NDLI: Ultrasonic echo technique applied to wood

Content Provider	Springer Nature Link
Author	Hasenstab, A. Krause, M. Hillemeier, B. Rieck, C.
Copyright Year	2006
Abstract	In der Praxis kann Fäulnis in Holzkonstruktionen ein großes Problem darstellen. Ein Fäulnisbefall kann zu einer Schädigung in der Gesamtkonstruktion führen. Zusammen mit der TU Berlin wurden an der Bundesanstalt für Materialforschung und -prüfung (BAM) Versuche mit Ultraschallecho zur Detektion von Bauteilrückwänden und verdeckten Hohlstellen durchgeführt. Hierbei werden Sender und Empfänger auf einer Bauteilseite angekoppelt, was eine große Anwendungsvielfalt ermöglicht. Im Rahmen der Versuche an der BAM wurden zylindrische Longitudinalwellenprüfköpfe in Zweikopftechnik mit 100 kHz angeregt und an den Probekörpern mit verschiedenen Koppelmitteln angekoppelt. Die Messergebnisse wurden graphisch als B-Bilder dargestellt und ausgewertet. Dabei zeigte sich, dass die Rückwand der fehlerfreien Probekörper klar geortet wird und eingebrachte Hohlstellen besonders gut detektiert werden können. In practice, decay may present a big problem for timber constructions. Decay can lead to major damage of the whole construction. Tests were made by the Federal Institution for Materials Research and Testing (BAM) and the Technical University of Berlin to detect back walls and covered cavities using ultrasonic echo technique where transmitter and receiver are coupled to the same surface of the specimen. Thus a large variety of applications is possible. Two cylindrical longitudinal wave transducers were used in pulse echo technique and coupled with various coupling media. The ultrasonic centre frequency for pulse excitation was optimised to 100 kHz. Results were represented and evaluated as B-scans. In conclusion, the back walls of specimen without defects can be clearly recognized and cavities could be detected very well.
Starting Page	475
Ending Page	481
Page Count	7
File Format	PDF
ISSN	00183768
Journal	Holz als Roh- und Werkstoff
Volume Number	64
Issue Number	6
e-ISSN	1436736X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-08-26
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Operating Procedures, Materials Treatment Ceramics, Glass, Composites, Natural Methods Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Materials Science Forestry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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