Design and fabrication of annular arrays for high-frequency ultrasound |
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Authors: | Brown Jeremy A Démoré Christine E M Lockwood Geoffrey R |
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Affiliation: | Department of Physics, Queen's University, Kingston, ON, Canada. 7jab4@qlink.queensu.ca |
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Abstract: | The design, fabrication, and performance of miniature high-frequency annular arrays are described. A 50-MHz, 2-mm-diameter, 7-element, equal-area annular array was fabricated and tested. The array elements were defined using photolithography and the electrical contacts were made using ultrasonic wire bonding. The resulting transducer produced pulses with a -6 dB bandwidth of 52% and an insertion loss of -16 dB. A radiation pattern was collected by scanning the transducer array above the tip of a glass fiber. A -6 dB two-way beam width of 75 microns was found at f/2. The radiation pattern decreased smoothly to less than -60 dB at a distance of 550 microns. |
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