Fiber bragg grating hydrogen sensing system based on amorphous palladium-based alloy and sensor
A sensing system and fiber grating technology, applied in the field of hydrogen sensors, can solve the problems of fiber grating strain and temperature cross-sensitivity, large loss of coreless fiber, decreased accuracy, etc., to improve hydrogen embrittlement phenomenon, strong hydrogen permeability, The effect of low production cost
Inactive Publication Date: 2021-02-05
安徽伯华氢能源科技有限公司
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Abstract
The invention discloses a fiber bragg grating hydrogen sensing system based on amorphous palladium-based alloy. The fiber bragg grating hydrogen sensing system is formed by welding a first fiber bragggrating and a second fiber bragg grating which have different central wavelengths in series, wherein the surface of the second fiber bragg grating is coated with a sensing film layer to form a hydrogen sensitive probe, and the sensing film layer is an amorphous palladium-based alloy film. Byutilizing the principle that the stress and the refractive index are changed after the sensing film layer absorbs hydrogen, the hydrogen concentration in the environment is converted into the offset of the central wavelength of a substrate, and the material has both the reversible hydrogen absorption performance of metal palladium and the excellent hydrogen permeability of amorphous alloy, so that the stability and sensitivity of a sensing system can be greatly improved. The surface of the first grating is exposed and used for temperature measurement and temperature compensation, and the inherent temperature cross sensitivity problem of the fiber grating sensor is eliminated. Aiming at the type ofthe second grating, the invention further provides two sensors loading the hydrogen sensing system based on reflection and transmission spectra respectively.
Application Domain
Material analysis by optical meansConverting sensor output optically
Technology Topic
Alloy thin filmTransmittance spectra +6
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PUM
Property | Measurement | Unit |
Thickness | 1.0 ~ 80.0 | µm |
Thickness | 0.0 ~ 20.0 | µm |
Thickness | 0.0 ~ 100.0 | nm |
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