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Preparation method of twisted optical fiber segment, optical fiber twist sensor and testing device thereof

A testing device and sensor technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of not being able to identify the torsion direction, and achieve the effects of low cost, fast response speed, and simple preparation method

Active Publication Date: 2020-01-21
成都塔科光电技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical fiber twist sensor based on intensity measurement usually uses the change of light intensity to characterize the twist size, which has the advantages of low cost of measurement equipment and fast response speed, but the proposed intensity measurement fiber optic twist sensor cannot identify the twist direction

Method used

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  • Preparation method of twisted optical fiber segment, optical fiber twist sensor and testing device thereof
  • Preparation method of twisted optical fiber segment, optical fiber twist sensor and testing device thereof
  • Preparation method of twisted optical fiber segment, optical fiber twist sensor and testing device thereof

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Embodiment 1

[0026] An embodiment of the present invention provides an intensity-modulated optical fiber twist sensor that can identify the twist direction. The device structure can be obtained by processing a common single-mode optical fiber 3 with a carbon dioxide laser. An interferometer formed by changing the light intensity of its intermode interference. Compared with other sensors, the torsion sensor based on this structure has the characteristics of identifiable torsion direction, only needs a single wavelength to measure light intensity to realize torsion measurement, large measurement range, low cost, etc., and has broad application prospects in engineering monitoring.

[0027] Such as figure 2 As shown, the embodiment of the present invention provides a structure and sensing principle of an intensity-modulated optical fiber twist sensor that can identify the twist direction, and describes a method based on an online Mach-Zehnder interferometer in a standard single-mode fiber (SM...

Embodiment 2

[0035] The preparation method of twisted optical fiber section 4 in the embodiment of the present invention, its preparation device is as figure 1 As shown, it includes: firstly, connect the broadband light source 1 to one end of the single-mode optical fiber 3, the middle part of the single-mode optical fiber 3 is fixed between the first rotatable clamp 71 and the second rotatable clamp 72, and the other end of the single-mode optical fiber 3 One end is connected with the spectrometer 5; then, the second rotatable clamp 72 is twisted 760° clockwise in advance; then, the distance between the first rotatable clamp 71 and the second rotatable clamp 72 on the single-mode optical fiber 3 by the carbon dioxide laser is 0.03m The two points were repeatedly exposed to laser light for 13 times, and the spectrum measured by spectrometer 5 was observed at the same time. At this time, the contrast of the interference spectrum measured by spectrometer 5 was 0.961, which was greater than 0....

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Abstract

The invention provides a manufacturing method of a twisty optical fiber section. The manufacturing method comprises the following steps that a broadband light source is connected with one end of a single mode fiber, and a spectrograph is connected with the other end of the single mode fiber; two ends of the single mode fiber are respectively fixed to a first rotatable clamp and a second rotatableclamp which are spaced for a certain distance the second rotatable clamp turns clockwise or anticlockwise for a certain angle; a carbon dioxide laser conducts repeated laser exposure on two non-end points on one section of single mode fiber clamped between the first rotatable clamp and the second rotatable clamp; the first rotatable clamp and the second rotatable clamp are loosened, and the singlemode fiber section between two laser exposure points forms a twisted fiber section. The invention provides an intensity modulation type optical fiber twisting sensor and a testing device thereof. Theintensity modulation type optical fiber twisting sensor has the advantages of achieving single-wavelength intensity modulation, identifiable twisting direction, large measurement range, high responsespeed, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a preparation method of a twisted optical fiber segment, an intensity modulation optical fiber twist sensor with identifiable twisting direction and a testing device thereof. Background technique [0002] Fiber optic twist sensors have attracted the interest of many researchers, mainly to monitor the degradation of some infrastructure in many smart engineering applications. At present, there are mainly two methods of optical fiber twist sensor: wavelength measurement and intensity measurement. Fiber twist sensors based on wavelength measurement mainly include specially designed fiber gratings, Sagnac interferometers based on birefringent fibers, and fiber devices with helical structures. Among them, most optical fiber twist sensors based on wavelength measurement can identify the direction of its twist, but wavelength measurement requires the use of a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 尹国路付秦江梁传灿朱涛
Owner 成都塔科光电技术有限公司