Hydrogen concentration and environmental temperature double-parameter measuring device based on tilted fiber bragg grating

The invention belongs to the technical field of sensing, and particularly relates to a hydrogen concentration and environmental temperature double-parameter measuring device based on a tilted fiber bragg grating. The device comprises a light source, the tilted fiber bragg grating plated with a palladium-sliver alloy film, single mode fibers and a spectrometer, wherein the light source is connected with the tilted fiber bragg grating plated with the palladium-sliver alloy film through the single mode fibers, and the other end of the grating is connected onto the spectrometer through the single mode fibers. When the device is located in a hydrogen environment, the palladium-sliver alloy film can absorb hydrogen in the environment to cause the evanescent field of optical fibers to change. Evanescent waves of the evanescent field resonate with surface plasma waves produced by metal surface free electrodes to produce a harmonic peak. The hydrogen concentration can be measured by using the interval between the plasma harmonic peak and a bragg harmonic peak. The bragg harmonic peak of the tilted fiber bragg grating is sensitive to temperatures, so that the plasma harmonic peak and the bragg harmonic peak of the tilted fiber bragg grating can be used for realizing double-parameter measurement of the hydrogen concentration and temperatures.