Fiber grating force-measuring anchor rod device

A fiber grating and anchor technology, which is applied in the direction of measuring the change of optical properties of materials when they are stressed, can solve the problems of poor reliability, short transmission distance, and low measurement accuracy, and achieve increased reliability and resistance. Strong electromagnetic interference, good anti-lightning performance

Inactive Publication Date: 2013-07-17
SHANGHAI KNP CHEM +3
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional force-measuring bolt device is to slot on both sides of the bolt device, paste the resistance strain gauge, and analyze the force condition of the bolt device by observing the resistance value change of the strain gauge. The bolt device needs to work live, beca

Method used

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  • Fiber grating force-measuring anchor rod device

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] In this example, if figure 1 As shown, the main body of the anchor device includes an optical fiber 12, a rod beam 5, and a hollow anchor rod 8. Four gratings 11 are arranged on the optical fiber 12, and the distance between every two gratings 11 is 500 mm. Each grating 11 is pasted on the rod beam. 5, one end of the rod beam 5 is threaded, and the other end is a limiting block 51, the outer diameter of the limiting block 51 is greater than the inner diameter of the hollow anchor rod 8, and the rod beam 5 pasted with the grating 11 passes through the hollow anchor rod 8, The stopper 51 is stuck on one end of the hollow anchor rod 8, and a fastening nut 9 and an end nut 10 are arranged at the other end of the hollow anchor rod 8, and both the fastening nut 9 and the end nut 10 are threadedly connected with the beam 5 , under the combined action o...

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Abstract

The invention relates to a fiber grating force-measuring anchor rod device. The fiber grating force-measuring anchor rod device comprises an optical fiber, a rod beam and a hollow anchor rod, wherein at least one grating is arranged on the optical fiber, gratings are adhered onto the rod beam, the rod beam penetrates through the hollow anchor rod, a limiting block is arranged at one end of the rod beam and is clamped on one side of the hollow anchor rod, a fastening nut and an end nut are in threaded connection with the rod beam, the hollow anchor rod is connected with an optical fiber base through welding, the optical fiber base is in threaded connection with an optical fiber base cover, the optical fiber base cover is provided with an optical fiber connection flange and is in threaded connection with a protective cover, and an optical fiber outlet is arranged on the protective cover. According to the fiber grating force-measuring anchor rod device, deformation data of the anchor rod device are collected through fiber gratings, and the optical fiber has the advantages of being good in lightning stroke resistance, high in anti-electromagnetic interference capability and capable of achieving remote measurement, so that the reliability and the measurement precision of the fiber grating force-measuring anchor rod device are improved, and the data transmission distance of the fiber grating force-measuring anchor rod device is increased.

Description

technical field [0001] The invention relates to an optical fiber force measuring sensor, in particular to an optical fiber grating force measuring bolt device. Background technique [0002] In engineering construction and roadway support, the long-term monitoring of bolt devices has always been the focus of domestic and foreign geotechnical engineering and mine road support construction circles. The traditional force-measuring bolt device is to slot on both sides of the bolt device, paste the resistance strain gauge, and analyze the force condition of the bolt device by observing the resistance value change of the strain gauge. The bolt device needs to work live, because The electrical sensor itself has poor anti-lightning performance, low anti-electromagnetic interference performance, and incapable of long-distance transmission, which make it have defects such as poor reliability, low measurement accuracy, and short transmission distance. Contents of the invention [000...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 孟申庆张恒张杰郑炜何唯平
Owner SHANGHAI KNP CHEM
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