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Sampling phased array, a new technique for ultrasonic signal processing and imaging now available to industry

: Verkooijen, J.; Bulavinov, A.

Fulltext urn:nbn:de:0011-n-1036364 (1.7 MByte PDF)
MD5 Fingerprint: 2225e3452b14254d09434b00bef478b0
Created on: 27.8.2009

International Committee for Non-Destructive Testing -ICNDT-; Chinese Society for Non-destructive Testing -ChSNDT-:
17th World Conference on Nondestructive Testing : Shanghai, China, October 25 - 28, 2008
Shanghai, 2008
Paper 452
World Conference on Nondestructive Testing (WCNDT) <17, 2008, Shanghai>
Conference Paper, Electronic Publication
Fraunhofer IZFP ()
ultrasonic; phased array; weld inspection; turbine shaft inspection

Over the past 10 years the improvement in the field of microelectronics and computer engineering has led to significant advances in ultrasonic signal processing and image construction techniques that are currently being applied to non-destructive material evaluation. A new phased array technique, called "Sampling Phased Array" has been developed in the Fraunhofer Institute for non-destructive testing [1]. It realizes a unique approach of measurement and processing of ultrasonic signals. The sampling phased array principle makes use of the measurement of elementary waves generated by individual elements of a sensor array to reconstruct the composite
phased array signal for any arbitrary angle or focus depth. The use of special signal processing and image reconstruction algorithms, allows generating A-Scans of several angles and / or Sector-Scans, which can be implemented in real time. With parallel computing structures, this principle is used for automatic testing systems at very high inspection speed. A comparative study was done with Conventional Phased Array and the Sampling Phased Array technique. The study shows that the signal characteristics in both techniques are equal. In addition, the Sampling Phased Array technique is significantly beneficial in many aspects like quality of information in specific cases, inspection speeds and adaptability to specific inspection tasks in comparison to conventional Phased Array.
The development results, including relevant test methodology and equipment aspects are presented in the current work, together with the benefits for industrial ultrasonic inspection. The electronics required to enable the application of Sampling Phased Array, was, in the first instance created as a development platform for high speed automated ultrasonic inspection systems. This came from the requirement to speed up the inspection of manufacturing testing and of course the testing of critical components. Sonovation have now adapted Sampling Phased Array in their data acquisition and display equipment line, "Sonovision".