Gas leak detection device and method based on low coherence fiber optic microphone

Abstract

The present invention discloses a gas leakage detection device based on a low coherent fiber microphone. The device comprises an ASE light source, an isolator, a coupler A, a delay fiber, a coupler B, a fiber microphone probe, a photoelectric detector A, a photoelectric detector B, a signal collection system, and a signal analysis system based on the LabVIEW. The present invention further discloses a gas leakage detection method which comprises: emitting light from the ASE light source to reach the surface of the vibrating diaphragm of the fiber microphone probe and then return back to the two photoelectric detectors; converting the light signals to electric signals and transmitting the electric signals to the signal collection system for processing; and performing demodulation analysis of the signals by employing the LabVIEW, and obtaining the characteristic frequency spectrum information of the gas leakage. The gas leakage detection device and method based on the low coherent fiber microphone have high measurement sensitivity and resolution ratio, can finely display the frequency domain distribution of gas leakage acoustic emission signals, are simple in structure, low in making cost and high in anti-jamming capability; and moreover, the passive mode-type design simplifies the system so as to realize the larger dynamic measurement range.

Description

technical field [0001] The invention belongs to the technical field of low-coherence measurement and gas leakage detection, and in particular relates to a gas leakage detection device and method based on a low-coherence passive demodulation fiber optic microphone. Background technique [0002] In contemporary industry, the safe storage and delivery of flammable, explosive and toxic chemical gases is very important. Gas tanks and gas pipelines are the main equipment for storing and transporting gas. Due to long-term use and aging and corrosion of chemical gases, gas tanks and gas pipelines are prone to leakage, which may cause safety accidents or cause environmental pollution. Efficient real-time monitoring of pipeline gas leakage is an extremely important link. [0003] At present, the methods for detecting gas leakage can be divided into hardware-based, software-based and non-technical methods according to the technical nature. Among them, the non-technical methods mainly ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing gas leakage detection method, one of the objects of the present invention is to provide a gas leakage detection device based on a low-coherence optical fiber microphone, which includes: ASE light source, isolator, coupler A, delay fiber, coupling Device B, fiber optic microphone probe, photodetector A, photodetector B, signal acquisition system, signal analysis system based on LabVIEW;

Images