Film-coated product detection system and method based on optical coherence tomography

Abstract

The invention relates to a film-coated product detection system and method based on optical coherence tomography, and relates to the field of appearance defect detection. The detection method comprises the following steps: S1, placing a film-coated product on a detection platform of a conveying mechanism at a feeding station; S2, enabling a driving device of the conveying mechanism to drive the detection platform to carry the film-coated product to enter a detection station; S3, enabling the optical coherence tomography imaging device to carry out tomography on the film-coated product; S4, after the image processing algorithm module receives a 3D analysis image, processing the 3D analysis image, then carrying out defect identification and classification, and outputting a detection result; S5, enabling the conveying mechanism to drive the detected film-coated product to enter a sorting station; and S6, sorting and classifying. The film-coated product can be automatically detected, and especially the defects can be spatially identified, so that the defects that the film has defects, whether the detected substrate has defects, or whether attachments exist between the film and the detected substrate can be accurately identified.

Description

technical field [0001] The invention relates to the field of visual detection, in particular to a film-coated product detection system and detection method based on optical coherence tomography. Background technique [0002] The coating material is a composite material that is coated with a transparent or translucent film on the outside of the object. The film is used to protect the objects wrapped inside from being damaged by external scratches, or for insulation, chemical corrosion isolation, etc. Due to objective process reasons, the object under test cannot be inspected for defects before lamination, and it has high requirements for appearance quality. This requires a method and solution that can detect defects on coated items to ensure that the defects of the tested object itself can be detected, and at the same time, the defects and surface adherents of the coated film, as well as the coating and the tested object, will not be separated. Some tiny foreign impurities ...

AI Technical Summary

Problems solved by technology

However, because its optical mechanism is two-dimensional imaging, it is impossible to obtain information on the stacking direction of the coating and the measured object. Defects will be lumped together and all judged to be defects of the measured object, causing high quality misjudgment and overkill

[0004] 3D inspection can obtain the three-dimensional information of the object under test, and can realize three-dimensional size measurement or defect detection at different depth positions. There are many application examples in the industry at present.

However, whether it is binocular vision, 3D structured light, point or line laser or ToF technology, only the surface layer information of the measured object can be obtained, and layered detection cannot be achieved.

Ultrasonic technology can be used to detect internal defects of objects, but industrial applications are greatly limited due to the need to coat the surface of the measured object or soak the measured object in a coupling medium

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