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Pipeline inner surface detection system based on circular structured light vision sensor

A vision sensor, circular structured light technology, applied in the direction of optical testing flaws/defects, etc., can solve the problems of complex structure, inability to achieve accurate 3D measurement, information overlap, etc.

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 2) The halo section method is relatively simple, but information overlap will occur between adjacent rings, and accurate three-dimensional measurement cannot be realized
[0014] 3) PSD detection can realize accurate three-dimensional measurement, but it needs scanning device, complex structure and low measurement efficiency

Method used

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  • Pipeline inner surface detection system based on circular structured light vision sensor
  • Pipeline inner surface detection system based on circular structured light vision sensor
  • Pipeline inner surface detection system based on circular structured light vision sensor

Examples

Experimental program
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Embodiment Construction

[0054] The experimental process of using the measurement system to measure the inner surface of the pipeline is as follows:

[0055] (1) Put the sliding seat on the one-dimensional guide rail, and connect the pipe support through the rod, then place the pipe on the support along the direction of the one-dimensional guide rail, fix the CCD camera on the support, and pass through the inner surface of the pipe , determine the axial distance between the CCD camera and the circular structured light projector according to the inner diameter of the pipe, and ensure that the optical center of the camera is aligned axially with the center of the conical surface, such as image 3 Show;

[0056] (2) Put the target between the camera and the circular structured light projector, turn on the circular structured light projector, then the circular structured light surface is projected onto the target plane, and a circular light bar is obtained, move the plane target along the direction of th...

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Abstract

The invention discloses a pipeline inner surface detection system based on a circular structured light vision sensor, and belongs to the field of nondestructive measurement. The system comprises a circular structured light projector and a camera which are arranged in a pipeline, wherein the camera is externally connected with an image acquisition card and connected to a computer through cables. The system is characterized in that: the camera and the circular structured light projector are arranged along the axial direction of the pipeline, and the optical center of the camera is aligned with the central axial direction of a conical curved surface; and the axial direction between the camera and the structured light projector is greater than l, and l is more than r / 2 / tanA, wherein r is the inside diameter of the pipeline, and A is a divergent half cone angle of the structured light projector, so that projected circular structured light bars can be shot by the camera. By utilizing axial placement of the camera and a laser, the volume of the vision sensor is effectively reduced, and three-dimensional measurement on a limited space in the pipeline is realized. Three-dimensional information of the whole sections of the pipeline can be acquired by measuring each pipeline section once, the complexity of a single-point measuring and scanning device is avoided, and the measurement speed is improved.

Description

technical field [0001] A pipeline inner surface detection system based on a circular structured light vision sensor belongs to the technical field of non-destructive testing. Background technique [0002] As the main means of gas and liquid transmission, pipelines are widely used in various fields of modern industry. Since most of the gases or liquids transported by the pipeline are flammable, explosive, and highly corrosive, it is necessary to conduct three-dimensional inspections on the inner surface of the pipeline regularly to ensure the safe operation of the pipeline. At present, the inner surface inspection technologies of pipelines mainly include non-destructive testing technologies such as magnetic flux leakage technology, eddy current testing technology, ultrasonic testing technology and video testing. [0003] (1) Flux leakage detection technology [0004] The magnetic flux leakage detection technology needs to magnetize the pipeline under test, use the magnetic ...

Claims

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Application Information

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IPC IPC(8): G01N21/88
Inventor 王颖张瑞赵利强于涛
Owner BEIJING UNIV OF CHEM TECH
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