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Clamped fiber Bragg grating strain and crack sensing device

A technology of optical fiber Bragg and grating strain, applied in the direction of measuring devices, instruments, etc., can solve the problems of large strain transmission loss, multi-peak signal, inconvenient welding and installation, etc., and achieve reduced strain transmission loss, high survival rate, and convenient use Effect

Pending Publication Date: 2018-10-30
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The purpose of the invention is to provide a clamping optical fiber Bragg grating strain and crack sensing device to solve the problems of large strain transmission loss, prone to signal multi-peak phenomenon, and inconvenient welding and installation

Method used

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  • Clamped fiber Bragg grating strain and crack sensing device
  • Clamped fiber Bragg grating strain and crack sensing device
  • Clamped fiber Bragg grating strain and crack sensing device

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Such as Figure 1-2 As shown, the clamping fiber Bragg grating strain and crack sensing device includes a fiber Bragg grating 1, which is arranged inside a capillary steel pipe 2, and both ends of the capillary steel pipe 2 and fiber Bragg grating 1 are connected with a clamping part 4, and the fiber Bragg grating The grating 1 passes through the capillary steel pipe 2, and the center of the grating is located in the middle of the axial direction of the capillary steel pipe 2. The fiber Bragg grating 1 includes several fiber Bragg gratings connected end to end with different grating constants to form a quasi-distributed fiber Bragg grating. The clamping part 4 consists of It consists of two split parts connected by bolts, and the fiber Bragg grating is connected to the fiber Bragg grating demodulator 6 through a single-mode fiber 5 . The fiber Bragg grating and...

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Abstract

The invention discloses a clamped fiber Bragg grating strain and crack sensing device. The device comprises fiber Bragg gratings which are arranged in a capillary steel pipe, clamping components are connected to both ends of the capillary steel pipe, and the fiber Bragg gratings are connected to a fiber grating demodulator through a single-mode optical fiber. Requirements for the quality of an adhesive are low, the strain transmission loss in a sensing process is effectively reduced, and meanwhile, the survival rate is high. The defects of clamped encapsulation are overcome, and a multi-peak phenomenon of signals is eliminated; at the same time, the scale distance can be adjusted, welding and rivet joint can be conducted, the device is convenient to use, and distributed sensing can be achieved.

Description

technical field [0001] The invention relates to an optoelectronic testing and structural health monitoring device, in particular to a clamping optical fiber Bragg grating strain and crack sensing device. Background technique [0002] Concrete is favored by engineering circles because of its durability, high compressive strength and good plasticity, and has been widely used in various large-scale projects. However, its tensile strength is low and it is easy to crack, especially in large-volume concrete such as dams and bridges, the existence of cracks is very common. Cracks will reduce the strength of the structure, reduce the service life of the project, and even endanger the normal operation of the project. Strengthening structural damage detection and monitoring, and paying attention to damage identification and diagnosis are of great significance to the timely discovery of safety hazards and the scientific prevention of mutation accidents. For large-volume concrete proj...

Claims

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Application Information

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IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 苏怀智贾强强周枫枫杨孟
Owner HOHAI UNIV