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

Abstract

The invention relates to a film-coated product detection system and detection method based on optical coherence tomography, and relates to the field of appearance defect detection, wherein the detection method includes the following steps: S1, detection of placing the film-coated product on a conveying mechanism at a feeding station On the platform; S2, the driving device of the conveying mechanism drives the detection platform to bring the coated product into the detection station; S3, the optical coherence tomography imaging device performs tomographic scanning on the coated product; S4, the image processing algorithm module receives the 3D analysis image Finally, the 3D analysis image is processed, and then the defects are identified and classified, and the detection results are output; S5, the conveying mechanism carries the inspected coated products into the sorting station; S6, sorting and categorizing. The invention can carry out automatic detection on film-coated products, and especially can carry out spatial identification on defects, so as to accurately identify whether the film is defective, the substrate to be tested is defective, or there are defects such as attachments between the two.

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

Images