A Spring Pitch Measurement Method Based on Fourier Transform

A technology of Fourier transform and measurement method, which is applied in the field of measurement, can solve the problems of large error and low efficiency, and achieve the effect of fast, efficient and accurate measurement

Active Publication Date: 2020-04-07
温州大学苍南研究院
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Problems solved by technology

[0002] At present, most manufacturers still use tools such as vernier calipers to measure the spring pitch manually. This kind of traditional measurement method is not only inefficient but also has large errors.

Method used

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  • A Spring Pitch Measurement Method Based on Fourier Transform
  • A Spring Pitch Measurement Method Based on Fourier Transform
  • A Spring Pitch Measurement Method Based on Fourier Transform

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Embodiment Construction

[0027] In order to make the technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] refer to Figure 1-Figure 6 , the present invention provides a method for measuring spring pitch based on Fourier transform,

[0029] Include the following steps:

[0030] S1: Use a line laser to irradiate along the axial direction of the spring, and use an industrial camera to photograph the irradiated area, and convert the obtained true-color image into a grayscale image, such as figure 1 shown;

[0031] S2: According to the laser irradiation angle, the part of the line laser illuminated in the irradiation area is extracted, and the rest is set to zero, such as figure 2 As shown, above the center line, the ...

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Abstract

The invention discloses a Fourier conversion-based spring pitch measurement method. The Fourier conversion-based spring pitch measurement method comprises the following steps of 1, irradiating along an axial direction of a spring by laser, shooting an irradiation image by an industrial camera, and converting the obtained image to a gray scale image; 2, extracting a part illuminated by the laser inan illumination region; 3, detecting and extracting points with maximum intersections under a parameter coordinate system by Hough transformation; 4, converting an expression obtained in the step 3 to a straight-angle coordinate system; 5, sampling in an image coordinate system according to a linear expression; 6, performing interpolation processing on a sampling point; 7, performing Fourier conversion on an interpolation straight line, and extracting maximum energy position in a Fourier frequency spectrum; and 8, calculating an entropy. The Fourier conversion-based spring pitch measurement method has the beneficial effects that the average pitch size is calculated by Fourier conversion, and rapid, high-efficiency and accurate measurement of spring pitch is achieved; and moreover, the entropy can be calculated according to the Fourier frequency spectrum, so that the pitch stability of the spring is evaluated.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a method for measuring spring pitch based on Fourier transform. Background technique [0002] At present, most manufacturers still use tools such as vernier calipers to measure the spring pitch manually. This kind of traditional measurement method is not only inefficient but also has large errors. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a spring pitch measurement method with high measurement efficiency and high accuracy. [0004] In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions: a method for measuring spring pitch based on Fourier transform, comprising the following steps: [0005] Step 1, use a line laser to irradiate along the axial direction of the spring, and use an industrial camera to photograph the irradiated area,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 孙维方向家伟周余庆钟永腾
Owner 温州大学苍南研究院
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