Optical fiber grating liquid level sensor and its preparation method

A liquid level sensor and fiber grating technology, applied in the field of sensing, can solve the problems of small dynamic range, poor linearity, cross-sensitivity, etc., achieve the effect of large dynamic range, improve dynamic range, and eliminate the influence of measurement accuracy

Active Publication Date: 2016-06-22
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0010] The purpose of the present invention is to provide a fiber grating liquid level sensor and its preparation method in order to further solve the technical problems of small dynamic range, poor linearity, low precision and cross-sensitivity of the existing fiber grating liquid level sensor

Method used

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  • Optical fiber grating liquid level sensor and its preparation method

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0028] The preparation method step of a kind of fiber grating liquid level sensor of the present invention is:

[0029] 1), such as figure 1 As shown, the optical fiber 1 engraved with the fiber grating 3 and the sensing fiber grating 4 is inserted into the first capillary metal tube 2 and the second capillary metal tube 5, the fiber grating 3 is in the first capillary metal tube 2, and the sensing The fiber grating 4 is located between the first capillary metal tube 2 and the second capillary metal tube 5, encapsulated, and the designated end 6 of the first capillary metal tube 2, and the designated end 7 of the second capillary metal tube 5 are glued to the optical fiber 1 fixed, formed as figure 1 structural units shown;

[0030] 2), then aging the packaged structural unit; the specific process of aging: put the packaged structural unit into the high and low tem...

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Abstract

The invention discloses an FBG (Fiber Bragg Grating) liquid level sensor and a preparation method thereof. The sensor comprises a metal base, pressure sensing membranes, two metal capillary tubes, optical fibers carved with two FBGs having different wavelengths, pins and a tail fiber sleeve, wherein the optical fibers penetrate into the two metal capillary tubes; an FBG is located in the first metal capillary tube; a sensing FBG is located between the two metal capillary tubes to form a structural unit; the pressure sensing membranes are fixed on the metal base, and an air cavity is formed between the pressure sensing membranes; the structural unit is located in the air cavity; the first metal capillary tube is located at the center of each pressure sensing membrane; the optical fibers are vertical to the plane where the pressure sensing membranes locate; the second tube capillary tube stretches out of the metal base and is positioned by the pins; and the tail fiber sleeve is fixed at the lower end of the metal base to be communicated with atmosphere. The metal capillary tubes are titanium tubes; and the metal base is made of stainless steel. The sensor can be applied to inflammable, explosive and strongly-corrosive liquid, and has the advantages of wide dynamic range, an FS with the precision of 0.5%, a linearity of 99.7%, electromagnetic interference resistance, easy reusability and the like.

Description

technical field [0001] The invention relates to an optical fiber grating liquid level sensor and a preparation method thereof, belonging to the field of sensor technology. Background technique [0002] Liquid level measurement is widely used in various fields of engineering production. The liquid level sensor is a device used to detect liquid height information, and it plays an important role in engineering production. There are many types of current liquid level sensors: [0003] 1 Mechanical float level gauge: The mechanical float level gauge uses a transmission device to convert the information at the same height as the liquid level into a pulse signal or a continuous signal. The converter is some mechanical reed, magnet, electronic or optoelectronic equipment. [0004] 2 Electronic liquid level sensor: The measurement principle of electronic liquid level sensor is to convert the change of liquid level into the change of electrical parameters, and use the measurement ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/14
Inventor 童杏林冷卓燕胡巍石锐陈磊
Owner WUHAN UNIV OF TECH
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