A chaotic laser interference multi-zone intrusion target early warning system

Abstract

The invention discloses a multi-defence-area invading object early-warning system of a chaotic laser interference type. The chaotic laser emitted by a chaotic laser source is modulated into three ways, and the three ways of light with different wavelength ranges are mixed and then are injected into an optical path. Detection light passes through an optical fiber to be divided into two ways which are connected with sensing probes in different defence areas, so as to monitor the invasion conditions in different defence areas. When an object invades a defence area, a signal processing device controls an acoustic-optical modulator and a photoswitch to change an optical signal in an input optical path and transmit the optical signal to a photoelectric detector in the corresponding defence area,and then the signal processing device ignites a land mine in the defence area after photoelectric conversion. The device utilizes the broad spectrum and related principle of chaotic laser to improvethe sensitivity of the device to sound signals, and realizes real-time monitoring and control of multiple defence areas by using the photoswitch and an optical filter. Meanwhile, the device realizes real-time processing of signals through an ARM module, and can achieve the effective early warning of the invasion of an important defence area.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a chaotic laser interference multi-zone intrusion target early warning system. Background technique [0002] The security defense of important places such as military bases is the highest level in the security level. Some commonly used security methods have certain defects and cannot be applied to important places such as military bases. For example, infrared radiation and microwave alarm methods need to directly deploy sensors, which are greatly affected by terrain and can only be used in relatively open areas with small defense areas; pulsed electronic fences consume a lot of power and cannot be used in flammable and explosive places; video surveillance The system requires 24 / 7 power supply, which consumes a lot of power and is prone to monitoring dead angles. The above security measures are susceptible to electromagnetic interference and cannot funct...

AI Technical Summary

Problems solved by technology

However, the traditional distributed optical fiber sound detection device based on Sagnac interference can only pick up the sound signal of a single defense zone, and cannot transmit command information through the system optical path after the defense zone is invaded, and cannot realize two-way communication in a single optical cable, and the traditional Sagnac sound The detection device uses a broadband light source, the detection distance is short, the sound detection effect is poor, and there are big problems in practical applications

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