Opposite phased transducer — novel type of transducer

Jorma Pitkänen, V. Kniazev, Pentti Kauppinen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Defect sizing is an important task giving input to fracture mechanics evaluation. The exact evaluation of sound field is the key factor to analyse precisely defects in materials. Sizing accuracy is affected by the size of the sound field. There are several methods available for sizing: SAFT, Acoustic Holography, Tip diffraction, Amplitude drop. In SAFT and acoustic holography applications the sound field is calculated according to the back propagation of sound waves from an object (defect, flaw). The echoes are calculated according to their origin. In tip diffraction technique the external sides of defect are determined based on direct echoes coming from the crack tips. Amplitude drop technique is affected by the sound field size to defect size ratio. Opposite phased transducer is based on sound field determination in design phase. The sound field is calculated using an ultrasonic modelling software and the sound field is very narrow also for a long sound path distance. This feature is used when sizing by using opposite phased transducer.
Original languageEnglish
Title of host publicationQuantitative Nondestructive Evaluation
PublisherAmerican Institute of Physics (AIP)
ISBN (Print)978-0-7354-0173-0
Publication statusPublished - 2004
MoE publication typeA4 Article in a conference publication
EventReview of Progress in Quantitative Nondestructive Evaluation Conference, QNDE - Green Bay, United States
Duration: 27 Jul 20031 Aug 2003

Publication series

SeriesAIP Conference Proceedings


ConferenceReview of Progress in Quantitative Nondestructive Evaluation Conference, QNDE
Country/TerritoryUnited States
CityGreen Bay


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