Optical fiber vibration detection method and device

Abstract

The invention discloses an optical fiber vibration detection method and device, wherein the method comprises the steps of: receiving an optical fiber vibration measuring sequence, and utilizing a vibration signal detection model established in advance for carrying out vibration signal detection on the optical fiber vibration measuring sequence so as to extract suspected vibration source data; and utilizing a sequential probability ratio detection model for detecting the suspected vibration source data, and confirming whether the suspected vibration source data is a real vibration source. According to the relation between a zero-crossing detection model and sequential probability ratio detection, a multi-stage vibration source detection algorithm is provided, so that the vibration source detection speed is substantially improved, the false alarm rate is stabilized in a controllable range, and the weak vibration source detection capability is simultaneously improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber vibration signal measurement and random signal processing, in particular to an optical fiber vibration detection method and device based on sequential probability ratio SPRT. Background technique [0002] The underground pipelines known as the city's "lifeline" are intricate and complex. While they are convenient for urban life, they also pose great safety hazards due to improper construction and unfavorable supervision, which may cause huge losses of personnel and property, and are even called local residents. "Deadline". Therefore, the safety early warning of underground pipelines is particularly important, and it is one of the focuses of current research. [0003] The detection and alarm systems currently used mainly include the following methods: electronic pulse fence, microwave wall alarm, active infrared alarm, leaking cable perimeter detection and alarm system, electret vibration ca...

AI Technical Summary

Problems solved by technology

[0004] There are still obvious deficiencies in the existing optical fiber vibration signal processing. The design idea is generally a direct detection method, which directly transmits the detected signal to the display, and displays the amplitude changes of clutter and noise at the same time. The detection of the target signal Capability determined by operator monitoring of display

like figure 1 As shown, the existing optical fiber vibration signal processing flow, the research work is concentrated in the field of feature extraction, the amplitude characteristics of the signal are extracted, and the extracted characteristics are compared with the threshold, and the alarm is issued according to the comparison result. This method has large errors and alarms. Inaccurate

Moreover, a single-level alarm cannot take into account the performance of both false alarms and detection

Images