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Method for coating thickness measurement based on optical coherence tomography imaging technique and application thereof

A technology of optical coherence tomography and scanning imaging, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of human operation error, time-consuming and other problems, and achieve the effect of large-scale measurement

Inactive Publication Date: 2019-09-03
SUZHOU UNIV
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Problems solved by technology

This method can only be done on a spot check basis due to its destructive nature; it is also time consuming and subject to human error
In addition to the above disadvantages, the above non-destructive measurement and destructive measurement methods are only suitable for point measurement and not area measurement

Method used

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  • Method for coating thickness measurement based on optical coherence tomography imaging technique and application thereof
  • Method for coating thickness measurement based on optical coherence tomography imaging technique and application thereof
  • Method for coating thickness measurement based on optical coherence tomography imaging technique and application thereof

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] In the present invention, the thickness measurement of the conformal paint coating on the printed circuit board (Printed Circuit Board, PCB) is taken as an example for specific description. Such as Figure 5 As shown, the three anti-paint layers produced by Peters Company were sprayed on the printed circuit board selected in this embodiment, and the selected Figure 5 The rectangular frame area in (a) is scanned to obtain the corresponding Figure 5 (b) projection diagram, an...

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Abstract

The invention discloses a method for coating thickness measurement based on optical coherence tomography imaging technique and application thereof. The method comprises the steps of: constructing an optical coherence tomography imaging (OCT) test system; scanning a depth direction and a two-dimensional cross section of the surface of a sample material by using the OCT system and acquiring a three-dimensional scanning image of a measured object; and after denoising processing on the obtained three-dimensional scanning image, carrying out conversion to obtain binary image, carrying out segmentation to obtain an upper boundary and a lower boundary of a coating based on an edge tracking method, and calculating the thickness of the coating. With the disclosed method, the non-destructive automatic detection of the coating is realized; and the rapid, accurate, and wide-range measurement of the thickness of the coating can be realized. The method can be applied to measure the thicknesses of film coatings including tri-proof paint on the surface of a printed circuit board, a pigmented polymer coating, a porcelain protective coating, a plasma sprayed ceramic body, a biodegradable composite coating, a varnish coating, and a transparent or translucent tablet film coating.

Description

technical field [0001] The invention belongs to the detection field based on image analysis, and in particular relates to an optical coherence tomography-based imaging technique for measuring coating thickness and its application. Background technique [0002] Optical coherence tomography (OCT) is a low-coherence optical interference imaging technique. This technology measures the light signals scattered / reflected at different depths in the material by means of interference, thereby realizing three-dimensional imaging of the interior of the material. Based on its imaging mechanism, this technique is well suited for imaging and thickness measurement of multilayer structures. This imaging technique has the advantages of being non-destructive, fast and highly sensitive. OCT was originally invented for medical applications, and has successfully developed into a routine examination and diagnosis method for ophthalmic diseases. At the same time, OCT has shown great potential in...

Claims

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Application Information

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IPC IPC(8): G01B11/06
CPCG01B11/0675
Inventor 莫建华邵校陈新建
Owner SUZHOU UNIV
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