Composite inspection

COMPOSITE INSPECTION A method of detecting local material changes (246) in a composite structure (202) is presented. A pulsed laser beam (220) is directed towards the composite structure (202) comprised of a number of composite materials (203). Wide-band ultrasonic signals (226) are formed in the co...

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Main Authors MOTZER, William P, GEORGESON, Gary Ernest, BRADY, Steven Kenneth, O'DONNELL, Matthew, STEWART, Alan F, PELIVANOV, Ivan, BINGHAM, Jill Paisley, KENNEDY, James C, KOLLGAARD, Jeffrey Reyner
Format Patent
LanguageEnglish
Published 13.05.2021
Subjects
COLORIMETRY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PHYSICS
RADIATION PYROMETRY
TESTING
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Summary:COMPOSITE INSPECTION A method of detecting local material changes (246) in a composite structure (202) is presented. A pulsed laser beam (220) is directed towards the composite structure (202) comprised of a number of composite materials (203). Wide-band ultrasonic signals (226) are formed in the composite structure (202) when radiation of the pulsed laser beam (220) is absorbed by the composite structure (202). The wide-band ultrasonic signals (226) are detected to form data (240). The data (240) is processed to identify a local frequency value (272) for the composite structure (202). The local frequency value (272) is used to determine if local material changes (246) are present in the number of composite materials (203). (START) DIRECT A PULSED LASER BEAM TOWARDS A COMPOSITE STRUCTURE COMPRISED OF A PLURALITY OF LAYERS, WHEREIN 1002 A NUMBER OF WIDE-BAND ULTRASONIC SIGNALS ARE FORMED IN THE COMPOSITE STRUCTURE WHEN RADIATION OF THE PULSED LASER BEAM IS ABSORBED BY THE COMPOSITE STRUCTURE DETECT THE WIDE-BAND ULTRASONIC SIGNALS TO FORM DATA, 1004 WHEREIN THE DATA COMPRISES A PLURALITY OF ULTRASONIC A-SCANS FOR AT LEAST A PORTION OF THE COMPOSITE STRUCTURE 1006 APPLY A MOVING WINDOW IN THE TIME DOMAIN TO EACH OF THE PLURALITY OF A-SCANS TO FORM WINDOWED SIGNALS DETERMINE A FREQUENCY MEASUREMENT WITHIN THE 1008 WINDOWED SIGNALS FOR EACH OF THE PLURALITY OF A-SCANS AVERAGE THE FREQUENCY MEASUREMENT FOR 1010/ ALL OF THE PLURALITY OF A-SCANS TO FORM A FREQUENCY VALUE FOR THE COMPOSITE STRUCTURE DETERMINE IF THE COMPOSITE STRUCTURE HAS A MODIFIED 1012-/ STRUCTURAL PERIOD USING THE FREQUENCY VALUE
Bibliography:Application Number: AU20160244198