Focussing of ultrasonic waves in air using a micromachined Fresnel zone-plate

Author: Schindel D.W.   Bashford A.G.   Hutchins D.A.  

Publisher: Elsevier

ISSN: 0041-624X

Source: Ultrasonics, Vol.35, Iss.4, 1997-06, pp. : 275-285

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Abstract