Pressure sensor using fiber Bragg grating

Abstract

The invention discloses a pressure sensor using a fiber Bragg grating, and relates to a pressure sensor. The pressure sensor is provided with a sensor protective shell, a copper hollow elbow, a pipeline interface, a copper metal block, an upper metal protective sleeve, a lower metal protective sleeve, a fiber Bragg grating and an optical fiber protective sleeve, wherein the sensor protective shellis arranged on the peripheries of the copper hollow elbow, the pipeline interface, the copper metal block, the upper metal protective sleeve, the lower metal protective sleeve and the fiber Bragg grating; the copper hollow elbow is connected with the pipeline interface; the upper metal protective sleeve and the lower metal protective sleeve are connected with a tail end of the copper hollow elbowand the copper metal block respectively; the fiber Bragg grating is connected with an upper port of the copper hollow elbow and one end of the copper metal block respectively; and the optical fiber protective sleeve is arranged on the top of the sensor protective shell. Through the non-sticking scheme, the linear change of the central wavelength of the grating in a strain process can be better ensured in order to obtain more accurate measurement values.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to a pressure sensor using an optical fiber grating that changes the strain of the optical fiber grating through changes in liquid or gas pressure. Background technique [0002] The fiber grating is realized by introducing periodic refractive index changes in the core region of the fiber by ultraviolet laser irradiation. When the change period of the refractive index in the core area of ​​the single-mode fiber is small, the fundamental mode of the forward transmission can be coupled with the fundamental mode of the backward transmission and transfer most of the power. This kind of fiber grating is called fiber Bragg grating (fiber Bragg grating, FBG) grating, and the wavelength of light satisfying this energy conversion or resonance is called the Bragg wavelength of the fiber Bragg grating, or the center wavelength of the fiber Bragg grating. [0003] The traditional gas or liquid pressure meas...

AI Technical Summary

Problems solved by technology

The pressure can only be roughly read through the rotation of the pointer, and the pressure value cannot be collected and transmitted; the signal of the electronic pressure sensor needs to be collected and transmitted by the corresponding circuit. In the case of complex wiring, flammable and explosive environments, and long signal transmission distances, electronic pressure sensors have great difficulties in practical applications.

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