Ultrasound radiation device into a material

Details Ultrasound radiation device into a material Ultrasound radiation device into a material

2007-08-28

2007-08-28

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C600S459000, C367S140000, C367S157000, C367S164000

Reexamination Certificate

active

11267602

ABSTRACT:
When input electric signals Ei(i=1, 2, . . . , n) with frequencies fi(i=1, 2, . . . , n), respectively, are applied to an input interdigital transducer, elastic waves are excited in a piezoelectric substrate. Leaky components of the elastic waves are radiated into a material in the form of longitudinal waves, which are reflected at a bottom boundary-surface of the material. One of reflected longitudinal waves are detected at an output interdigital transducer as a delayed output signal with one of the frequencies fi. When the delayed output signal is applied to at least one interdigital transducer for radiation, an elastic wave is excited in the piezoelectric substrate. A leaky component of the elastic wave is radiated into the material in the form of a longitudinal wave, which is reflected at the bottom boundary-surface and re-reflected at a top boundary-surface of the material, and thus a continuous reflection occurs.

REFERENCES:
patent: 3950713 (1976-04-01), Lewis
patent: 6317389 (2001-11-01), Toda
patent: 6360611 (2002-03-01), Toda
patent: 6522047 (2003-02-01), Toda

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