Ming-li DONG, Bo LI, Fan ZHANG, et al. Detection of periodic microstructure defect based on optical Fourier transform[J]. Optics and precision engineering, 2017, 25(7): 1727-1737.
DOI:
Ming-li DONG, Bo LI, Fan ZHANG, et al. Detection of periodic microstructure defect based on optical Fourier transform[J]. Optics and precision engineering, 2017, 25(7): 1727-1737. DOI: 10.3788/OPE.20172507.1727.
Detection of periodic microstructure defect based on optical Fourier transform
In order to achieve defect detection of periodic microstructure in a large field of view
a defect detection method based on optical Fourier transform was proposed and relevant experimental system was established. Firstly
the periodic microstructure imaging was subject to two-dimensional fast Fourier transform for deriving spatial frequency spectrum of periodic microstructure. Then
a spot among first-order diffraction spots was chosen to be processed by fast Fourier transform for obtaining the amplitude histogram. According to the mutation location in the amplitude histogram
defect positions were determined. The deviation of defects was proportional to the intensity of the amplitude mutations. The experimental result shows that the system can provide a measurement field of view of 1.5 mm×1.5 mm and the measurement resolution over 0.5 μm
improving the detection field greatly on the premise of an adequate resolution. The proposed method enables fast
efficient and convenient defect detection of periodic microstructure in a large field of view.
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references
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