Ultrasonic imaging of a turbine blade model using a 360° synthetic-aperture-focusing-technique and reverberation suppression

Scharrer T, Koch A, Rupitsch S, Sutor A, Ermert H, Lerch R (2013)

Publication Language: English

Publication Status: Published

Publication Type: Conference contribution, Conference Contribution

Publication year: 2013

Pages Range: 150-153

Article Number: 6724761

Conference Proceedings Title: 2013 IEEE International Ultrasonics Symposium Proceedings

Event location: Prague CZ

ISBN: 9781467356862

DOI: 10.1109/ULTSYM.2013.0039

Abstract

In this contribution, we present a method to complement missing X-ray computed tomography (CT) data of irregular shaped metallic specimen, like turbine blades, by ultrasonic testing in immersion mode. Therefore, an adapted 360° synthetic-aperture-focusing-technique (SAFT) is used to obtain particular information of the inner pattern of the specimen. These structural information cannot be imaged by X-ray CT due to limited penetration in specific directions and consequently absent projections in the dataset. However, arising artifacts caused by refraction and signal reverberation impede the detection of the desired structural information by ultrasonic testing of those irregular metallic specimens. To cope with refraction effects caused by the immense discrepancies in speed of sound (SOS) at the interface of the couplant and the specimen, the approach is based on virtual source elements. Furthermore, the covering of near-surface structures by the first reflection signals is treated by a subspace based filtering approach and signal reverberation artifacts are suppressed by predictive deconvolution. © 2013 IEEE.

Authors with CRIS profile

Thomas Scharrer Lehrstuhl für Autonome Systeme und Mechatronik Andreas Koch Lehrstuhl für Autonome Systeme und Mechatronik Stefan Rupitsch Lehrstuhl für Autonome Systeme und Mechatronik Alexander Sutor Lehrstuhl für Autonome Systeme und Mechatronik Helmut Ermert Lehrstuhl für Hochfrequenztechnik Reinhard Lerch Lehrstuhl für Autonome Systeme und Mechatronik

How to cite

APA:

Scharrer, T., Koch, A., Rupitsch, S., Sutor, A., Ermert, H., & Lerch, R. (2013). Ultrasonic imaging of a turbine blade model using a 360° synthetic-aperture-focusing-technique and reverberation suppression. In 2013 IEEE International Ultrasonics Symposium Proceedings (pp. 150-153). Prague, CZ.

MLA:

Scharrer, Thomas, et al. "Ultrasonic imaging of a turbine blade model using a 360° synthetic-aperture-focusing-technique and reverberation suppression." Proceedings of the 2013 IEEE International Ultrasonics Symposium, IUS 2013, Prague 2013. 150-153.

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