Mr. Zhenyong Huang Profile

Zhenyong Huang

at Beijing Institute of Technology

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Proceedings Article | 15 November 2022 Paper

Observing the contour defects of microspheres with laser diffraction method and MATLAB simulation

Zhenyong Huang, Junwen Xue, Jialin Tang, Chunlong MA, Binghua SU

Proceedings Volume 12448, 124480D (2022) https://doi.org/10.1117/12.2631962

KEYWORDS: Diffraction, Optical simulations, MATLAB, Laser processing, Defect detection, Fourier transforms

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If the contour of the pen-head sphere is defective,ink leakage may occur.The common size of pen-head sphere is 0.5 or 0.7 mm,and the contour defects of microsphere with millimeter level are difficult to detect by conventional methods.This paper investigates an observation scheme of the contour defects using laser diffraction: The microhole surrounded by three tangent spheres are scanned with laser spots,consider the microhole pattern as the aperture pattern,obtaining the diffraction pattern by machine vision,calculating the angles of the three light rays through the data processing program to determine the difference between the microsphere radii of the measured and the standard microsphere,and calculate the fluctuation amplitude of the level 0 and 1 bright stripes to determine the presence of convex or concave defects.This paper simulates the diffraction patterns of qualified and two adverse products using MATLAB software.The diffraction patterns of the round hole,square hole,and regular triangle hole outputted by the MATLAB program are consistent with the existing research results,confirming the correctness of the MATLAB program.The present protocol enables a scan to detect contour defects of three microspheres at the same time,greatly improving detection efficiency.

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