Apparatus and method for discriminating front and back of wide field complete-optical fiber disturbing signal

Abstract

A front-rear discriminating method of wide domain complete optical fiber disturbance signal is principally used in conduit monitoring, such as conduit safety monitoring of various conveying danger or high value chemical industry article, which specially includes: the background terminal controls the operation of the entire wide domain complete optical fiber disturbance testing system, which is divided into two operation modes, a front discriminating rule and a rear discriminating rule; when the system is at the operating system, the systems produces a control command by a control circuit, and the control circuit controls the selection of the detection mode, which allows the system to work at the continuous wave mode or at a pulse mode; in the continuous operating mode, the system detects whether the disturbance sensing signal appears; while in the pulse operating state, the system sends out and detects a location signal, and locates the disturbance sites; in the selected operating mode, the system completes the photo-electric detection relative to the operating mode, the photoelectric signals are amplified and conditioned in the photo-electric detection circuit, and then are captured in a data acquisition module, the captured signals form a disturbance sensing signal processing result after processing.

Description

technical field [0001] The invention is mainly used for pipeline monitoring of various types of dangerous or high-value chemical product pipeline safety monitoring and monitoring. It is a disturbance positioning signal processing technology for a wide-area all-fiber disturbance sensing and positioning system for perimeter security defense, which belongs to the optical fiber Sensing technology field. Background technique [0002] Optical fiber sensing technology is a brand-new sensing technology developed rapidly in the 1970s with the development of optical fiber and optical fiber communication technology. In a nutshell, a fiber optic sensor is a device that uses an optical fiber to modulate the light wave parameters transmitted in the fiber to be measured, and demodulates and detects the modulated light wave signal to obtain the value to be measured. [0003] The principle of the wide-area all-fiber positioning network system is based on the Rayleigh backscattering effect i...

AI Technical Summary

Problems solved by technology

One is the distributed temperature and stress monitoring technology, which mainly uses the nonlinear characteristics of optical fiber (Raman effect and Brillouin effect) to collect the temperature influence and impact stress of external events on the optical fiber in real time to determine the location of the alarm. The structure and the distance between the optical cable and the alarm location will affect the monitoring effect

The other is the sound wave detection technology commonly used in pipeline damage early warning. This technology uses the principle of sound wave transmission along the pipeline, installs an active sensor at a certain distance, collects sound signals along the pipeline for analysis, and determines the nature of the event. Early detection of pipeline damage incidents, but each sensor must be equipped with a power supply device and communication device, which not only increases the investment and maintenance costs of the equipment, but also these facilities themselves are easily damaged, making the system unable to work normally

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