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Time-division multiplexing array fiber grating real-time monitoring system for seismic waves

A real-time monitoring system, fiber grating technology, applied in seismology, geophysical measurement, using wave/particle radiation, etc., can solve the problems of small dynamic range, low precision, and lack of real-time performance, and achieve a large dynamic range , high precision, and easy distributed measurement

Inactive Publication Date: 2016-01-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In view of the deficiencies of the existing seismic wave detection system technology, including low precision, small dynamic range, inability to locate and real-time performance, etc.

Method used

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  • Time-division multiplexing array fiber grating real-time monitoring system for seismic waves
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  • Time-division multiplexing array fiber grating real-time monitoring system for seismic waves

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Embodiment Construction

[0023] The present invention proposes a time-division multiplexing array seismic wave real-time monitoring system based on fiber gratings. The system has the characteristics of high precision, large dynamic range, distribution and real-time performance, and can monitor seismic waves in real time to realize earthquake early warning. In view of the deficiencies of the existing seismic wave detection system technology, including low precision, small dynamic range, inability to locate and lack of real-time performance, etc., the present invention adopts the following technical solutions:

[0024] Option One:

[0025] Such as figure 1 A set of seismic wave real-time monitoring system designed by the present invention is set up. In order to adopt time-division multiplexing technology, the system light source adopts a super-radiation broad-spectrum pulsed light source (SLD). The spectrum of the light source covers the reflection spectrum of all fiber grating arrays. The time it take...

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Abstract

The invention discloses a real-time monitoring system for time-division multiplexing array fiber grating seismic waves. The system uses a super-radiation wide-spectrum pulse modulation light source, uses a fiber grating-based sensing head array to collect seismic wave information, and adopts a waveguide-type unbalanced M-Z demodulation system. The seismic wave information is demodulated in real time, and the demodulated signal is received and processed by the photoelectric detector system to obtain the seismic wave component information, and the seismic source is located by the OTDR system. The invention has the advantages of high precision and large dynamic range, and can realize real-time monitoring and high-precision positioning of seismic waves by using the scheme.

Description

technical field [0001] The invention relates to the technical field of vibration sensors based on optical fiber gratings, including the technical field of wavelength demodulation of optical fiber grating sensors and the technical field of optical fiber positioning systems, in particular to a time-division multiplexing array fiber grating real-time monitoring system for seismic waves. Background technique [0002] An earthquake is a sudden and extremely destructive natural disaster. A strong earthquake will cause building collapse, facility damage, traffic jams, and dam breaches within seconds or minutes. A strong earthquake not only directly causes huge damage, but also At the same time, it also leads to a variety of secondary disasters, such as fires, floods, landslides, tsunamis, etc., causing casualties, bringing huge loss of life, property and economy to human beings, and affecting the stable development of society. Earthquake prediction is very difficult, and earthquake...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00G01H9/00
Inventor 岳慧敏胡泽雄刘永智胡云李剑锋欧中华刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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