SD-OCT-based non-destructive detection method for conformal coating of PCB
By applying SD-OCT technology to perform non-destructive testing on PCB boards, the samples damage and accuracy limitation problems of the measurement of three-proof paint thickness in the prior art are solved, and high-precision and non-destructive three-proof paint thickness detection are achieved.
CN120147239APending Publication Date: 2025-06-13HUAIYIN INSTITUTE OF TECHNOLOGY
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Patent Information
- Application Number
- CN202510200015.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-06-13
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Figure CN120147239A_ABST
Abstract
A non-destructive detection method for PCB three-proofing paint based on SD-OCT is characterized in that a PCB three-proofing paint image acquired by frequency domain optical coherence tomography is analyzed, and accurate measurement of the thickness of the three-proofing paint is realized; comprising the steps that firstly, SD-OCT equipment is used for conducting scanning and image collection on a PCB coated with a three-proofing paint thin layer; secondly, performing Gaussian blur preprocessing operation according to the acquired image; and extracting the upper and lower boundaries of the conformal coating by using an edge detection algorithm to output boundary coordinates. And finally, calculating the corresponding height according to the coordinates in the output CSV file so as to obtain an average value. According to the method disclosed by the invention, the thickness of the conformal coating on the PCB can be accurately measured under the condition that the sample is not damaged.
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