Interpretation of Impact Echo time signals to avoid bias through geometry effects
Publication date
2025-10-01
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
International Symposium on Non-Destructive Testing in Civil Engineering (NDT-CE 2025) ; Izmir, Turkey ; September 24–26, 2025
Publisher
NDT Internet Publishing
Series or journal
E-Journal of Nondestructive Testing (eJNDT)
ISSN
Periodical volume
30
Periodical issue
10
Part of the university bibliography
✅
Language
English
Keyword
dtec.bw
Abstract
The interpretation of Impact Echo signals has mostly been conducted in the frequency domain in the past. Due to
its implementation as a scanning technique, so-called B-scans are generated for interpretation. However, as the
method aims at the measurement of resonance frequencies, B-scans in the time domain are often neglected during
interpretations. This study uses insights gained from numerical simulations to shed light on Impact Echo time
signals in cases where geometry effects are present in the data. The focus is on noise reduction through new
processing approaches, repeated measurements, and arrays. It was found that moving average filters are effective
for removing reflection signals coming from the side walls. Furthermore, it is beneficial to focus on evaluating the
start of Impact Echo time signals as the signal-to-noise ratio decreases over time.
its implementation as a scanning technique, so-called B-scans are generated for interpretation. However, as the
method aims at the measurement of resonance frequencies, B-scans in the time domain are often neglected during
interpretations. This study uses insights gained from numerical simulations to shed light on Impact Echo time
signals in cases where geometry effects are present in the data. The focus is on noise reduction through new
processing approaches, repeated measurements, and arrays. It was found that moving average filters are effective
for removing reflection signals coming from the side walls. Furthermore, it is beneficial to focus on evaluating the
start of Impact Echo time signals as the signal-to-noise ratio decreases over time.
Description
Published by NDT.net under License CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/)
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Published version
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