| 摘要 |
An enclosure for a transduction element incorporates a geometrically shaped acoustically reflective shell. This acoustically reflective shell is shaped so that the inner surface thereof is at a least a section of that shape generated when an ellipse is rotated around a line which, lies in the plane of the ellipse, is oriented at any angle to the major axis of the ellipse, and contains one focus of the ellipse, or that shape generated when a continuum of ellipses having identical major axes are placed about a line which, lies in the plane of all the ellipses, is oriented at any angle with respect to the major axes of the ellipses, and contains a focal point common to all the ellipses. Such geometrically generated shapes will have one common focus and one distinct focal line. A transduction element placed about this focal line will, in operation, cause acoustic radiation to be focused and concentrated at a common focal point such that the common focus will act as a singular source of phase coherent acoustic radiation of any desired frequency independent beamwidth. Finally, by appropriate selection of transduction element and reflective shell composition, the device may operate as a transmitter of electromagnetic radiation.
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