Defect width calibration standardizing system and method in optical surface defect dark field detection
A technology for optical surface and dark field detection, which is applied in the direction of optical testing for flaws/defects, etc. It can solve the problems of difficult and large-diameter component detection, slow detection time, and inability to accurately calibrate defects, etc., to achieve large detection range and high The effect of detection speed
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[0035] The schematic diagram of the standardization system for defect width calibration in the dark field detection of optical surface defects is as follows figure 1 shown. Use a ring-illuminated LED light source to illuminate the calibration plate on the working platform, use a high-resolution CCD with a resolution of 2048×2048, and observe and image the calibration plate through a 1X-16X continuous zoom microscope, forming a microscope dark field imaging. The working platform on which the quartz calibration plate is located is moved by a one-dimensional guide rail with an accuracy of 1 μm controlled by a computer, so as to realize the scanning of the sub-aperture of the calibration plate.
[0036] According to the above steps, first make a quartz calibration plate engraved with a series of standard patterns. Sampling the finished quartz calibration plate, select a set of calibration lines on a calibration plate, and use scanning electron microscope to mea...
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