Method controlling the focusing of an ultrasonic field and appar

Details Method controlling the focusing of an ultrasonic field and appar Method controlling the focusing of an ultrasonic field and appar

1986-12-12

1988-02-16

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

367150, 73 1DV, 73642, H04B 1700

Patent

active

047259892

ABSTRACT:
The invention concerns a method for surveying the focal point (F, F') of a focussed ultrasonic field (8, 14) and an apparatus for carrying out the method. According to the invention an ultrasonic field (4, 12) produced by an ultrasonic transmitter (2) is measured at several sites in a plane in the path of the waves at the site of the imaging device (6). The values determined at these sites are compared with given reference values for which the position of the focus is known. In an advantageous device, one surface of the imaging device (6) is equipped with several piezoelectric transducers.

REFERENCES:
patent: 4387599 (1983-06-01), Samodovitz
patent: 4430883 (1984-02-01), Auphan
patent: 4440025 (1984-04-01), Hayakawa et al.
patent: 4475376 (1984-10-01), Keilman
patent: 4476549 (1984-10-01), Dragonette et al.
patent: 4510810 (1985-04-01), Kanda et al.
patent: 4576034 (1986-03-01), Ferree et al.

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