Distributed vibration sensor based on multi-carrier nonlinear frequency modulation

A non-linear frequency modulation and vibration sensor technology, applied to instruments, using wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as low spatial resolution and poor anti-fading performance, and improve the system signal-to-noise ratio , Eliminate distortion, improve the effect of spatial resolution

Active Publication Date: 2021-01-05
CHONGQING UNIV
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Problems solved by technology

[0004] The invention provides a distributed vibration sensor based on multi-carrier nonlinear frequency modulation to solve the problems of low spatial resolution and poor anti-fading performance existing in long-distance distributed vibration sensors

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  • Distributed vibration sensor based on multi-carrier nonlinear frequency modulation
  • Distributed vibration sensor based on multi-carrier nonlinear frequency modulation
  • Distributed vibration sensor based on multi-carrier nonlinear frequency modulation

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Embodiment Construction

[0030]In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objectives, features, and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings. Give further details.

[0031]In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be a communication between two components, which can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032]Seefigure 1 , Is a schem...

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Abstract

The invention provides a multicarrier nonlinear FM based distributed vibration sensor. A narrow linewidth laser of the sensor transmits a local oscillation optical signal to a first coupler, the firstcoupler transmits the local oscillation optical signal to a light modulation unit, the light modulation unit modulates the local oscillation optical signal into a multicarrier nonlinear FM optical signal, a light amplifier amplifies the multicarrier nonlinear FM optical signal, a bandpass light filter carries out bandpass filtering on the amplified multicarrier nonlinear FM optical signal, and the multicarrier nonlinear FM optical signal after bandpass filtering is transmitted to a sensing finber; and based on a Rayleigh scattering effect, the sensing fiber generates a multipath Rayleigh scattering signal corresponding to the multicarrier nonlinear FM optical signal, a first photoelectric detector converts the local oscillation optical signal provided by the first coupler and the multipath Rayleigh scattering signal into a first electric signal, and vibration information of vibration points in the sensing fiber is measured according to the first electric signal. The spatial resolutionand anti-fading performance of vibration sensing can be both improved.

Description

Technical field[0001]The invention belongs to the field of vibration detection, and in particular relates to a distributed vibration sensor based on multi-carrier nonlinear frequency modulation.Background technique[0002]In the health monitoring and diagnosis of large-scale building structures, aerospace, petrochemical, power systems and other major projects and infrastructures, optical fiber sensing technology has gradually developed due to its small sensitive components, high durability, absolute measurement and distributed monitoring. It is a trend to replace electrical sensors as the first choice for sensory health monitoring. Among them, the technical research and application of the distributed monitoring of vibration in a long distance using optical fiber are continuously deepening.[0003]In the prior art, the current solutions for long-distance distributed vibration sensing mainly rely on optical amplification in the sensing fiber to compensate for the attenuation of pump light...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 朱涛张敬栋
Owner CHONGQING UNIV
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