[1] Willsch R. Application of optical fiber sensors: technical and market trends[J]. Proceedings of SPIE, 4074, 24-31(2000).

[2] Dong L, Archambault J L, Reekie L et al. Single pulse Bragg gratings written during fibre drawing[J]. Electronics Letters, 29, 1577-1578(1993).

[3] Askins C G, Putnam M A, Williams G M et al. Stepped-wavelength optical-fiber Bragg grating arrays fabricated in line on a draw tower[J]. Optics Letters, 19, 147-149(1994).

[4] Chojetzki C, Rothhardt M W, Ommer J et al. High-reflectivity draw-tower fiber Bragg gratings: arrays and single gratings of type II[J]. Optical Engineering, 44, 060503(2005).

[5] Rothhardt M, Becker M, Chojetzki C et al. Strain sensor chains beyond 1000 individual fiber Bragg gratings[C], JThA53(2010).

[6] Yu H H, Zheng Y, Guo H Y et al. Research progress in online preparation techniques of fiber Bragg gratings on optical fiber drawing tower[J]. Journal of Functional Materials, 45, 12001-12005(2014).

[7] Huang J B, Ding P, Tang J S. Progress in fabrication, demondulation and application of weak fiber Bragg grating array[J]. Laser & Optoelectronics Progress, 58, 1700005(2021).

[8] Guo H Y, Tang J G, Li X F et al. On-line writing identical and weak fiber Bragg grating arrays[J]. Chinese Optics Letters, 11, 030602(2013).

[9] Guo H Y, Qian L, Zhou C M et al. Crosstalk and ghost gratings in a large-scale weak fiber Bragg grating array[J]. Journal of Lightwave Technology, 35, 2032-2036(2017).

[10] Wang Y M, Gong J M, Dong B et al. A large serial time-division multiplexed fiber Bragg grating sensor network[J]. Journal of Lightwave Technology, 30, 2751-2756(2012).

[11] Hu C Y, Wen H Q, Bai W. A novel interrogation system for large scale sensing network with identical ultra-weak fiber Bragg gratings[J]. Journal of Lightwave Technology, 32, 1406-1411(2014).

[12] Ma L M, Ma C, Wang Y M et al. High-speed distributed sensing based on ultra weak FBGs and chromatic dispersion[J]. IEEE Photonics Technology Letters, 28, 1344-1347(2016).

[13] Zhou L, Li Z, Xiang N et al. High-speed demodulation of weak fiber Bragg gratings based on microwave photonics and chromatic dispersion[J]. Optics Letters, 43, 2430-2433(2018).

[14] Wang C, Shang Y, Liu X H et al. Distributed OTDR-interferometric sensing network with identical ultra-weak fiber Bragg gratings[J]. Optics Express, 23, 29038-29046(2015).

[15] Liu T, Wang F, Zhang X P et al. Interrogation of ultra-weak FBG array using double-pulse and heterodyne detection[J]. IEEE Photonics Technology Letters, 30, 677-680(2018).

[16] Shan Y Y, Ji W B, Dong X Y et al. An enhanced distributed acoustic sensor based on UWFBG and self-heterodyne detection[J]. Journal of Lightwave Technology, 37, 2700-2705(2019).

[17] Muanenda Y, Faralli S, Oton C J et al. Dynamic phase extraction in high-SNR DAS based on UWFBGs without phase unwrapping using scalable homodyne demodulation in direct detection[J]. Optics Express, 27, 10644-10658(2019).

[18] Luo Z H, Wen H Q, Guo H Y et al. A time- and wavelength-division multiplexing sensor network with ultra-weak fiber Bragg gratings[J]. Optics Express, 21, 22799-22807(2013).

[19] Gao Y H. Study on optimal operation of direct air cooling units of thermal power plant[D], 6-14(2018).

[20] Ding P, Wu J, Kang D et al. Detection of acoustic wave direction using weak-reflection fiber Bragg gratings[J]. Chinese Journal of Lasers, 47, 0506002(2020).

[21] Jiang T, Wang Y T, Wang S Q et al. Field test of fire alarming system for cable tunnel based on distributed fiber grating array sensing technology[J]. Transportation Science & Technology, 171-174(2018).

[22] Zhu D F, Wang Y J, Yang Y et al. Urban rail train positioning and speed measuring method based on grating array[J]. Acta Photonica Sinica, 48, 159-166(2019).

[23] Gan W B, Li S, Li Z Y et al. Identification of ground intrusion in underground structures based on distributed structural vibration detected by ultra-weak FBG sensing technology[J]. Sensors, 19, 2160(2019).

[24] Nan Q, Li S, Yao Y et al. A novel monitoring approach for train tracking and incursion detection in underground structures based on ultra-weak FBG sensing array[J]. Sensors, 19, 2666(2019).