Measuring and testing – Vibration – By mechanical waves
Patent
1990-02-12
1991-04-09
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73626, G01N 2904
Patent
active
050054180
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 image may be selected from the image 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 threee dimensional volume may be viewed on a two dimensional display.
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Arana Louis M.
Williams Hezron E.
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