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Bidirectional fiber bragg grating double-variable sensor based on optical fiber sensing

A two-way optical fiber and optical fiber sensing technology, applied in the direction of instruments, measuring devices, measuring device casings, etc., can solve the problems of less research on temperature and strain bivariate sensors, low sensitivity of strain monitoring, and susceptibility to strong electromagnetic interference, etc., to achieve Ensure full contact and coordinated deformation, compact structure of the device, and strong practical effect

Inactive Publication Date: 2021-09-24
SHANGHAI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Due to the shortcomings of traditional strain monitoring such as low sensitivity and susceptibility to strong electromagnetic interference, the measurement error is relatively large, and fiber grating sensing technology has been gradually applied to the field of civil engineering because of its high measurement accuracy and real-time monitoring advantages.
[0003] At present, there are many studies on the internal strain sensor of concrete, and less research on the temperature and strain bivariate sensor

Method used

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  • Bidirectional fiber bragg grating double-variable sensor based on optical fiber sensing

Examples

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Effect test

Embodiment 1

[0022] In this example, see figure 1 , a bidirectional fiber grating bivariate sensor based on optical fiber sensing, consisting of optical fiber 1, PVC optical fiber protection sleeve 2, optical cable 3, fiber grating demodulator 4, external packaging protection structure 5, temperature grating area 6, two strain Composed of grating areas 7, 7', optical fiber fusion splicing area 8, and device inner cavity 9; it is characterized in that one strain grating area 7 and temperature grating area 6 are packaged in a tube, while the other strain grating area 7' is embedded in a package In the inner cavity 9 of the device, the strain and temperature in two directions can be measured.

[0023] This embodiment is based on a bidirectional fiber grating bivariate sensor of optical fiber sensing, which can measure temperature and strain in two directions, and perform temperature compensation while measuring strain to obtain more accurate strain data; measure temperature and strain in two ...

Embodiment 2

[0025] This embodiment is basically the same as Embodiment 1, especially in that:

[0026] In this example, see figure 1 , the optical fiber 1 is an optical signal transmission area, and its tubular packaging section is connected with the strain grating area 7 and the temperature grating area 6 .

[0027] The strain grating area 7 and the temperature grating area 6 are connected by an optical fiber fusion splicing area 8 .

[0028] In this embodiment, the PVC optical fiber protection sleeve 2 has a diameter of 2mm.

[0029] The lengths of the strain grating region 7 and the temperature grating region 6 are not greater than 10mm.

[0030] The length of the optical fiber fusion zone 8 is not more than 60mm.

[0031] The optical fiber 1 is connected to the optical cable 3, and the change of the central wavelength of the grating area is obtained after the optical signal is analyzed by the fiber grating demodulator 4. The entire optical fiber 1 is protected by the PVC sleeve 2 e...

Embodiment 3

[0034] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0035] In this embodiment, the preparation method of the external packaging protection structure: the external protection structure is modeled by a 3D printing method, and then imported into a slicing software and printed to complete the external packaging protection structure. The invention directly embeds the bare fiber into the 3D printing packaging device, which ensures the complete contact and coordinated deformation of the grating measurement area and the device, and ensures the accuracy of measurement.

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Abstract

The invention discloses a bidirectional fiber bragg grating double-variable sensor based on optical fiber sensing, which is applied to a strain and temperature double-parameter measurement device in a concrete structure, and belongs to the technical field of optical fiber sensing. The device is composed of an optical fiber, a PVC optical fiber protection sleeve, an optical cable, an optical fiber grating demodulator, an external packaging protection structure, a temperature grating area, a strain grating area, an optical fiber welding area and a device inner cavity. The fiber grating sensing technology is gradually applied to the field of civil engineering due to the advantages of high measurement precision and real-time monitoring. The outermost protection structure is subjected to modeling design through a 3D printing method and then imported into slicing software to be printed, and the external packaging structure is completed. A mode of combining tubular packaging and embedded packaging is adopted, and one temperature sensor and two strain sensors are packaged in one device. Temperature compensation is carried out while strain is measured, so that more accurate strain data is obtained; and the strain in the X direction and the strain in the Y direction are measured, and meanwhile the temperature measuring function is achieved.

Description

technical field [0001] The invention relates to a device for dual-parameter measurement of strain and temperature of concrete structures, which belongs to the technical field of optical fiber sensing. Background technique [0002] In engineering practice, traditional strain monitoring has always played an important role. Due to the shortcomings of traditional strain monitoring such as low sensitivity and susceptibility to strong electromagnetic interference, the measurement error is relatively large, and fiber grating sensing technology has been gradually applied to the field of civil engineering because of its high measurement accuracy and real-time monitoring advantages. [0003] At present, there are many studies on the internal strain sensor of concrete, but less research on the temperature and strain bivariate sensor. Invention patent bidirectional long-gauge fiber grating strain sensor, mainly provides a fiber grating sensor that can measure stress and strain in two v...

Claims

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Application Information

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IPC IPC(8): G01D21/02G01D11/24
CPCG01D21/02G01D11/24
Inventor 张孟喜
Owner SHANGHAI UNIV
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