[1] [1] AfzalA, CioffiN, SabbatiniL, et al. NOx sensors based on semiconducting metal oxide nanostructures: progress and perspectives[J].Sensors and Actuators B:Chemical, 2012, 171/172: 25- 42.

[2] Ramgir N S, Goyal C P, Sharma P K et al. Selective H2S sensing characteristics of CuO modified WO3 thin films[J]. Sensors and Actuators B: Chemical, 188, 525-532(2013). http://www.sciencedirect.com/science/article/pii/S0925400513008496

[3] Dai J X, Peng W, Wang G P et al. Ultra-high sensitive optical fiber hydrogen sensor using self-referenced demodulation method and WO3-Pd2Pt-Pt composite film[J]. Optics Express, 25, 2009-2015(2017). http://www.ncbi.nlm.nih.gov/pubmed/29519049

[4] Yamaguchi Y, Imamura S, Nishio K et al. Influence of temperature and humidity on the electrical sensing of Pt/WO3 thin film hydrogen gas sensor[J]. Journal of the Ceramic Society of Japan, 124, 629-633(2016).

[5] Esfandiar A, Irajizad A, Akhavan O et al. Pd-WO3/reduced graphene oxide hierarchical nanostructures as efficient hydrogen gas sensors[J]. International Journal of Hydrogen Energy, 39, 8169-8179(2014).

[6] Caucheteur C, Debliquy M, Lahem D et al. Hybrid fiber gratings coated with a catalytic sensitive layer for hydrogen sensing in air[J]. Optics Express, 16, 16854-16859(2008). http://www.opticsinfobase.org/abstract.cfm?uri=oe-16-21-16854

[7] Dai J X, Yang M H, Yang Z et al. Performance of fiber Bragg grating hydrogen sensor coated with Pt-loaded WO3 coating[J]. Sensors and Actuators B: Chemical, 190, 657-663(2014). http://www.sciencedirect.com/science/article/pii/S0925400513010198

[8] Liao C R, He J, Wang Y P. Study on high temperature sensors based on fiber Bragg gratings fabricated by femtosecond laser[J]. Acta Optica Sinica, 38, 0328009(2018).

[9] Hu W J, Xu B, Shi Y et al. Flow sensor with high sensitivity fabricated by femtosecond laser[J]. Chinese Journal of Lasers, 45, 0902001(2018).

[10] Cao H J, Si J H, Chen T et al. Temperature and strain dual-parameter heterogeneous fiber Bragg grating sensor made by femtosecond laser[J]. Chinese Journal of Lasers, 45, 0702009(2018).

[11] Okazaki S, Nakagawa H, Asakura S et al. Sensing characteristics of an optical fiber sensor for hydrogen leak[J]. Sensors and Actuators B: Chemical, 93, 142-147(2003). http://www.sciencedirect.com/science/article/pii/S0925400503002119

[12] Song H, Chen Y P, Zhang G et al. Optical fiber hydrogen sensor based on an annealing-stimulated Pd-Y thin film[J]. Sensors and Actuators B: Chemical, 216, 11-16(2015). http://www.sciencedirect.com/science/article/pii/S0925400515004347

[13] Silva S, Coelho L, Almeida J M et al. H2 sensing based on a Pd-coated tapered-FBG fabricated by DUV femtosecond laser technique[J]. IEEE Photonics Technology Letters, 25, 401-403(2013).

[14] Dai J X, Yang M H, Yu X et al. Greatly etched fiber Bragg grating hydrogen sensor with Pd/Ni composite film as sensing material[J]. Sensors and Actuators B: Chemical, 174, 253-257(2012). http://www.sciencedirect.com/science/article/pii/S0925400512006983

[15] Zhou X, Dai Y T, Zou M et al. FBG hydrogen sensor based on spiral microstructure ablated by femtosecond laser[J]. Sensors and Actuators B: Chemical, 236, 392-398(2016). http://www.sciencedirect.com/science/article/pii/S0925400516308796

[16] Cao Y Z[M]. Heat transfer theory(2001).

[17] Dai S S[M]. Reliability tests and statistical analysis(1984).

[18] Appel C, Mantzaras J, Schaeren R et al. Catalytic combustion of hydrogen-air mixtures over platinum: validation of hetero/homogeneous chemical reaction schemes[J]. Clean Air: International Journal on Energy for a Clean Environment, 5, 21-44(2004).

[19] Zhong X X, Yang M H, Huang C J et al. Water photolysis effect on the long-term stability of a fiber optic hydrogen sensor with Pt/WO3[J]. Scientific Reports, 6, 39160(2016). http://europepmc.org/articles/PMC5155222/