Dual-parameter measurement device for hydrogen concentration and ambient temperature based on tilted fiber grating

A technology of tilting fiber gratings and ambient temperature, which is applied in the field of sensing to achieve the effects of low cost, simple manufacturing process and strong operability
CN103822901BInactive Publication Date: 2016-06-22TIANJIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIVERSITY OF TECHNOLOGY
Publication Date
2016-06-22
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention belongs to the field of sensing technology, in particular to a dual-parameter measuring device for hydrogen concentration and ambient temperature based on an inclined optical fiber grating. It includes a light source, a tilted fiber grating coated with a palladium-silver alloy film, a single-mode fiber and a spectrometer. The light source is connected to a tilted fiber grating coated with a palladium-silver alloy film through a single-mode optical fiber, and the other end of the grating is connected to a spectrometer through a single-mode optical fiber. When the device is in a hydrogen environment, the palladium-silver alloy film will absorb hydrogen in the environment, causing changes in the evanescent field of the optical fiber. Its evanescent wave resonates with the surface plasmon wave generated by the free electrons on the metal surface, resulting in a resonance peak. The hydrogen concentration can be measured by using the interval between the plasma resonance peak and the Bragg resonance peak. The Bragg resonance peaks of tilted fiber gratings are sensitive to temperature. Therefore, we can use the plasmon resonance peak and Bragg resonance peak of the tilted fiber grating to realize the dual-parameter measurement of hydrogen concentration and temperature.
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Description

technical field

[0001] The invention belongs to the field of sensing technology, in particular to a dual-parameter measuring device for hydrogen concentration and ambient temperature based on an inclined optical fiber grating. It is a device capable of measuring the concentration of hydrogen in the environment and the dual parameters of the ambient temperature. This not only reduces the cost of multi-parameter measurement, but also can effectively solve the problem of cross-sensitivity, which has important practical significance and broad application prospects. Background technique

[0002] Surface plasmon resonance (SPR, Surface Plasmon resonance) refers to the excitation of surface plasmons coupled with free electron density oscillations between metals and dielectrics (or air). Surface plasmon is a kind of TM polarized electromagnetic wave propagating along the interface of metal and insulating material. Its electromagnetic field decays exponentially and rapidly in both m...

Claims

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