A Novel Fiber Bragg Grating Density Sensor Based on Differential Pressure Method

Abstract

The invention relates to a novel FBG (Fiber Bragg Grating) density sensor based on a differential pressure method. The novel FBG-based density sensor mainly comprises a protective housing, wherein the protective housing is in a cylindrical shape; a first cross beam is arranged in a position close to the top part along a diameter direction, a second cross beam is arranged in a position close to the bottom part along the diameter direction, and the first cross beam and the second cross beam are identical in length and diameter and are parallel to each other; a first convoluted diaphragm is fixedly arranged at the top part of the protective housing along the horizontal plane, and a second convoluted diaphragm is fixedly arranged at the bottom part of the protective housing along the horizontal plane; the two convoluted diaphragms are parallel to each other; a first metal sensitization structure is fixedly arranged on the first cross beam and is in contact with the first convolved diaphragm, and a second metal sensitization structure is fixedly arranged on the second cross beam and is in contact with the second convoluted diaphragm; the metal sensitization structures and the cross beams form isosceles triangles, and points in contact with the convoluted diaphragms are isosceles vertexes; a first FBG is fixedly arranged between two waists of the first metal sensitization structure in a penetrating way; a second FBG is fixedly arranged between two waists of the second metal sensitization structure in the penetrating way.

Description

technical field [0001] The invention relates to a novel optical fiber grating density sensor based on differential pressure method. Background technique [0002] Fiber Bragg grating sensing has the advantages of small size, light weight, anti-electromagnetic interference, good reusability and other types of sensors. It has developed rapidly in recent years, and various fiber grating sensing products have been developed and widely used. Fiber Bragg grating strain sensors are widely used and play an important role in various engineering fields such as aerospace, large-scale electromechanical equipment, and bridge construction. In recent years, FBG sensors have been well developed in other measured aspects, such as temperature, strain, displacement, pressure, flow, etc., but there are few research and application reports on FBG sensors in the field of density measurement, and FBG sensors In the research of density sensor, due to the low sensitivity of the bare fiber grating se...

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Problems solved by technology

In recent years, FBG sensors have been well developed in other measured aspects, such as temperature, strain, displacement, pressure, flow, etc., but there are few research and application reports on FBG sensors in the field of density measurement, and FBG sensors As a density sensor, due to the low sensitivity of the bare fiber grating sensor, it cannot meet the requirements of engineering measurement accuracy.

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