Distributed Fiber Optic Acoustic and Vibration Fusion Sensing System

Abstract

The distributed optical fiber acoustic wave and vibration fusion sensing system of the present invention includes a laser, a 1×2 optical fiber coupler, an acousto-optic modulator, an erbium-doped optical fiber amplifier, a first optical fiber filter, an optical fiber circulator, a first optical switch, Optical fiber Raman amplifier, second optical switch, second optical fiber filter, 3×3 optical fiber coupler, first photodetector, second photodetector, third photodetector, data acquisition and processing unit, computer, host machine software. Advantages: The system combines two sensing functions and modes of vibration and sound wave sensing, which can meet different work requirements, effectively overcome the shortcomings of conventional distributed optical fiber sensing equipment with only single vibration or sound wave sensing, and save costs , is an important technical improvement in the field of distributed optical fiber sensing; it can be flexibly switched according to different usage requirements and scenarios, saving costs and easy to use; it proposes a way to control the optical switch to switch between vibration and acoustic sensing modes, and the operation is flexible.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a distributed optical fiber acoustic wave and vibration fusion type sensing system. Background technique [0002] Optical fiber sensor consists of light source, detection fiber, light modulator, light detector and demodulator. Its working process is to send the light of the light source into the modulation area through the incident optical fiber, and the light interacts with the external measured parameters in the modulation area to make the optical properties of the light (such as intensity, wavelength, frequency, phase, partial normal state, etc.) occur. It becomes modulated signal light, which is then sent to the optical detector and demodulator through the outgoing fiber to obtain the measured parameters. [0003] Distributed optical fiber sensor is a sensor that uses unique distributed optical fiber detection technology to measure or monitor the spatial distribution and...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of conventional distributed optical fiber sensing equipment that only has a single vibration or acoustic wave sensing, the present invention provides a distributed optical fiber acoustic wave and vibration fusion sensing system, which integrates two functions of vibration and acoustic wave sensing

Images