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Acoustical Imaging: Visualization and Characterization by B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)

By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)

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Acoustical Ho1ograp~, Vol. 5, (edited by P. J. Green), Plenum Press, NY, 1973. 6. Collins, H. D. and Hildebrand, B. , Evaluation of Acoustical Holography for the Inspection of Pre~sure Vessel Sections, book, (Periodic Inspection of Pressure Vessels), Institution of Mechanical Engineers, 1972.

Therefore, this example will be usefull when no objects are located outside the object region. Example III The spacing of the receiver elements is a little less than the wavelength. 7, where the point target is placed at (0,0,120A c )' remainders of the grating lobes of the frequency series appears far from the receiver array along the axis. 7 Fig. 5. Wide perspective view of the point-spread function of Example II. (Area of view: 158 x 158 AC 2 ) Fig. 6. Perspective view of an image reconstructed from a simulated hologram matrix of seventeen point-targets.

0854 MHz. 00455 MHz. 4 mm. 6 rom x 25 rom in order to have a relatively uniform element factor in the image plane, but sharply collimate in the direction perpendicular to the image plane. We made the transducer array cutting a 100 x 25 xL 3 rom 3 PZT plate of uniform characteristics attached on a flat surface of a backing material by a precise cutting machine. 037 MHz. These results show how this transducer array has uniform characteristics. An equivalent circuit of each transducer at its resonance frequency is parallel connection of 1 kD and 140 pF.

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