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A kind of optical fiber fp pressure sensor based on hydraulic principle

A pressure sensor, a technology based on hydraulic principles, applied in hydraulic/pneumatic measurement, fluid pressure measurement using optical methods, and fluid pressure measurement, etc., can solve problems such as inability to achieve pressure measurement, uncontrollable shape and size of FP cavity, etc. Achieve high sensitivity, avoid interference and improve accuracy

Active Publication Date: 2022-02-15
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this manufacturing method provides a new idea, the shape and size of the manufactured FP cavity are uncontrollable, and accurate pressure measurement cannot be achieved.

Method used

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  • A kind of optical fiber fp pressure sensor based on hydraulic principle
  • A kind of optical fiber fp pressure sensor based on hydraulic principle

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0021] The present invention provides a kind of optical fiber FP pressure sensor based on hydraulic principle, such as figure 1 As shown, it has the advantages of high sensitivity, fast response, wide application range and simple structure. The structure, principle, operation, etc. will be further described in detail below.

[0022] An optical fiber FP pressure sensor based on a hydraulic principle, comprising a glass shell 1 with an open upper end, the thermal expansion coefficient of the glass is relatively small, which can reduce the influence of temperature. The thickness of the glass shell 1 is 150 μm, the diameter of the top of the glass shell 1 is 1 cm, and the diameter of the bottom is 4 mm.

[0023] A central hole is provided at the bottom of the glass case 1, and t...

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Abstract

The invention discloses an optical fiber FP pressure sensor based on the principle of hydraulic pressure, which comprises a glass shell with an open upper end, a central hole is opened at the bottom of the glass shell, a bowl-shaped metal diaphragm is buckled above the central hole, and the lower end of the central hole is A single-mode optical fiber is inserted, and a sealed FP cavity is formed between the metal diaphragm and the top end face of the single-mode optical fiber. The side of the metal diaphragm facing the FP cavity is coated with a reflective film; the inside of the glass shell is filled with liquid, and the top is sealed Cover with a film. The pressure sensor disclosed by the invention has the advantages of simple structure, high sensitivity, insensitivity to temperature and long service life.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to an optical fiber FP pressure sensor based on a hydraulic principle. Background technique [0002] With the rapid development of optical fiber communication technology, fiber optic sensors have achieved fruitful results in the past forty years, and a large number of sensors based on fiber gratings, Michelson interferometers, micro-nano fibers, and Fabry-Perot (F-P) interference have emerged. The optical fiber sensor of optical fiber sensor and other technologies, the optical fiber Fabry-Perot interferometer has attracted the attention of scholars at home and abroad because of its simple structure, small size, strong anti-interference ability, high precision, and low cost. At present, there have been optical fiber FP Interferometer pressure sensor, refractive index sensor, temperature sensor, etc. The principle of the fiber optic FP pressure sensor is that external pressure is applied to the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/02G01L1/24G01L11/02G01L19/00
CPCG01L1/02G01L1/242G01L11/025G01L19/00
Inventor 冯德军朱佳成王淑贤
Owner SHANDONG UNIV