[1] Yao R. Research on fiber optic sensing system of C2H2 based on near-infrared spectrum absorption[D]. Harbin: Harbin Engineering University(2014).

[2] Wu T, Xu D, He X D et al. Off-axis integrated cavity output spectroscopy technique based on wavelength modulation[J]. Acta Optica Sinica, 37, 0830002(2017).

[3] He Q X. Research on gas detection system based on infrared laser absorption spectroscopy technique[D]. Changchun: Jilin University(2018).

[4] Zheng K Y, Zheng C T, He Q X et al. Near-infrared acetylene sensor system using off-axis integrated-cavity output spectroscopy and two measurement schemes[J]. Optics Express, 26, 26205-26216(2018).

[5] Bakhirkin Y A, Kosterev A A, Roller C et al. Mid-infrared quantum cascade laser based off-axis integrated cavity output spectroscopy for biogenic nitric oxide detection[J]. Applied Optics, 43, 2257-2266(2004).

[6] Zhao W X. Integrated cavity output spectroscopy and its application Hefei: Hefei Institute of Physical Science,[D]. Chinese Academy of Sciences(2008).

[7] Chen Y, Chen Y W, Liu Z Q et al. A gear fault detection method based on a fiber Bragg grating sensor[J]. Chinese Journal of Lasers, 47, 0304007(2020).

[8] Wu Q, Zhang R. Wavelet denoising of near-earth all-day star map based on local outlier factor[J]. Acta Optica Sinica, 40, 0810001(2020).

[9] Zhao X, Yang H M, Qiang J et al. High-precision coherent laser ranging method based on Kalman filtering[J]. Acta Optica Sinica, 40, 1412001(2020).

[10] Hu X Y, Peng S L, Hwang W L. EMD revisited: a new understanding of the envelope and resolving the mode-mixing problem in AM-FM signals[J]. IEEE Transactions on Signal Processing, 60, 1075-1086(2012).

[11] Meng Y X, Liu T G, Liu K et al. A modified empirical mode decomposition algorithm in TDLAS for gas detection[J]. IEEE Photonics Journal, 6, 1-7(2014).

[12] Xu J C, Jiang H Y, Xu L S et al. Pulse wave processing and analysis based on smoothing filter. C]∥The 9th National Information Gathering and Processing Meeting, August 6, 2011, Shenyang, Liaoning, China. Beijing: Chinese Instrument and Control Society, 338-341(2011).

[13] Wei X L, Lin R L, Liu S Y et al. Denoising for chaotic signals based on the improved wavelet transform and S-G method[J]. Journal of Harbin Engineering University, 37, 376-381(2016).

[14] Zheng K Y, Zheng C T, Liu Z D et al. Near-infrared broadband cavity-enhanced sensor system for methane detection using a wavelet-denoising assisted Fourier-transform spectrometer[J]. The Analyst, 143, 4699-4706(2018).

[15] Yao D, Zheng K Y, Liu Z D et al. Wavelet denoising in near-infrared broadband cavity-enhanced absorption spectroscopy[J]. Acta Optica Sinica, 39, 0930006(2019).

[16] Liu H J, Liu S G, Li M. EMD and wavelet threshold denoising method of gear-shift acceleration signals[J]. Noise and Vibration Control, 38, 198-203(2018).

[17] Li R X, Fu H C, Xia M et al. Signal processing of electronic belt scale based on adaptive Kalman filter[J]. Techniques of Automation and Applications, 38, 73-76, 84(2019).

[18] Zhou Y W, Miao S Z, Yao D et al. Laser methane remote sensor system based on wavelength modulation spectroscopy and wavelet denoising[J]. Chinese Journal of Lasers, 47, 0611001(2020).