Three dimensional imaging device using filtered ellipsoidal back

Details Three dimensional imaging device using filtered ellipsoidal back Three dimensional imaging device using filtered ellipsoidal back

1989-07-28

1992-02-25

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73626, G01N 2904

Patent

active

050902458

ABSTRACT:
A method and device for imaging three dimensions with a single pulse of energy is described. An embodiment is disclosed which uses a single monopolar transmitted pulse which radiates through a wide solid angular volume. Echoes caused by objects in this volume are detected by a large diameter, sparse circular array of receiver elements. The time history of each element is stored in a digital memory. A reconstruction processor uses this stored time history to reconstruct an image of the reflecting objects. A simple time of flight algorithm, based on Huygens principle, is used in the reconstruction. The algorithm automatically takes into account transmitted wave front curvature and makes no approximations such as fresnel or fraunhofer in the reconstruction. A circular array of receiver elements can be used, which is axicon, and is focused throughout the imaged volume. A perspective processor controls the reconstruction processor such that the volumetric image may be viewed from various perspectives. Tomographic images may be selected from the imaged volume at various positions and orientations. The perspective processor controls the reconstruction process such that the reconstructed points may be accumulated, summed and thus integrated so that a three dimensional volume may be viewed on a two dimensional display.

REFERENCES:
patent: 3676584 (1972-07-01), Plakas et al.
patent: 3717843 (1973-02-01), Farrah et al.
patent: 4131022 (1978-12-01), Mezrich
patent: 4332016 (1982-05-01), Berntsen
patent: 4395909 (1983-08-01), Steinberg et al.

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