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Slrain and temperature change simultaneously-measured single fibre grating packaging method and its sensor

A packaging method and fiber grating technology, applied in the field of optical fiber sensing and sensing

Inactive Publication Date: 2003-04-23
NANKAI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current schemes all have a single measurement structure, that is, only a single parameter can be measured with one fiber grating - temperature change, strain or stress
The search results show that there is currently no single FBG sensor encapsulated in the above two different chemical polymers that can simultaneously measure strain and temperature change

Method used

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  • Slrain and temperature change simultaneously-measured single fibre grating packaging method and its sensor
  • Slrain and temperature change simultaneously-measured single fibre grating packaging method and its sensor
  • Slrain and temperature change simultaneously-measured single fibre grating packaging method and its sensor

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Embodiment Construction

[0011] Mark two sections of Fiber Bragg Grating 1 with a marking line, and first package one section of it into a 3×3×20mm cylinder with a mold, so that the Fiber Bragg Grating 1 is located in the center of the cylinder, and package it into a polyurethane armor 3; then, After the polyurethane A 3 is cured, the entire fiber grating is packaged in a 4×4×40 mm polyamide 4, and the fiber grating must also be located at the center of the polyamide 4.

[0012] In the specific implementation example figure 2 Among them, the sensor includes fiber Bragg grating 1, cladding optical fiber 2, chemical polymer A 3, chemical polymer B 4, broadband light source 5, wavelength tester 6, 2×2 fiber coupler 7, matching liquid 8, pressure Tank 9, pressure gauge 10. Connection method: Two optical fibers on one side of the 2×2 fiber optic coupler 7, one is inserted into the matching liquid 8, the other is connected to the packaged fiber Bragg grating 1, and put it into the pressure tank 9, the pre...

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Abstract

The present invention relates to an encapsulation method of single-fibre grating capable of simultaneously measuring strain and temp. change and its sensor. One fiber-optical grating is divided into two parts, they can be encapsulated by using two different chemical polymers respectively, and its sensor can be assembled by using fiber-optical grating, wide-band light source, wavelengther tester, 2X2 fiber coupling device, matching liquor, pressure tank and pressure gauge. When the encapsulated fiber-optical grating is acted extemally, in the reflection spectrum of said fiber-optic grating tworeflection peaks are produced, only the wavelength difference between two reflection peaks is measured, so that it can implement simultaneous measurement of strain and temp. change.

Description

technical field [0001] The invention is an inventive design in the field of optical fiber sensing, in particular a single optical fiber grating sensor for simultaneous measurement of strain and temperature, which belongs to the field of sensing technology. technical background [0002] Fiber Bragg Grating is a new type of photonic device whose output light wavelength is the information. The technology of using fiber gratings for sensing, that is, fiber grating sensors are used for stress, strain, temperature, and temperature change measurement. It has many excellent characteristics such as convenience, sensitivity, high precision, acid and alkali resistance, and anti-electromagnetic interference. It has been widely used In various fields such as industry, construction, national defense and scientific research. However, the current schemes all have a single measurement structure, that is, a single fiber grating can only be used to measure a single parameter - temperature cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26G01D21/02
Inventor 开桂云张伟刚董孝义袁树忠赵启大刘志国
Owner NANKAI UNIV
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