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Distributed monitoring system for structure settlement based on optical fiber ultrasonic wave sensing technology

A technology of distributed monitoring and sensing technology, applied in the field of distributed monitoring system for structural settlement based on optical fiber ultrasonic sensing technology, can solve the problems of lack of reliable technical means, high labor intensity, low operation efficiency, etc. Achieve the effect of long-distance distributed monitoring and data processing, flexible selection and low cost

Inactive Publication Date: 2013-08-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, traditional detection methods are mainly used to measure structural settlement in China, such as inertial measurement, total station method, and leveling measurement. The disadvantages are low precision, low operating efficiency, high manual labor intensity, complex system, low resolution and high price.
Therefore, there is still a lack of reliable technical means to realize long-term distributed real-time online monitoring of structural settlement

Method used

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  • Distributed monitoring system for structure settlement based on optical fiber ultrasonic wave sensing technology
  • Distributed monitoring system for structure settlement based on optical fiber ultrasonic wave sensing technology
  • Distributed monitoring system for structure settlement based on optical fiber ultrasonic wave sensing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Transmissive sensing systems such as figure 1 As shown, the sensing light source 1 emits a continuous optical signal, which is divided into several channels after entering the beam splitter 2, one of which enters the optical fiber ultrasonic sensor 4 through the transmission optical cable 3, and the transmitted optical signal of the sensor 4 is output after passing through the photodetector 5 The current signal is collected by the data acquisition card 6 of the signal demodulation and analysis unit 13, and then the signal analysis and processing device 7 performs time-domain characteristic analysis on the signal to obtain the change of light intensity information contained in the current signal, which is then displayed by the computer Device 8 is displayed. The ultrasonic pulse generator 9 is connected with the pulse generator control unit 10 for generating ultrasonic pulse signals. The pulse generator control unit 10 is simultaneously connected with the data acquisiti...

Embodiment 2

[0028] Reflective sensing systems such as Figure 4 As shown, the sensing light source 1 emits a continuous optical signal, which is divided into two paths after entering the 2×2 fiber optic coupler 11, one of which enters the fiber optic ultrasonic sensor 4 through the transmission optical cable 3, and the fiber optic ultrasonic sensor 4 is placed in the building under test. The ultrasonic pulse generator 9 is placed at the non-settling reference point. When the ultrasonic pulse controlled by the pulse generator control unit 10 is transmitted from the reference point ultrasonic pulse generator 9 and transmitted to the optical fiber ultrasonic sensor 4, the ultrasonic pulse signal detected by the optical fiber ultrasonic sensor 4 is compared with the pulse generation time, and corresponding If the structure under test settles, the characteristics of the time delay of the ultrasonic pulse signal measured by the optical fiber sensor will change. By analyzing the time delay chara...

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Abstract

The invention discloses a distributed monitoring system for structure settlement based on an optical fiber ultrasonic wave sensing technology. The distributed monitoring system for structure settlement based on the optical fiber ultrasonic wave sensing technology comprises an ultrasonic wave pulse emitter, an optical fiber beam splitter, a pulse generator control unit, an optical fiber ultrasonic wave sensor, a transmitting optical cable, a sensing light source, an optical fiber beam splitter and a signal demodulation and analyzing unit; the structure of the optical fiber ultrasonic wave sensor is a single-mode optical fiber-great-core-diameter optical fiber-single-mode optical fiber type which is formed by welding two single-mode optical fibers at two ends of a great-core-diameter optical fiber; the sensing light source is connected with the input end of the beam splitter through the transmitting optical cable; the output end of the beam splitter is connected with the input end of the optical fiber ultrasonic wave sensor; and the output end of the optical fiber ultrasonic wave sensor is connected with the signal demodulation and analyzing unit. The distributed monitoring system for structure settlement based on the optical fiber ultrasonic wave sensing technology has the advantages of high flexibility, good accuracy, good long-term property, high anti-interference capability, high reliability, flexible working reference point selection, capability of achieving long-distance distributed monitoring and data treatment, simple structure, and high cost of performance of a sensing system.

Description

technical field [0001] The invention relates to a distributed optical fiber monitoring system based on optical fiber ultrasonic technology and a monitoring method thereof, which can realize settlement monitoring of bridges, tunnels and other various structures. Background technique [0002] The settlement monitoring of the structure is a part of the structural health monitoring. The structural information of the structure is obtained through various non-destructive testing methods, and the safety evaluation and necessary early warning are made. Structural settlement monitoring Difficulties in the field of structural health monitoring. At present, traditional detection methods are mainly used to measure structural settlement in China, such as inertial measurement, total station method, and leveling measurement. The disadvantages are low precision, low operating efficiency, high manual labor intensity, complex system, low resolution and high price. . Therefore, there is stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C5/00
Inventor 孙安吴智深
Owner SOUTHEAST UNIV
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