Multiple field acoustic focusser

Measuring and testing – Vibration – By mechanical waves

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Details

181176, 367150, 367155, G10K 1130

Patent

active

043875998

ABSTRACT:
The invention provides a highly focussed ultrasonic wave throughout a large depth of field without any mechanical motion. One embodiment of the invention providing two focussed fields includes a front to back arrangement of a converging lens, a transducer without any backing material to dissipate ultrasound, a converging lens, and a transducer. To focus in the far field, the front transducer transmits and receives via the front lens. To focus in the near field, the rear transducer transmits and receives via both lenses which collectively focus in the near field.

REFERENCES:
patent: 3913061 (1975-10-01), Green
patent: 3995179 (1976-11-01), Flournoy et al.
patent: 4016751 (1977-04-01), Kossoff
patent: 4097835 (1978-06-01), Green
patent: 4138895 (1979-02-01), Mezrich
patent: 4213344 (1980-07-01), Rose

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