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Linear multi-channel fiber acoustic vibration sensing device and method

A vibration sensing and vibration sensor technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of large number of transmission fibers, complicated maintenance and layout, and sensors cannot be directly connected in series, so as to improve the multiplexing. degree, reduce wastage, and improve the effect of utilization

Active Publication Date: 2015-03-11
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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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  • Linear multi-channel fiber acoustic vibration sensing device and method
  • Linear multi-channel fiber acoustic vibration sensing device and method
  • Linear multi-channel fiber acoustic vibration sensing device and method

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Embodiment Construction

[0034] The present invention will be further described in detail below in combination with specific embodiments.

[0035] Such as image 3 As shown, a linear multi-channel optical fiber acoustic vibration sensing device of the present invention includes: a light source 13, a transmission optical fiber 16, N miniature all-fiber relay multiplexers 14, 15, ... , 17, N≤64; N optical fiber acoustic vibration sensors 10 and an optical signal analyzer 18 . in:

[0036] Light source 13: SLD light source or ASE light source that provides a wide spectrum, and the working band is 1310nm or 1550nm;

[0037] Transmission optical fiber 16: used to connect the light source in the optical fiber acoustic vibration sensing device, the miniature all-fiber relay multiplexer and the optical signal analyzer;

[0038] N miniature all-fiber relay multiplexers 14, 15, ..., 17, N≤64, each miniature all-fiber relay multiplexer has three ports, one of which is used to connect the fiber optic acoustic ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 刘铁根江俊峰刘琨赵鹏王双尹金德宋璐瑶吴凡
Owner TIANJIN UNIV
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