[1] Cao Y L, Ye Q, Cai H W. On-line temperature monitoring in railway existing fiber cable based on Brillouin optical Time-domain reflectometry[J]. Laser & Optoelectronics Progress, 53, 080602(2016).

[2] Lü J G, Wei C T. Fitting algorithm for BOTDA Brillouin back scattered-light spectrum data[J]. Optical Technique, 41, 380-384(2015).

[3] Li D. The key signal processing technology of BOTDR distributed sensing systems[D]. Qinhuangdao: Yanshan University, 25-30(2013).

[4] Yu C J. Research on high accuracy extraction of BOTDR distributed sensor signal[D]. Qinhuangdao:Yanshan University, 25-42(2015).

[5] Zhang Y J, Liu W Z, Fu X H et al. The high precision analysis research of multichannel BOTDR scattering spectral information based on the TTDF and CNS algorithm[J]. Spectroscopy and Spectral Analysis, 35, 1802-1807(2015).

[6] Zhang Y J, Liu W Z, Fu X H et al. A Brillouin scattering spectrum feature extraction based on flies optimization algorithm with adaptive mutation and generalized regression neural network[J]. Spectroscopy and Spectral Analysis, 35, 2916-2923(2015).

[7] Horiguchi T, Shimizu K, Kurashima T et al. Development of a distributed sensing technique using Brillouin scattering[J]. Journal of Lightwave Technology, 13, 1296-1302(1995). http://www.emeraldinsight.com/servlet/linkout?suffix=b7&dbid=16&doi=10.1108%2F02602280910936237&key=10.1109%2F50.400684

[8] Zheng HR, Fang Z J, Wang Z Y et al. Brillouin frequency shift of fiber distributed sensors extracted from noisy signals by quadratic fitting[J]. Sensors, 18, 409(2018). http://www.ncbi.nlm.nih.gov/pubmed/29385052

[9] Liang H, Zhang X P, Li X H et al. Design and implementation of data fitting algorithm for Brillouin back scattered-light spectrum data[J]. Acta Photonica Sinica, 38, 875-879(2009).

[10] Wang F, Zhan W W, Lu Y G et al. Determining the change of Brillouin frequency shift by using the similarity matching method[J]. Journal of Lightwave Technology, 33, 4101-4108(2015). http://ieeexplore.ieee.org/document/7214198/

[11] Farahani M A, Castillo-Guerra E, Colpitts B G. Accurate estimation of Brillouin frequency shift in Brillouin optical time domain analysis sensors using cross correlation[J]. Optics Letters, 36, 4275-4277(2011). http://www.ncbi.nlm.nih.gov/pubmed/22048389

[12] Farahani M A, Castillo-Guerra E, Colpitts B G. A detailed evaluation of the correlation-based method used for estimation of the Brillouin frequency shift in BOTDA sensors[J]. IEEE Sensors Journal, 13, 4589-4598(2013). http://ieeexplore.ieee.org/document/6547687/

[13] Shang Q F, Hu Y T, Liu W. Feature extraction of Brillouin scattering spectrum based on cross-correlation convolution and high-order centroid calculation[J]. Chinese Journal of Lasers, 44, 1106011(2017).

[14] Agrawal G P. Nonlinear fiber optics[M]. Heidelberg: Springer, 195-211(2000).

[15] Xiao S H, Li L. Analytical model of Brillouin scattering spectrum measurements in fibre-optic distributed sensing systems[J]. Journal of Southwest Jiaotong University, 44, 946-950(2009).

[16] New fitting method for Brillouin-based scattering spectrum of fibre-optic distributed sensing systems[J]. Optical Technique, 35, 897-900, 904(2009).

     Xiao S H, Xiao S H, Li L. New fitting method for Brillouin-based scattering spectrum of fibre-optic distributed sensing systems[J]. Optical Technique, 35, 897-900,904(2009).

[17] Ida T, Ando M, Toraya H. Extended pseudo-voigt function for approximating the voigt profile[J]. Journal of Applied Crystallography, 33, 1311-1316(2000). http://onlinelibrary.wiley.com/doi/10.1107/S0021889800010219/citedby

[18] Jia W. The multi-peak spectrum feature extraction technology research of BOTDR distributed optical sensing systems[D]. Qinhuangdao: Yanshan University, 18-31(2015).

[19] Zhang Y J, Jin P J. Fu X H et al. Feature extraction of multi-peak Brillouin scattering spectrum based on SFLA-LSSVM algorithm[J]. Chinese Journal of Lasers, 45, 0106004(2018).

[20] Liu Y P, Tian Y, Jiang S et al. Effect of optical fiber sheath on thermal ageing characteristics of transformer oil[J]. Insulating Materials, 50, 54-59(2017).