Point Cloud Registration for Thin Coating Thickness Measurement
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Solution Overview
Problem
Traditional methods for measuring the thickness of surface coatings, especially those less than 100 micrometers, are inadequate and often unable to measure coatings on non-metallic surfaces effectively.
Innovation Solution
A computer-implemented method involving the registration of point clouds representing bare and coated surface portions relative to a common reference coordinate system, allowing for the calculation of coating thickness by comparing spatial attributes of data points from these clouds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional measurement methods are used, then measurement capability is available for standard applications, but measurement precision deteriorates for very thin surface coatings less than 100 micrometers
Solution Approach 1:
The patent replaces traditional mechanical contact measurement methods with optical scanning technology that uses light to capture surface geometry. The optical scanner projects light patterns and captures reflected light to create point cloud data, enabling non-contact measurement of thin coatings without mechanical interference or damage to the coating layer.
Solution Approach 2:
The patent creates digital copies (point clouds) of the coated and uncoated surfaces through optical scanning. These digital representations allow for precise virtual comparison and measurement of coating thickness without physically touching the coating, preserving the integrity of thin coating layers while enabling accurate measurement.
2Adaptability or versatility
If traditional measurement methods are used, then measurement process is simple, but adaptability deteriorates for non-metallic surfaces
Solution Approach 1:
The patent develops a universal measurement system based on optical scanning that can measure coatings on various materials including metal, plastic, composite, and other non-metallic surfaces. The system uses material-independent optical properties (light reflection) rather than material-specific properties, making it broadly applicable across different substrate types while maintaining measurement accuracy.
3Measurement precision
If point cloud registration method is implemented, then measurement precision improves for thin coatings, but device complexity increases due to multiple processing steps
Solution Approach 1:
The patent performs preliminary registration of the coated surface point cloud with the uncoated surface point cloud before measurement calculation. By pre-aligning the coordinate systems and establishing correspondence between points using reference features, the system simplifies the subsequent thickness calculation process and ensures accurate matching of corresponding surface locations.
Solution Approach 2:
The patent uses reference portions (uncoated areas) as intermediaries to establish the relationship between coated and uncoated surface coordinate systems. These reference areas serve as common ground for registration, allowing the system to accurately map corresponding points between the two surfaces and calculate coating thickness with high precision.
Data Source
AI summary
A computer implemented method may include the steps of: (1) providing a first point cloud representative of at least a bare portion of a surface of an object relative to a reference portion of the surface, (2) providing a second point cloud representative of at least a coated portion of the surface relative to the reference portion, (3) registering the first point cloud and the second point cloud with respect to a common reference coordinate system, (4) registering a first reference portion subset of the first data points representative of the reference portion and a second reference portion subset of the second data points representative of the reference portion, and (5) calculating difference values indicative of a thickness of the surface coating based on differences between a coated portion subset of the second data points and a bare portion subset of the first data points.