Development of a 20 MHz annular-array - a first step to a multichannel microscope

This paper describes the development of an annular-array transducer with a center frequency of 20 MHz constructed of custom-built composite material. In contrast to linear element arrays, annular-arrays work effectively despite a small number of large transducer elements. The active aperture and the...

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Bibliographic Details
Main Authors: Juhrig, André, Schmidt, Ulrike, Wolf, Mario, Kühnicke, Elfgard
Format: Conference Proceeding
Language:English
Online Access:Request full text
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Summary:This paper describes the development of an annular-array transducer with a center frequency of 20 MHz constructed of custom-built composite material. In contrast to linear element arrays, annular-arrays work effectively despite a small number of large transducer elements. The active aperture and the layout of the array are optimized by sound field calculation. Despite the large elements of the annular-array, contact plating and bonding of the 20 MHz annular-array transducer is a challenge due to physical as well as chemical properties of the composite material. An annular-array with four quartered rings (16 elements) and an outer diameter of 5.4 mm (aperture) was manufactured. The sound fields of the different elements are characterized by scanning with a point reflector in water.
ISSN:1939-800X
DOI:10.1121/2.0001144