Patent ID: 9137462
Filing Date: 2015-09-15
Classification: G01N,G06T,H04N

Abstract:
1. A method to measure a width of a gap between two moving parts in a machine, comprising: recording an image of the gap with an infra-red camera and storing the image as image data, wherein the gap is between two adjacent blades in a rotating turbine rotor of a gas turbine; a processor extracting a first and a second edge related to the gap from the image data; the processor applying a Hough transform to a plurality of pixels of the first edge to determine a first line and to a plurality of pixels of the second edge to determine a second line, substantially parallel to the first line and applying voting related to the plurality of pixels of the first edge to select line parameters of pixels in a majority; the processor applying a line through at least one pre-defined point that crosses the first and second lines; the processor determining the width of the gap from a length of the line through the at least one pre-defined point that crosses the first and second lines; and determining a performance of the gas turbine based on the width of the gap.