title: Note: Dissolved hydrogen detection in power transformer oil based on chemically etched fiber Bragg grating.
abstract: A fiber Bragg grating (FBG) sensor based on chemically etched cladding to detect dissolved hydrogen is proposed and studied in this paper. Low hydrogen concentration tests have been carried out in mixed gases and transformer oil to investigate the repeatability and sensitivity. Moreover, to estimate the influence of etched cladding thickness, a physical model of FBG-based hydrogen sensor is analyzed. Experimental results prove that thin cladding chemically etched by HF acid solution improves the response to hydrogen detection in oil effectively. At last, the sensitivity of FBG sensor chemically etched 16 μm could be as high as 0.060 pm/(μl/l), increased by more than 30% in comparison to un-etched FBG.
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Guo-ming
authors.initials: GM
authors.lastname: Ma
authors.affiliation: Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Hong-tu
authors.initials: HT
authors.lastname: Song
authors.affiliation: Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Hong-yang
authors.initials: HY
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Cheng-rong
authors.initials: CR
authors.lastname: Li
authors.affiliation: Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, People's Republic of China.
authors.forename: Ying-ting
authors.initials: YT
authors.lastname: Luo
authors.affiliation: Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, People's Republic of China.
authors.forename: Hong-bin
authors.initials: HB
authors.lastname: Wang