Synthetic Aperture Focusing Techniques in the Near Field of a Focused Transducer
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Synthetic aperture focusing techniques (SAFT) represent a special class of beam steering algorithms [1] that are used to improve the resolution and signal-to-noise ratio (SNR) of ultrasonic images. It has been traditionally performed using focused transducers, with the test material located in a region where the ultrasonic beam diverges beyond the focal point [2,3]. This is to ensure that the transducer collects enough data relating to the defect. Operating in the far-field of the transducer where the spatial field variations are slow minimizes the error.