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A high-precision non-contact pipe diameter measurement method and device

A non-contact, pipe diameter measurement technology, used in measurement devices, optical devices, instruments, etc., can solve problems such as low accuracy and difficulty in real-time online measurement

Active Publication Date: 2020-10-09
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical problems of low precision of the existing measurement methods and difficulty in real-time online measurement, the present invention provides a high-precision non-contact pipe diameter measurement method based on the digital speckle correlation calculation method. In the direction, a first baffle and a second baffle having a similar projected boundary to the tested pipe are arranged, and the first baffle and the second baffle are respectively arranged on both sides of the tested pipe, and the measured pipe axis The center line, the first baffle, and the second baffle are coplanar, and are characterized in that:

Method used

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  • A high-precision non-contact pipe diameter measurement method and device
  • A high-precision non-contact pipe diameter measurement method and device
  • A high-precision non-contact pipe diameter measurement method and device

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Embodiment 1

[0027] The present invention will be further described in conjunction with accompanying drawing now: a kind of high-precision non-contact pipe diameter measurement method, such as figure 1 As shown, in the radial direction of the cross-section of the pipe to be tested, a baffle 2 having a similar projected boundary to the pipe to be tested is set, and the first baffle and the second baffle are respectively arranged on both sides of the pipe to be tested, so The axis line of the measured pipe, the first baffle plate and the second baffle plate are coplanar, and it is characterized in that:

[0028] 1) Use the parallel light collimation system 1 to project the measured pipe, the first baffle, and the second baffle in a vertical direction, and the projection is imaged on the image screen 4,

[0029] 2) Use the CCD image acquisition system 6 to collect the digital grayscale images of the measured pipe material, the first baffle plate, and the second baffle plate projected on the i...

Embodiment 2

[0037] A device for high-precision non-contact pipe diameter measurement, such as Figure 6As shown, it is composed of a parallel light collimation system 1, an image screen 4, and a CCD image acquisition system 6. It is characterized in that: the optical axis of the parallel light emitted by the parallel light collimation system is in the horizontal direction. A pair of V-shaped brackets 8 are also arranged on the horizontal direction of the vertical optical axis between them; the line connecting the bottom of the V-shaped groove on the pair of V-shaped brackets is horizontal and perpendicular to the optical axis; the pair of V-shaped brackets is also provided with There are two standard cylindrical baffles 2 parallel to the bottom line of the V-shaped groove, and the two standard cylinders are respectively fixed directly above and directly below the pair of V-shaped brackets; the parallel light emitted by the parallel light collimation system is vertical Incident to the two ...

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Abstract

The invention discloses a high-precision contactless pipe diameter measuring method and device and belongs to the field of digital image processing. The device is composed of a collimation light source, an image screen, a CCD image collection system and a computer. A tested round pipe is projected on the image screen through utilization of a collimation light. Projection of the pipe on the image screen is collected through utilization of the CCD image collection system. Vertical differential processing is carried out on digital images. Gray scale change boundaries of the images are found out.Different from other computer vision dimension measurement, the method and the device have the advantages that upper and lower fixed distance boundaries are set, the fixed upper boundary and a lower boundary of the tested pipe have similar projection bray scale images, the fixed lower boundary and the upper boundary of the pipe have the similar projection bray scale images, and digital speckle related operation is carried out on the fixed boundaries and the boundary of the pipe through utilization of a digital speckle related algorithm, so subpixel magnitude measurement of distance is realized. The method and the device are particularly applicable to rapid and high-precision detection of a pipe diameter on a production line. In a measurement process, stress does not need to be applied to the pipe. The method and the device are also applicable to measurement of a flexible material pipe diameter.

Description

technical field [0001] The invention relates to a method and device for non-contact and high-precision measurement of pipe diameters in industrial assembly lines, in particular to a method and device for automatic measurement of similar pipe diameters with high precision based on digital image processing technology. Background technique [0002] Pipes of various materials are widely used in daily production and life. The traditional high-precision detection method for pipe diameters is to use tools such as calipers or micrometers to measure manually. This kind of measurement depends on manpower, which is slow and labor-intensive. Low sampling rate and many other deficiencies. In addition, if the material of the pipe to be tested is easily deformed, the measurement error is often large by using a contact method such as a vernier caliper. [0003] The use of optical methods for measurement has the advantages of low cost, high speed, and non-contact. The image measurement acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/12G01B11/08
Inventor 吴幸智吴泉英徐越蔡达岭
Owner SUZHOU UNIV OF SCI & TECH