Earthquake early-warning system based on communication optical cable

A communication optical cable, earthquake early warning technology, applied in the direction of earthquake signal receiver, optical fiber/cable installation, alarm, etc., can solve the problem of slow propagation speed, achieve the effect of high utilization rate, dense distribution, and outstanding system damage resistance

Inactive Publication Date: 2009-03-25
FUDAN UNIV
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Problems solved by technology

Seismic waves are divided into transverse waves and longitudinal waves. Among them, transverse waves ar

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  • Earthquake early-warning system based on communication optical cable
  • Earthquake early-warning system based on communication optical cable
  • Earthquake early-warning system based on communication optical cable

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Embodiment Construction

[0023] The invention according to figure 1 The earthquake early warning system based on communication optical cable is shown in the figure. The optical feedback device is connected to one end of the laid communication optical cable, and the other end of the communication optical cable is connected to the optical cable vibration information extraction device. The output signal of the optical cable vibration information extraction device is collected into the computer for signal processing through the data acquisition card, and the optical cable vibration is constructed through the software algorithm. Information processing platform.

[0024] The communication optical cable occupies 1 channel in the communication line. It can be applied to old lines that have been laid and have 1 channel reserved, and can also be applied to newly designed lines. The monitoring range of the system can reach more than 100km.

[0025] The function of the optical feedback device is to reflect the...

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Abstract

The invention relates to an earthquake warning system based on communication optical cables. The system can perform real-time monitoring on geological conditions in the area where optical cables are laid, and judge whether an earthquake occurs according to the vibration information from the optical cable, and uses the difference between the seismic wave transmission speed and the light transmission speed to realize early warning function; and the earthquake warning system can transmit threatening strong earthquake information to various towns which can be threatened a few seconds or even more in advance so as to reduce the loss caused by a strong earthquake as possible. The system can also be used for monitoring vicious incidents such as local geologic hazards like landslides and mudflows, and man-made destruction, and has the advantages of wide monitoring range, high sensitivity, good reliability, low cost and high utilization rate.

Description

technical field [0001] The invention relates to an earthquake early warning system based on communication optical cables, belonging to the field of optical cable monitoring and earthquake early warning. Background technique [0002] Earthquake early warning means that after an earthquake occurs, before the seismic wave propagates to the fortified area, an alarm is issued to the fortified area for a few seconds to tens of seconds in advance to reduce local losses. [0003] At present, many earthquake early warning systems have been developed and used in the world, and the technology used is generally based on the time difference between the shear wave and the longitudinal wave of the seismic wave. Seismic waves are divided into transverse waves and longitudinal waves. Among them, transverse waves are the main cause of disasters, but their propagation speed in the crust is relatively slow, about 4km / s. The direction of longitudinal wave propagation is consistent with the dire...

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Application Information

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IPC IPC(8): G01V1/18G01H9/00G08B21/10G02B6/50
Inventor 贾波吴红艳唐璜
Owner FUDAN UNIV
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