Active detecting type fiber grating cable tunnel security and protection monitoring system

A fiber grating and cable tunnel technology, which is used in measuring devices, anti-theft alarms, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of passive fiber gratings such as difficult weak signal detection, complex signal analysis, and poor positioning accuracy. Achieve the effects of facilitating marketing and engineering applications, reducing environmental interference, and improving discrimination

Active Publication Date: 2013-07-17
SHIJIAZHUANG POWER SUPPLY +2
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Problems solved by technology

[0003] Chinese patent CN201110423977.0 discloses a fiber grating perimeter anti-intrusion system, which can be networked on a large scale and accurately determine the mode and position of vibration signals, but the resolution of passive fiber gratings is difficult to detect weak signals, such as Sound and Seismic...

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  • Active detecting type fiber grating cable tunnel security and protection monitoring system

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Embodiment 1

[0013] Example 1 (see figure 1 ):

[0014] In this embodiment, a pump light source 1, a first coupler 2, a hydrophone 3, a low-frequency vibration sensor 4, an optical isolator 5, a second coupler 6, an unbalanced Mach-Zehnder interferometer 15, a wavelength selector 9, Photodetector 10, PZT driver 11, digital collector 12, PGC phase demodulator 13 and computer 14 with alarm information management platform are composed; the pumping light source 1 sends a 980nm pumping laser, which enters the first A coupler 2, the corresponding output terminal of the first coupler 2 is connected with an optical cable equipped with a hydrophone 3 and more than two low-frequency vibration sensors 4, and each of the wavelengths of the hydrophone 3 and more than two low-frequency vibration sensors 4 is Not the same, and equidistant distribution;

[0015] The right end of the first coupler 2 in the system is connected to the detection optical cable, which is first connected to a hydrophone 3 fill...

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Abstract

The invention relates to an active detecting type fiber grating cable tunnel security and protection monitoring system. The active detecting type fiber grating cable tunnel security and protection monitoring system consists of a pump light source, a first coupler, a hydrophone, a low-frequency vibration sensor, an opto-isolator, a second coupler, a non-equilibrium Mach-Zehnder interferometer, a wavelength selector, a photoelectric detector, a piezoelectric transducer (PZT) driver, a digital acquisition device, a program gain control (PGC) phase demodulator and a computer provided with an alarm information managing platform. The active detecting type fiber grating cable tunnel security and protection monitoring system has the advantages of adopting a fiber grating sensor technology, being anti-electromagnetic-interference, electrically insulating, corrosion-resisting, good in safety, long in service life and easy to network, achieving remote distributed measurement and the like, has high sensitivity of an interference type demodulating system, can monitor sound inside and outside a cable tunnel and vibration produced by invaded people, reduces false alarm rate, improves identification on alarm events and operation safety supervision level of a power system and provides a safe and effective management mode for a power transmission system.

Description

technical field [0001] The invention relates to a comprehensive security monitoring system for cable tunnels based on active detection fiber grating sensing technology, which belongs to the field of security monitoring systems. Background technique [0002] The use of cable tunnels is an important measure to meet the high load density and cable-based power supply requirements in central urban areas, effectively guarantee the transmission capacity of power channels and improve the utilization of channel resources. With the rapid development of urban power cable tunnels, expensive equipment and long-distance space in cable tunnels require more sensitive, comprehensive and intelligent security systems to ensure the safety of cable tunnels and prevent dangerous accidents. [0003] Chinese patent CN201110423977.0 discloses a fiber grating perimeter anti-intrusion system, which can be networked on a large scale and accurately determine the mode and position of vibration signals, b...

Claims

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Application Information

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IPC IPC(8): G08B13/00G01H9/00
Inventor 王慧明赵立刚刘国平赵平曾军吴仁虎邢昆徐亚兵郭涛武彦明
Owner SHIJIAZHUANG POWER SUPPLY
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