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All-fiber laser detection system for tunnel safety monitoring and working method

A technology of safety monitoring and laser detection, which is applied in the direction of measuring devices, optical devices, color/spectral characteristics measurement, etc., can solve the problems of low work efficiency, low detection accuracy, poor real-time performance, etc., and achieve simple structure, high measurement accuracy, The effect of high sensitivity

Active Publication Date: 2021-03-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current deformation and gas monitoring methods use laser rangefinders or portable gas monitors for monitoring. The current detection methods are to use manual shifts to monitor the safety of the tunnel. This detection tool and method has low work efficiency and low detection accuracy. Disadvantages of poor real-time performance

Method used

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  • All-fiber laser detection system for tunnel safety monitoring and working method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An all-fiber laser detection system for tunnel safety monitoring, including a laser, an optical fiber splitter 1 is arranged on the output optical path of the laser, and the two outputs of the optical fiber splitter 1 are respectively sent to the optical fiber splitter 2 and the fiber modulator, and the fiber modulation The output of the splitter is connected to the fiber splitter 3.

[0035] The two outputs of the fiber splitter 3 are respectively connected to the fiber combiner 1 and the fiber combiner 2 .

[0036] One output of the fiber splitter 2 is connected to the fiber combiner 1 through the fiber circulator, and the other output of the fiber splitter 2 is reflected by the mirror, then connected to the fiber combiner 2 through an aspheric lens and a fiber coupling head .

[0037] The optical fiber combiner 1 is connected to the data acquisition processing and control system through the photodetector 1 , and the optical fiber combiner 2 is connected to the data ...

Embodiment 2

[0039] An all-fiber laser detection system for tunnel safety monitoring, its structure is as described in Embodiment 1, the difference is that the optical fiber beam splitter 1 is a 90 / 10 optical fiber beam splitter, and the laser is split by the 90 / 10 optical fiber beam splitter It is the A path with 90% energy and the B path with 10% energy, and the A path is input to the optical fiber splitter 2 .

[0040] The optical fiber beam splitter 2 is a 90 / 10 optical fiber beam splitter, and the A-path laser is then divided into the E-path with 90% energy and the F-path with 10% energy through the 90 / 10 optical fiber beam splitter 2.

[0041] The optical fiber beam splitter 3 is a 45 / 55 optical fiber beam splitter. After passing through the optical fiber modulator, the B-path laser is divided into the C path with 45% energy and the D path with 55% energy through the 45 / 55 optical fiber beam splitter 3.

[0042] The E-path laser is reflected by the mirror, coupled by the aspheric len...

Embodiment 3

[0047]An all-fiber laser detection system for tunnel safety monitoring, its structure is as described in Embodiment 2, the difference is that the data acquisition processing and control system generates a modulation signal to drive the laser.

[0048] The modulation signal is a triangular wave signal, and the wavelength period of the modulation signal is T, T=T1+T2+T3; at the time 0-T1, the sine signal and the rise time triangular wave signal are used to measure the water vapor, and at the time T1-T2, the sine wave is used Signal and rising time triangular wave signal to realize methane measurement; at T2-T3 time, use falling time triangular wave signal to realize displacement and deformation monitoring of the system.

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Abstract

The invention relates to an all-fiber laser detection system for tunnel safety monitoring and a working method, and belongs to the technical field of tunnel safety monitoring. The system comprises a laser, an optical fiber beam splitter 1 is arranged on an output light path, two paths of output of the optical fiber beam splitter 1 are respectively connected to an optical fiber beam splitter 2 andan optical fiber modulator, and the output of the optical fiber modulator is connected to an optical fiber beam splitter 3; two outputs of the optical fiber beam splitter 3 are respectively connectedto an optical fiber beam combiner 1 and an optical fiber beam combiner 2; one path of output of the optical fiber beam splitter 2 is connected to the optical fiber beam combiner 1 through an optical fiber circulator, and the other path of output of the optical fiber beam splitter 2 is connected to the optical fiber beam combiner 2 through an optical fiber coupling head; the optical fiber beam combiner 1 is connected to a data acquisition processing and control system through a photoelectric detector 1, and the optical fiber beam combiner 2 is connected to the data acquisition processing and control system through a photoelectric detector 2. The gas measurement and displacement deformation measurement can be realized at the same time; the gas measurement sensitivity is high, and the displacement deformation measurement accuracy is high.

Description

technical field [0001] The invention relates to an all-fiber laser detection system and working method for safety monitoring in tunnel excavation, belonging to the technical field of tunnel safety monitoring. Background technique [0002] With the development of our country's economy and technology, the traffic mileage of our country's tunnels continues to increase. Tunnel safety is one of the important safety issues in traffic construction. The collapse and dangerous gas in the tunnel can easily cause casualties of construction personnel. In recent years, tunnel construction collapses and poisoning accidents have occurred frequently. Therefore, real-time monitoring of tunnel deformation and dangerous gases has a safety warning effect and reduces accidents. The current deformation and gas monitoring methods use laser rangefinders or portable gas monitors for monitoring. The current detection methods are to use manual shifts to monitor the safety of the tunnel. This detecti...

Claims

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Application Information

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IPC IPC(8): G01D21/02G01N21/39G01B11/02G01B11/16
CPCG01D21/02G01N21/39G01B11/02G01B11/16
Inventor 叶帅夏金宝聂鸿坤张百涛杨克建何京良
Owner SHANDONG UNIV
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