Automated analysis of thermally-sensitive coating and method therefor
AssigneeRaytheon Technologies Corporation
InventorsAlan Matthew Finn, Serge L. Shishkin, Ziyou Xiong, Thomas J. Martin, Scott A. Liljenberg
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Abstract
A method for thermally-sensitive coating analysis of a component includes imaging the coated, exposed component over a range of distinct frequencies as selected by a narrowband variable filter; estimating parameters of non-uniformity correction (NUC) for every pixel at every wavelength; constructing a 2D temperature map on a pixel-by-pixel basis using the non-uniformity correction; and mapping the 2D temperature map to a 3D computer aided design (CAD) model.
Claims20
A method for non-destructive thermally-sensitive coating analysis of a component under inspection, the method comprising:
- performing one or more scans of a thermally-sensitive coated and thermally exposed component to generate image data via a multispectral camera displaced from the component;
- estimating parameters of non-uniformity correction (NUC) for one or more pixels of one or more dark field images and one or more corresponding pixels of one or more bright field images;
- constructing a 2D temperature map for one or more pixels of the scanned image using the parameters from the non-uniformity correction;
- and
- mapping the 2D temperature map to a 3D computer aided design (CAD) model of the component using image analytics in which repeated scans continue automatically until one or more of a convergence and a fixed number of iterations is reached, wherein the repeated scans comprise one or more repeated scans of a dark field image, a bright field image, a test coupon, and the component, the mapping of each of the repeated scans comprises:
- finding a correspondence between a feature of the 2D temperature map and a feature of the 3D model;
- recovering extrinsic parameters via optimization using the correspondence;
- transforming the 2D temperature map to derive positioning and orientation;
- and
- projecting the 2D temperature map with respect to the extrinsic parameters.
A non-destructive thermally-sensitive coating analysis system comprising:
- a multispectral camera;
- one or more of a narrowband multispectral filter, a polarization filter, an incident angle variation for the multispectral camera displaced from the component under inspection;
- and
- a control system operable to map a 2D temperature map from the multispectral camera to a 3D CAD model of the component using image analytics in which repeated scans by the multispectral camera are filtered, wherein the repeated scans continue automatically until one or more of a convergence and a fixed number of iterations is reached, the repeated scans comprise one or more repeated scans of a dark field image, a bright field image, a test coupon, and the component.
Dependencies are inferred from the claim text.