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Detection system and method for geometric parameters of damaged optical fiber

A technology of geometric parameters and detection system, applied in the field of detection, can solve problems such as defects

Inactive Publication Date: 2016-02-24
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the optical fiber is damaged or deformed, defects will appear in the traditional method.

Method used

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  • Detection system and method for geometric parameters of damaged optical fiber
  • Detection system and method for geometric parameters of damaged optical fiber
  • Detection system and method for geometric parameters of damaged optical fiber

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Embodiment 1

[0059] See figure 1 The present invention discloses a detection system for the geometric parameters of damaged optical fibers. The system includes: an image reading unit 1, a threshold selection unit 2, an image binarization processing unit 3, an edge point selection unit 4, an ellipse fitting and Parameter acquisition unit 5.

[0060] The image reading unit 1 is used for reading fiber images.

[0061] The threshold value selection unit 2 is used to count the gray histogram and select the best threshold value. Specifically, the threshold selected by the threshold selection unit is the gray value of the trough between the first peak and the second peak; wherein the gray value of the first peak is V1, and the gray value of the second peak is V2 ; The threshold value is a gray value in the gray value V1 and V2 interval, and the number of pixels of the gray value is not more than the number of pixels of other gray values ​​in the interval. Assuming that the selected threshold value ...

Embodiment 2

[0096] The detection method and system of the present invention are divided into two parts. The first part: the acquisition and expression of image geometric parameters; the second part: the workflow of the detection system.

[0097] 【1】Acquisition and expression of image geometric parameters

[0098] This article proposes a method that can detect damaged fibers. The key is the accuracy of the fitting parameters, which is related to how to accurately pick points. Figure 5 It is a picture of the optical fiber collected in an actual application environment. The picture is obviously defective. Next, the image is processed by the method of the present invention.

[0099] The specific expression is as follows:

[0100] ①Statistical gray histogram, select binarization threshold:

[0101] The selected threshold should be a gray value (valley) between the first wave peak (gray value V1) and the second wave peak (gray value V2), the threshold value is in the gray value V1 and V2 interval A gr...

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Abstract

The invention discloses a detection system and a detection method aiming at damaged optical fiber geometry parameters. The detection method comprises the following steps: reading an optical fiber image; threshold value selection step: statistically calculating a grey level histogram and selecting an optimal threshold value; image binarization step: carrying out binarization on the image; edge point selection step: accurately selecting an outer edge point and an inner edge point in the binary image; ellipse fitting and parameter obtaining step: obtaining parameters of an ellipse of an outer edge through the selected outer edge point and fitting parameters of an ellipse of an inner edge through the inner edge point; and obtaining the geometry parameters of an optical fiber picture after the ellipses of the inner edge and the outer edge are fitted. The detection system and the detection method aiming at the damaged optical fiber geometry parameters disclosed by the invention have the beneficial effects that by using a novel method for extracting a coordinate point, the points which are not on the ellipses can be rejected; and further, the ellipse fitting precision is improved.

Description

Technical field [0001] The invention belongs to the technical field of detection, and relates to a detection system, in particular to a detection system for the geometric parameters of the damaged optical fiber; meanwhile, the invention also relates to a detection method for the geometric parameter of the damaged optical fiber. Background technique [0002] Generally, the cladding and core diameter of a qualified fiber can be considered as an ellipse with two centers at the same point and close to a circle. The traditional method of detection can accurately detect the geometric parameters of the qualified fiber. But when the optical fiber is damaged or deformed to a certain extent, defects will appear in the traditional method. [0003] In view of this, there is an urgent need to design a new detection method to further improve the accuracy of ellipse fitting. Summary of the invention [0004] The technical problem to be solved by the present invention is to provide a detection sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00G01B11/08G01B11/24G01B11/27
Inventor 黄影平张仁杰龚如宾
Owner UNIV OF SHANGHAI FOR SCI & TECH