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Spectral Distance Amplitude Control for Ultrasonic Inspection of Composite Components

Hillger, Wolfgang and Pfeiffer, Uwe (2006) Spectral Distance Amplitude Control for Ultrasonic Inspection of Composite Components. Proceeedings BB 103-CD. ISBN 3-931381-86-2.

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Abstract

Ultrasonic inspection of sound-attenuating material like Fibre Composites requires correction for the loss of echo amplitude. Conventional Distance Amplitude Control (DAC) is not always sufficient, because it does not count for the spectral shift towards low frequencies after long sound paths. Therefore the detection of small flaws is limited, because they require high frequency ultrasonic signal. Consequently, small and deep defects are underestimated in conventional ultrasonic testing. In this paper, a method called SDAC (“spectral distance amplitude correction”) is presented. SDAC is based on digital signal processing algorithms and consists of a signal analysis module and a signal processing module. Analysis provides the typical sound attenuation characteristics of a specific material. Based on these characteristics, the compensation algorithm in the signal processing module recovers the lost spectral signal components in each A-scan. Processed A-scans look like if there was no sound attenuation. Then flaw echoes can be directly compared with each other, widely independent of the flaw’s depth and size.

Document Type:Proceedings
Title:Spectral Distance Amplitude Control for Ultrasonic Inspection of Composite Components
Authors:
AuthorsInstitution or Email of Authors
Hillger, WolfgangUNSPECIFIED
Pfeiffer, UweUNSPECIFIED
Date:2006
Series Name:Proceeedings BB 103-CD
ISBN:3-931381-86-2
Status:Published
Keywords:Ultrasonic Testing (UT), DAC, Signal Processing, Composite, carbon fiber reinforced plastic (CFRP)
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Wolfgang Hillger
Deposited On:24 Jan 2012 07:52
Last Modified:24 Jan 2012 07:52

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