Linear multi-channel fiber acoustic vibration sensing device and method

Abstract

The invention discloses linear multi-channel fiber acoustic vibration sensing device and method. The linear multi-channel fiber acoustic vibration sensing device comprises a light source, a transmission fiber, micro all-fiber relay multiplexers, fiber acoustic vibration sensors and an optical signal analyzer. The light source, the micro all-fiber relay multiplexers and the optical signal analyzer are in linearly series connection through the transmission fiber, probe light is input to the fiber acoustic vibration sensors via the micro all-fiber relay multiplexers, and after acoustic modulation, optical signals are returned to the optical signal analyzer along the transmission fiber so to be processed. Linearly series connection of multiple fiber acoustic vibration sensors can be realized, system complexity is reduced effectively, and synchronous measurement is achieved. In addition, the linear multi-channel fiber acoustic vibration sensing device is adaptable to various application fields, and a flexible and variable acoustic vibration sensing network can be constructed.

Description

technical field [0001] The invention relates to the technical field of acoustic vibration sensing, and is applicable to the detection of signals such as sound waves, shock waves and vibrations. Background technique [0002] The acoustic vibration sensor composed of optical fiber technology can work in harsh environments such as toxic, flammable, explosive, and small spaces because it is not subject to electromagnetic interference. It has broad application prospects in sound collection, engine noise, environmental noise and other fields. [0003] Fiber-optic acoustic vibration sensors based on Fabry interference microcavities have attracted more attention due to their high sensitivity and high-fidelity real-time monitoring of acoustic vibration sources. In many applications, it is often necessary for multiple fiber optic acoustic vibration sensors to work together to achieve multi-point simultaneous measurement in order to better restore the information of the acoustic vibra...

AI Technical Summary

Problems solved by technology

Due to the FP cavity structure of the fiber optic acoustic vibration sensor, the sensors cannot be directly connected in series, and because the measurement object is a rapidly changing signal, the current common multi-point measurement method is to equip a fiber acoustic vibration sensor with a demodulation unit, or use a Demodulation unit and optical switch are used for star wiring (each channel cannot work at the same time, only one channel can be selected for use at a time), and each optical fiber acoustic vibration sensor needs to prepare a separate transmission fiber to connect to the demodulation unit. When there are many measurement points or the distance between them is large, the number of transmission fibers required will be very large, and maintenance and layout will become complicated

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