An optical fiber macrobending pressure sensor and its measurement system

Abstract

The invention discloses an optical fiber macrobending pressure sensor and a measuring system thereof. The sensor includes a housing, an elastic diaphragm, a bracket, a sleeve, a dowel rod, an optical fiber, an incident optical fiber through hole, and an outgoing optical fiber through hole. The bottom of the housing is fixed with an elastic diaphragm, and the bracket is fixed inside to fix the sleeve, and the top is provided with a through hole for incident optical fiber; the dowel rod passes through the sleeve, one end is fixed on the center of the elastic diaphragm, and the other end is fixedly connected to the outgoing optical fiber The optical fiber passes through the incident optical fiber through hole and the outgoing optical fiber through hole to form a macrobend section of the optical fiber; the sensor and its measurement system use a combined structure of an elastic diaphragm and an optical fiber macrobend, as well as a photodiode that converts optical signals into electrical signals. Realize the measurement of pressure. The optical fiber macrobending pressure sensor provided by the invention has the advantages of simple structure, easy processing, low price, intrinsic safety and corrosion resistance, and has broad application prospects in the fields of petrochemical, civil engineering and water conservancy, aerospace and the like.

Description

technical field [0001] The invention relates to the technical field of pressure sensors and optical fiber sensing, in particular to an optical fiber macrobending pressure sensor and a measurement system thereof. Background technique [0002] Optical fiber sensor is a sensing technology developed rapidly along with the development of optical fiber communication technology. It has the advantages of small size, light weight, high sensitivity, intrinsic safety, anti-electromagnetic interference, corrosion resistance, and long life. Through appropriate modulation and demodulation methods, fiber optic sensors can realize the measurement and long-term online monitoring of multiple physical quantities and parameters such as temperature, pressure, strain, acceleration, displacement, flow, electric field, magnetic field, etc., and thus have been widely researched and applied. [0003] In harsh environments such as high temperature, high pressure, corrosion, flammability, explosion, an...

AI Technical Summary

Problems solved by technology

At present, there are fiber grating pressure sensors, lever-type fiber grating pressure sensors, and all-fiber high-sensitivity pressure sensors, but fiber grating pressure sensors have temperature-pressure cross-sensitivity, and the measurement results are easily affected by temperature. The structure is complex, and the optical fiber Fabry-Perot interference pressure sensor also needs to be temperature compensated, and the cavity sealing process is strict, and the yield is low

All in all, these two types of optical fiber pressure sensors are complex in structure, high in cost, and expensive in modulation and demodulation equipment, making it difficult to achieve popularization and application

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