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Three-dimensional shape sensing measurement method and device based on multi-core fibers

A multi-core fiber, three-dimensional shape technology

Inactive Publication Date: 2019-01-11
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is very complicated when installing and arranging the sensor, and it will cause installation errors

Method used

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  • Three-dimensional shape sensing measurement method and device based on multi-core fibers
  • Three-dimensional shape sensing measurement method and device based on multi-core fibers
  • Three-dimensional shape sensing measurement method and device based on multi-core fibers

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Experimental program
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Effect test

Embodiment

[0070] Embodiment: The three cores of the three-core optical fiber symmetrically distributed are connected to the three channels of the fiber grating sensor analyzer using FC-type optical fiber connectors. The probe light from the analyzer enters the three-core fiber through the three-core fiber fan-in and fan-out module. First fix the three-core optical fiber along the diagonal of the paper, preferably on the diagonal of the 21cm×29.7cm paper, make the three-core optical fiber in a straight state for testing, and store the three-core optical fiber before the shape changes Fiber grating Bragg center wavelength in each fiber core; Then the paper that is fixed with three-core optical fiber is rolled into cylinder shape, preferably, cylinder diameter 6.8cm, as Figure 7 As shown, the three-core optical fiber is tested when it is in a helical state. The fiber grating sensor analyzer measures that the center wavelength of the fiber grating Bragg in each core of the three-core optic...

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Abstract

The invention discloses a three-dimensional shape sensing measurement method and device based on multi-core fibers, and belongs to the technical field of fiber shape sensing measurement. According tocentral wavelengths of fiber Bragg gratings before and after shape change of the multi-core fibers, maximum strain of the fiber gratings and curvatures and torsion angles of the positions where the cross sections of the fiber gratings are located are calculated, interpolation of the curvatures and the torsion angles is conducted on the multi-core fibers, three-dimensional shape reconstitution is conducted through a three-dimensional reconstruction algorithm, then displaying on a computer is conducted, and three-dimensional shape sensing measurement of the multi-core fibers is achieved. The measurement device comprises the computer, a fiber grating sensing analyzer and a multi-core fiber fan-in and fan-out module. A full-fiber structure is combined with the fiber grating measurement strain,by changing the distance between every two adjacent fiber gratings and the number of the fiber gratings, the measurement precision can be improved, the mounting error is eliminated through the adopted multi-core fibers, later maintenance, replacement and mounting are facilitated, and reliability is higher.

Description

technical field [0001] The invention belongs to the technical field of optical fiber shape sensing measurement methods and systems, and in particular relates to a multi-core optical fiber-based three-dimensional shape sensing measurement method and device. Background technique [0002] Three-dimensional shape sensing measurement is the shape measurement of flexible and bendable objects, which has great development potential in the fields of aerospace, medical equipment, oil exploration, robot search and rescue, etc. Due to the structure of the measuring instrument and the separation of the detection principle, the traditional method of using laser scanning, machine vision and other non-contact optical detection technologies for 3D shape sensing measurement is difficult to implement in some occasions, such as electromagnetic interference or easily In the harsh environment of flammable and explosive, the three-dimensional shape sensor based on electrical signal measurement is ...

Claims

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Application Information

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IPC IPC(8): G01B11/24G01B11/255
CPCG01B11/24G01B11/255
Inventor 金靖朱云鸿张浩石
Owner BEIHANG UNIV
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