Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Detection of Hydrogen Gas Dissolved in Insulation Oil Based on Palladium-coated Fiber Bragg Grating

팔라듐이 코팅된 광섬유 격자를 이용한 절연유속의 용존 수소가스 검출

  • Received : 2018.08.14
  • Accepted : 2018.11.27
  • Published : 2018.11.30
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Abstract

We have investigated a fiber-optic sensor for detecting the hydrogen gas dissolved in insulation oil based on a palladium (Pd)-coated fiber Bragg grating (FBG). As the palladium absorbs the hydrogen gas dissolved in the insulation oil, its volume expands and the Bragg wavelength shifts to a longer wavelength. The experimental results showed that the Bragg wavelength of FBG increased to 70 nm when the concentration of hydrogen dissolved in the insulation oil was 409 ppm.

Keywords

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Fig. 1. Hydrogen sensor structure using Pd coated FBG.

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Fig. 2. Picture of optical fiber before and after etching.

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Fig. 3. Scanning Electron Microscope (SEM) of Pd film coated on optical fiber.

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Fig. 4. Experimental set-up to test hydrogen detection in insulation oil using a FBG.

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Fig. 5. Bragg wavelength shift in accordance with hydrogen insertion time in insulation oil.

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Fig. 6. Reflection spectrum of palladium coated fiber Bragg grating before and after hydrogen insertion in insulation oil. (a) 30 mm of cladding diameter device. (b) 125 mm of cladding diameter.

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