Fill tube bore inspection with machine vision
A semi-automated technique for bore inspection of small diameter tubes is presented. The inspections are performed to insure that the bore surfaces are free of contaminants or defects. The image collectionscheme uses a borescope which is stepped along the length of the tube. An image is acquired at each step and portions from each image are combined to yield a planar image. Color analysis classifies the oxidation levels in the bore of the fill tubes. The analysis is performed by taking the image's mean values of the red, green, and blue intensities and computing a figure of merit which is then used to estimate the relative amount of oxidation. This estimation scheme was shown to have a high level of correlation with the tube oxidation levels and the quality of the subsequent welds as determined by metallographic evaluation.Surface imperfections are detected by a series of digital filtering steps followed by a statistical analysis of the resulting binary image. The frequency parameter of the Poisson distribution for the total image and image segments are computed. A statistical significance test is performed by comparing the frequency parameter of each segment to the global statistics of the image. Fine longitudinal scratches were detected with this method.
- Research Organization:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 6739067
- Report Number(s):
- WSRC-MS-92-233; CONF-930163-1; ON: DE93005515
- Resource Relation:
- Conference: IS T/SPIE symposium on electronic imaging science and technology, San Jose, CA (United States), 31 Jan - 5 Feb 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOREHOLES
INSPECTION
STAINLESS STEEL-304
MECHANICAL PROPERTIES
OXIDATION
AUGER ELECTRON SPECTROSCOPY
METALLURGY
PIPES
POISSON EQUATION
WELDED JOINTS
ALLOYS
AUSTENITIC STEELS
CAVITIES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
DIFFERENTIAL EQUATIONS
ELECTRON SPECTROSCOPY
EQUATIONS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS
NICKEL ALLOYS
PARTIAL DIFFERENTIAL EQUATIONS
SPECTROSCOPY
STAINLESS STEELS
STEEL-CR19NI10
STEELS
360105* - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties