METHOD AND TESTING DEVICE FOR OPTICAL SURFACE TESTING Russian patent published in 2024 - IPC G01N21/88 

FIELD: optics.

SUBSTANCE: methods for optical inspection of the object surface. According to the method, a time-periodic pattern with different lighting patterns is generated on the surface by a lighting device of the control device during an image recording sequence, and in the image registration sequence, multiple images of the circuit are recorded on the surface using the image recording device of the control device. The generation of one of the different lighting patterns is respectively synchronized with the registration of one of the images of the circuit so that each image from the image registration sequence is respectively registered with a known lighting pattern from the different lighting patterns. The phase of the pattern is determined from a continuous series of recorded known lighting patterns in at least one point in the image. Defects on the surface are detected by deviations in the lighting pattern recorded in at least one image from the generated lighting pattern. The lighting device and image recording device are positioned at a reflection angle a, while during surface control the object is moved relative to the control device. The duration of the image registration sequence is chosen in such a way that the reflection zone of the sequence, which is defined as the surface area covered in aggregate by the reflection zones in the corresponding images from the image registration sequence, is considered constant.

EFFECT: improving the reliability of monitoring moving surfaces.

12 cl, 18 dwg