Three-dimensional shape measurement method

A measurement method and technology of three-dimensional shape, which can be applied to measurement devices, instruments, optical devices, etc., can solve problems such as writing gratings, and achieve the effect of reducing implementation costs and simplifying manufacturing processes and processes.

Active Publication Date: 2016-03-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The embodiment of the present invention provides a three-dimensional shape measurement method, which solves the technical problem of writing a large number of gratings into the multi-core optical fiber in the prior art, realizes a technology that simplifies the manufacturing process and flow of the sensor, and reduces the implementation cost Effect

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Embodiment 1

[0046] see figure 2 , the three-dimensional shape measurement method provided by the embodiment of the present invention, comprising:

[0047] Step S110: Measure the stress value ε of the fiber core i containing the eccentric core based on the distributed measurement system i ;

[0048] In this embodiment, the distributed measurement system includes but is not limited to BOTDR (Brillouinopticaltime-domainreflectometry, Brillouin optical time domain reflectometry), BOTDA (Brillouinopticaltime-domainanalysis, Brillouinoptical time domain analyzer), BOCDR (Brillouinopticalcorrelationdomainreflectometry, Brillouin correlation domain reflectometer), BOCDA (Brillouinopticalcorrelationdomainanalysis, Brillouin correlation domain analyzer), BOFDA (Brillouinopticalfrequencydomainanalysis, Brillouin optical frequency domain analyzer), OFDR (Opticalfrequencydomain reflectometry, optical frequency domain reflectometry), C-OTDR (Coherentoptical time-domain reflectometer, coherent optica...

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Abstract

The invention discloses a three-dimensional shape measurement method. The method comprises steps: based on a distributed measurement system, a stress value of an optical fiber core with an eccentric fiber core is measured; a vector and an intermediate variable are acquired; a bent angle of each point in an optical fiber link is acquired; a torsion function is acquired; a curvature function is acquired; a tangent vector is acquired; and a curve in three-dimensional space is acquired. The fact that a fiber Bragg grating is inscribed in a multi-core optical fiber in the prior art is not needed, the distributed sensor based on the method of the invention is convenient to make and convenient to demodulate, the making process and the steps for the sensor are simplified, and the implementing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a three-dimensional shape measurement method. Background technique [0002] Optical fiber sensors have the advantages of small size, wide frequency band, high sensitivity, no electromagnetic interference, corrosion resistance, high temperature resistance, high pressure resistance, and adaptability to harsh environments. They have been widely used in temperature, stress, pressure, curvature, and refractive index. , acceleration, humidity, electric field, magnetic field, liquid level and other parameters in the measurement. [0003] Distributed optical fiber sensing technology is a technology that uses every point on the optical fiber link as a sensing element. The optical fiber is not only used as an information transmission medium, but also as a sensing element. It can continuously measure the environmental parameters distributed along the optical fiber. Such as te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/18
Inventor 唐明赵志勇付松年童维军李博睿韦会峰
Owner HUAZHONG UNIV OF SCI & TECH
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