Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1986-06-24
1988-10-18
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367151, 181176, G01S 968
Patent
active
047792418
ABSTRACT:
An acoustic lens arrangement having at least one transducer for the generation and/or for the reception of a plane acoustic wavefield. The arrangement includes a focusing surface for focusing the acoustic wavefield in an object region and at least one medium for the low-loss transmission of the acoustic wavefield between a transducer, the focusing surface and the object region to be investigated. The longitudinal axis of the focusing surface is inclined relative to the direction of the normal to the acoustic wavefield in such a manner that when the longitudinal axis is positioned normal to the surface of the object region, the acoustic beams incident thereon form a critical angle .theta..sub.R with the normal to the surface of the object.
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Appl. Phys. Lett. 42(5), Mar. 1, 83, "Confocal Surface Acoustic Wave Microscopy", R. Smith and H. K. Wickramasinghe, pp. 411-413.
J. Appl. Phys. 55 (1), Jan. 1, 84, "A New Focusing Method for Nondestructive Evaluation by Surface Acoustic Wave", B. Nongaillard, M. Ourak, J. M. Rouvaen, M. Houze, and E. Bridoux, pp. 75-79.
Atalar Abdullah
Koeymen Hayrettin
Ernst Leitz Wetzlar GmbH
Pihulic Daniel T.
Tarcza Thomas H.
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