Process for producing the output surface of a focused ultrasonic

Details Process for producing the output surface of a focused ultrasonic Process for producing the output surface of a focused ultrasonic

1993-09-14

1995-01-31

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

H04R 120

Patent

active

053863968

ABSTRACT:
The process comprises the steps of calculating, by varying the opening angle of a cluster, a first group of reference points of x, z coordinates in an incidence plane of the beam, so that the times taken by the ultrasounds to pass through the reference points and through the focal point are identical, then calculating a second group of reference points of y, z coordinates in a plane perpendicular to the incidence plane, defining two polynomials of degree 4 by polynomial interpolation by the method of least squares of the two previously calculated groups of points of the following form: f(x)-ax.sup.4 +bx.sup.3 +cx.sup.2 +dx g(y)=a'y.sup.4 +b'y.sup.3 +c'y.sup.2 +d'y, determining the x, y and z coordinates of the points of the output surface by the relation z=f(x)+g(y), and producing the output surface by means of the coordinates.

REFERENCES:
patent: 5193527 (1993-03-01), Schafer

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