Maximum principal stress sensor of road fiber grating

A maximum principal stress, fiber grating technology, applied in instruments, measurement force, measurement of force by measuring the change of optical properties of materials when they are stressed, etc., can solve problems such as single stress and strain measurement, and achieve a wide range of applications, It is convenient for on-site construction and has good insulation performance.

Active Publication Date: 2017-02-08
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0003] Existing fiber grating strain sensors often can only measure stress and strain in a single direction, and as the sensor is embedded in the structure, its test direction is also fixed
However, due to the randomness of the vehicle load position, the stress field at the position of the sensor will change at any time, and it is difficult for traditional sensors to reflect this change in real time

Method used

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  • Maximum principal stress sensor of road fiber grating
  • Maximum principal stress sensor of road fiber grating

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Depend on figure 1 or figure 2 A fiber grating maximum principal stress sensor for road is shown, which includes a compensating fiber grating 1, a hydraulic chamber 4, a stressed fiber grating 5, an elastic diaphragm 7, a spherical shell 8, an optical fiber fixing ring 9, an optical fiber fixing nail 10, a fixing Ring 11, the two ends of the stressed fiber grating are fixed on the two elastic diaphragms by the fiber fixing ring and the fiber fixing nail, and the external packaging structure of the stressed fiber grating can be added according to actual needs, for example, for some If the structure needs to reduce the test sensitivity, it can be achieved by increasing the package diameter of the middle fiber grating, or increasing the package modulus; similarly, for some structures at low stress levels, when the test sensitivity needs to be increased, it can be...

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Abstract

The present invention relates to a maximum principal stress sensor of road fiber grating. The test of the maximum principal stress in the pavement structure can be realized. The sensor comprises spherical housing; a liquid chamber arranged in the spherical housing and consisting of a cavity body and internal fillers; elastic membranes which are fixed at two sides of the liquid chamber through fixed rings and have a force fiber grating arranged at the middle; and a compensation fiber grating arranged at the other side of the elastic membranes and configured to compensate the measurement error caused by the surrounding environment temperature of the sensor. Compared to a traditional sensor, the stress sensor provided by the invention can measure the pavement structure maximum principal stress, has the measurement result which cannot be influenced by the stress direction, is provided with temperature compensation, is easy in laying networking and wide in application range and can realize the remote distance monitoring, etc.

Description

technical field [0001] The invention relates to the field of optical fiber grating stress sensing, in particular to a road-use optical fiber grating maximum principal stress sensor. Background technique [0002] It is extremely important to grasp the real internal mechanical response of the pavement structure. With the development of optical fiber sensing technology, the fiber grating sensor has the advantages of anti-electromagnetic interference, corrosion resistance, high insulation, wide measurement range, and easy reuse into a network. , It has been widely used in civil engineering, aerospace, petrochemical, electric power, medical, shipbuilding and other fields. When the external force on the fiber Bragg grating changes, the stress distribution of the fiber Bragg grating itself changes accordingly, which causes the change of the center wavelength of the fiber Bragg grating; through the fiber Bragg grating demodulation equipment, the change of the center wavelength can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/246
Inventor 董泽蛟张同心马宪永邵显智陈凤晨
Owner HARBIN INST OF TECH
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