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Method for measuring multidirectional displacement by using multi-core fiber

A multi-core optical fiber and multi-directional technology, applied in the field of optical fiber, achieves the effect of high measurement accuracy

Active Publication Date: 2016-02-24
ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no practice of using multi-core optical fiber for physical quantity measurement in the market, especially for multi-directional displacement measurement

Method used

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  • Method for measuring multidirectional displacement by using multi-core fiber
  • Method for measuring multidirectional displacement by using multi-core fiber
  • Method for measuring multidirectional displacement by using multi-core fiber

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Embodiment Construction

[0023] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] The equipment used in the multi-directional displacement measurement of the multi-core optical fiber in the present invention includes a laser, a fiber grating demodulator, a fan-out device, a photodetector, an acquisition card and a computer, wherein the laser is used as a light source, and the multi-core optical fiber and the photodetector are connected together. The connected fan-out device is also an important part of the measurement system. Its function is to output each fiber core of the connected multi-core fiber in the form of a single-mode fiber, and the single-mode fiber is placed in a V-groove array. When installing, firstly couple the V-groove array composed of four single-mode optical fibers to the V-groove port of the fan-out device, and adjust it by using reflectivity matching gel and a manual three-dimensional translation...

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Abstract

The invention provides a method for measuring multidirectional displacement by using a multi-core fiber, and the method comprises the steps of making reflected light at the fiber transverse plane and reflected light of a minute surface object form interference by utilizing reflection and transmission of the 45 DEG minute surface of the multi-core fiber; then demodulating a chamber length change based on an algorithm that takes rapid Fourier transform as the basis, thereby measuring the displacement of the object in multiple directions. The method is high in measurement precision.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a method for measuring multi-directional displacements using multi-core optical fibers. Background technique [0002] Optical fibers have many excellent properties, such as: anti-electromagnetic interference and atomic radiation properties; thin, soft, light-weight mechanical properties; electrical properties of insulation and non-induction; chemical properties of water resistance, high temperature resistance, and corrosion resistance, etc. Therefore, fiber optic sensors can be used to measure various physical quantities, such as sound field, electric field, pressure, strain, temperature, velocity, displacement, etc. At present, the application of optical fiber is mainly based on single-core optical fiber. However, since only one beam of light is transmitted in single-core optical fiber, physical quantities in one direction can only be measured. With the continuous develo...

Claims

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Application Information

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IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 李俊徐胜明董凤忠罗渊敏朱莉莎
Owner ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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