Distributed Fiber Optic Vibration Sensing System Based on Differential Pulse Sequence

A technology of vibration sensing system and distributed optical fiber, which is applied in the direction of instruments, measuring devices, using wave/particle radiation, etc., can solve the problem of low spatial resolution, improve the signal-to-noise ratio of demodulated signals, high-precision detection, The effect of increasing the number of sampling points

Active Publication Date: 2016-04-13
成都塔科光电技术有限公司
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Problems solved by technology

[0004] In the prior art, research on vibration sensing systems based on fiber optic technology has been very extensive, but the existing measurement methods all have low-frequency measurement while accurate vibration position measurement, or high-frequency vibration measurement but low spatial resolution. low problem

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  • Distributed Fiber Optic Vibration Sensing System Based on Differential Pulse Sequence
  • Distributed Fiber Optic Vibration Sensing System Based on Differential Pulse Sequence

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a "first" element discussed below could also be termed a "second" element without departing from the teachings of the present invention. It will be understood that when an element is referred to as being "con...

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Abstract

The invention discloses a distributed optical fiber vibration sensing system based on a differential pulse sequence. The distributed optical fiber vibration sensing system comprises a light source, a first coupler, first to Nth acoustic optical modulation devices, (N-1) delay optical fibers, a second coupler, an erbium-doped optical fiber amplifier, an optical filter, a three-port circulator, a long-distance sensing optical fiber, a third coupler, a photoelectric detector, a high-pass filter, a frequency mixer, a function generator, a low-pass filter and a data acquisition card. The distributed optical fiber vibration sensing system based on the differential pulse sequence can achieve measurement of a high-frequency vibration signal within a long-distance range and accurate position judgment and can reduce the system cost to certain extent.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system, in particular to a distributed optical fiber vibration sensing system based on a differential pulse sequence. Background technique [0002] Vibration measurement has potential application value in engineering fields, such as structural health monitoring, aerospace, petrochemical, power system and other safety monitoring. Traditional vibration measurement methods, such as mechanical measurement and electrical measurement, have problems such as low sensitivity, large volume, and measurement range limited by amplifier devices, and traditional vibration measurement methods can only perform point measurement, which is limited in practical applications. Therefore, it is imperative to develop a high-performance vibration measurement system. [0003] Distributed optical fiber sensing technology refers to the continuous modulation of the light wave in the optical fiber by the extern...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 朱涛何茜
Owner 成都塔科光电技术有限公司
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