Double fiber bragg grating sensor for rock bolt anchoring quality test

A dual-fiber grating and sensor technology, applied to instruments, measuring devices, scientific instruments, etc., can solve problems such as complex structures

Inactive Publication Date: 2014-09-24
SHANDONG UNIV
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Problems solved by technology

There are some research reports on sensors made of fiber grating devices. For example, Jiang Desheng and Nan Qiuming of Wuhan University of Technology used pasted fiber grating sensors to distribute and long-term detect the stress of prestressed anchor rods; developed by Chai Jing and Li Yi of Xi'an University of Science and Technology A

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  • Double fiber bragg grating sensor for rock bolt anchoring quality test
  • Double fiber bragg grating sensor for rock bolt anchoring quality test

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Embodiment Construction

[0021] The present invention is described in detail below in conjunction with accompanying drawing:

[0022] The double fiber grating sensor used for bolt anchorage quality detection includes a clip 2 that can clamp the circular shell of the end of the bolt 3 in the rock 1, and the inner wall of the clip 2 is pasted on one side along the axial direction of the bolt An elastic block I5, and a hollow elastic block II7 of the same size as the elastic block I5 is pasted on the other side, the sensor grating 6 is placed in the groove of the elastic block I5, and the matching grating 8 is placed in the hollow part of the elastic block II7 in a free state , the parameters of the two fiber Bragg gratings are the same, and they are processed by ultraviolet engraving at a certain distance apart on an optical fiber. The output end of the optical fiber is connected to the output end of the coupler, one input end of the coupler is connected to the light source, and the other reflection inp...

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Abstract

The invention discloses a double fiber bragg grating sensor for rock bolt anchoring quality test. The sensor comprises a clip for clamping an annular housing at the tip of the rock bolt; on one end of the inner wall of the clip is provided with an elastic block I along the axial direction of rock bolt, and the other end is provided with an elastic block II; a sensing optical grating is placed in the elastic block I; and a matching optical grating in a free state is placed in the elastic block II, and the sensing optical grating and matching optical grating have the same Bragg grating parameters. Two optical gratings at a preset interval are in a same fiber, the optical fiber passes through the clip and is connected with the data processing device. After excitation of elastic wave by the tip of the rock bolt, the elastic wave propagating along the rock bolt or reflected elastic wave acts on the sensing optical grating to cause the migration of reflection spectrum central wavelength of the sensing optical grating, and the overlapping region with the reflection spectrum of the matching grating is subjected to light intensity demodulation and data processing, so as to obtain time domain or frequency domain characteristics of the elastic wave signals.

Description

technical field [0001] The invention discloses a dual optical fiber grating sensor used for anchorage quality detection of anchor bolts. Background technique [0002] Anchor rods are widely used in highways, railways, mines, civil construction and other projects, mainly for slope reinforcement and underground support. In the bolt anchoring technology, the length of the anchor bolt embedded in the rock and the mortar saturation between the anchor bolt and the rock are the key to evaluating whether the bolt can exert its maximum effect. The main task of quality inspection. The traditional anchoring quality inspection methods are pull-out test method and coring method. Although this method is intuitive, it is a destructive inspection method and has great limitations. Several types of sensors, such as resistance strain gauge, differential resistance strain gauge, steel string and hydraulic pillow, have been developed subsequently. These electromechanical sensitive components h...

Claims

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Application Information

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IPC IPC(8): G01N29/24G01H9/00
Inventor 蒋奇王艳闫涛宋金雪周信
Owner SHANDONG UNIV
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