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The most common way of producing optical phase conjugation is to use a four-wave mixing technique, though it is also possible to use processes such as stimulated Brillouin scattering. A device producing the phase-conjugation effect is known as a phase-conjugate mirror (PCM).
Method for classifying linear polarization defects in transparent materials using stress birefringence
ActiveCN121499397BMaterial analysis by optical meansCharacter and pattern recognitionFeature vectorMacroscopic scale
The application discloses a transparent material stress birefringence online polarization defect classification method and relates to the field of transparent material optical detection. The method comprises the following steps: collecting an original polarization image of a to-be-detected transparent material, pre-processing the original polarization image, and generating a calibrated polarization image; canceling vibration noise in the light path of the calibrated polarization image based on an optical phase conjugation technology to obtain a pure polarization light field signal; calculating a retardation distribution diagram of the transparent material according to the pure polarization light field signal, performing topological data analysis on the retardation distribution diagram, and extracting a macroscopic topological feature vector; and dividing the macroscopic topological feature vector into macroscopic layout features reflecting the overall topological structure of a stress field and microscopic morphological features reflecting the local geometric morphology of a defect according to feature sources and physical meanings. The application realizes high-precision defect classification and effectively solves the problem of low classification precision caused by large vibration interference and insufficient feature representation in online detection.
Owner:NAT INST OF MEASUREMENT & TESTING TECH