FBG (fiber bragg grating) based pressure sensor and application thereof

Abstract

The invention discloses an FBG (fiber bragg grating) based pressure sensor and application thereof, and belongs to the technical field of optical fiber sensing. A support optical fiber and an optical fiber with an FBG-FP (Fabry-Perot) structure are parallelly clamped between two metal plates; the two metal plates completely cover two FBGs of the optical fiber with the FBG-FP structure to serve as a Fabry-Perot structure section of a reflection surface, and two ends of the optical fiber with the FBG-FP structure are arranged on the outer sides of the two metal plates respectively; the opposite surfaces of the two metal plates are smooth planes. The optical fiber with the FBG-FP structure serves as a measuring element, pressure applied to the outsides of the metal plates is transmitted to the measuring optical fiber through the metal plates, and the two ends of the optical fiber, with the FBG-FP structure, on the outer sides of the two metal plates can serve as signal connection ports of a corresponding detection instrument. By applying the pressure sensor for measuring, accurate dual-wavelength laser and microwave signals generated by a resonator laser can be respectively measured conveniently.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to the structural technology of a pressure sensor based on an optical fiber grating. Background technique [0002] Optical fiber sensing technology is a new type of sensing technology that uses light as the carrier and optical fiber as the medium to perceive and transmit external signals (to be measured) developed rapidly along with the development of optical fiber communication technology. When the external signal is pressure, it constitutes an optical fiber pressure sensor. Compared with traditional electromechanical sensors, fiber optic sensors have the advantages of intrinsic explosion-proof, anti-electromagnetic interference, stable performance, corrosion resistance, light weight, etc., and are suitable for use in harsh environments. [0003] As a new type of fiber optic passive device, fiber Bragg grating (FBG) has broad application prospects in the ...

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Problems solved by technology

[0005] However, the bandwidth of FBG is usually too wide compared with the spectral interval of reflection peaks induced by micro-stress, which brings certain obstacles to high-resolution measurement of pressure sensing.

Currently proposed schemes for high-resolution sensing are mainly based on π-phase-shift gratings, long-period gratings, and reversible sampling gratings. However, the processing of π-phase-shifting gratings and reversible sampling gratings is more complicated than ordinary gratings. It brings inconvenience to the large-scale application of this sensor, the long-period grating is sensitive to temperature, and there is a serious crosstalk problem

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