, 1-8(2021).

[32] Xinyu ZHAO, Ke CHEN, Dongyu CUI et al. Ultra-high sensitive photoacoustic gas detector based on differential multi-pass cell. Sensors and Actuators B: Chemical, 368, 132124(2022).

[33] D HERRIOTT, H KOGELNIK, R KOMPFNER. Off-axis paths in spherical mirror interferometers. Applied Optics, 3, 523-526(1964).

[34] Zhenxi ZHANG, Hongguang ZHOU, Xufei CHEN et al. Design method of variable optical path length multi-pass cell. Applied Physics B, 127, 12(2021).