FBG pressure sensor based on diaphragm and flexible hinge lever mechanism

A pressure sensor and flexible hinge technology, which is applied in the application of optical methods for fluid pressure measurement, fluid pressure measurement, and force measurement by measuring the change of optical properties of materials when they are stressed. It can solve the problem of grating chirp and no temperature compensation. , the limited pressure bearing capacity of the film sheet, etc., to achieve the effect of temperature self-compensation, pressure sensitization, and improvement of measurement accuracy and sensitivity

Active Publication Date: 2021-08-20
中山市精量光电子科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, as the polymer material will change with the temperature, the Young's modulus will change greatly, which will affect the measurement accuracy; and it will be easily damaged in corrosive environments such as oil and seawater, which makes it not suitable for large temperature changes. Pressure measurement in large and harsh corrosive environments
In the traditional FBG pressure sensitization method based on elastic materials, the fiber grating is directly pasted on the center of the thin sheet, and the grating is strained by the deformation of the diaphragm to achieve the sensitization effect. Chirp, no temperature compensation either
[0004] In addition, in the article "High Sensitivity Fiber Bragg Grating Pressure Sensor Based on Elastic Sheet Packaging" published in "Optoelectronics·Laser" Volume 22 Issue 5 in May 2011, the deformation caused by the pressure response is directly transmitted through a flat circular sheet. Converted to the axial strain of FBG, due to the stretching of FBG and its own elastic-optic effect, it is converted into the change of the reflected wavelength of the FBG center, thereby achieving high-sensitivity signal detection, but the pressure-bearing capacity of the film is limited, which will lead to Its pressure measurement range is not high; and there is no temperature self-compensation, temperature changes will affect the measurement accuracy
In the article "A High-Sensitivity Fiber Bragg Grating Pressure Sensor" published in "Optoelectronics·Laser" Volume 23, Issue 11 in November 2012, by pasting FBG on the L-shaped beam, when the pressure acts on one end, it is a frustum structure When the piston is on the piston, the piston will push the L-beam to bend through the cone, so that the FBG will be strained. Although the sensor achieves pressure sensitivity, its sensitivity effect is still insufficient.
In the article "High Sensitivity Fiber Bragg Grating Pressure Sensor Based on Sinusoidal Mechanism Force Amplification Principle" published in "Journal of Instrument and Apparatus" Volume 27 Issue 7 in July 2006, its flat circular thin plate structure can make the sensitivity reach a higher value , but the bending structure of the optical fiber is easy to bend the optical fiber, which seriously affects the service life of the optical fiber

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  • FBG pressure sensor based on diaphragm and flexible hinge lever mechanism
  • FBG pressure sensor based on diaphragm and flexible hinge lever mechanism
  • FBG pressure sensor based on diaphragm and flexible hinge lever mechanism

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[0023] This part will describe the specific embodiment of the present invention in detail, and the preferred embodiment of the present invention is shown in the accompanying drawings. Each technical feature and overall technical solution of the invention, but it should not be understood as a limitation on the protection scope of the present invention.

[0024] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0025] I...

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Abstract

The invention discloses an FBG pressure sensor based on a diaphragm and a flexible hinge lever mechanism. The sensor comprises a shell assembly, a diaphragm, a dowel bar, a lever mechanism, a pressure measuring fiber bragg grating and a temperature measuring fiber bragg grating, wherein the shell assemblyis provided with two optical fiber outlets at the top and a pressure measuring channel at the bottom; the diaphragm is arranged in the pressure measuring channel; the dowel bar is positioned above the diaphragm and is connected with the middle part of the diaphragm; the lever mechanism is arranged in the inner cavity of the shell assembly and comprises a supporting frame and a flexible hinge lever arranged on the supporting frame, and the flexible hinge lever is located above the dowel bar; the pressure measuring fiber bragg grating and the temperature measuring fiber bragg grating are arranged on the flexible hinge lever and are arranged at intervals, and tail fibers of the pressure measuring fiber bragg grating and the temperature measuring fiber bragg grating penetrate through the fiber outlets respectively. Through the above structure, pressure sensitization can be realized, temperature self-compensation can be carried out, and the measurement precision and sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing and monitoring, in particular to a fiber grating pressure sensor. Background technique [0002] In recent years, fiber grating sensors have been widely used due to their advantages such as explosion-proof, light weight, small size, corrosion resistance, anti-electromagnetic interference, high reliability, and easy networking. However, since the pressure sensitivity of the bare fiber grating is very low, only about 3pm / Mpa, the too low sensitivity cannot meet the high-sensitivity measurement in practical applications. Therefore, some sensors adopt pressure sensitization technology. Traditional pressure sensitization includes FBG pressure sensitization based on polymer-filled metal tubes and FBG pressure sensitization based on elastic materials (FBG, Fiber Bragg Grating, Fiber Bragg Grating). [0003] In the traditional FBG pressure-sensitizing method based on polymer-filled metal tub...

Claims

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Application Information

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IPC IPC(8): G01L1/24G01L11/02G01L19/04G01K11/3206
CPCG01L1/246G01L11/025G01L19/04G01K11/3206
Inventor 梁磊叶天翊刘小斌江轲童晓玲涂彬曾菲虹钟亮
Owner 中山市精量光电子科技有限公司
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