Acoustical Imaging: Visualization and Characterization - download pdf or read online

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

ISBN-10: 1468437550

ISBN-13: 9781468437553

ISBN-10: 1468437577

ISBN-13: 9781468437577

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COLLINS 48 COMPOSITE SCAN SIMULTANEOUS SOURCE'REC~ER ~ SCAN ~ ~ A \/~ \f ,/ / ~~ ' I'I 120 ELEMENT RECEIVE · ARRAY '\1 t //' \ / \ \ 7cm \ \ I 23cm 1'1 II \ I \ /~----,\ 23cm FIGURE 5. 6cm FOCUS LINE SOURCE I I I I' I I \ \ I \ I \ HOLOGRAM CONSTRUCTION GEOMETRICS OF THE METAL LETTER "H" edges are defined by the high frequency fringes and the low contrast interior with the low frequency fringes. Figure 6b is the reconstructed image (simultaneous sourcereceiver scan) of the letter "H". The image exhibits extremely sharp defined edges illustrating the high resolution capabilities of the system.

Ju-_ _ _ _ SIDE VIEW FIGURE 9. 4 DIA. L 2mm .. t.. 5mm TOP VIEW OF "Y" PATTERN SCHEMATIC OF ALUMINUM BLOCK FOR LONGITUDINAL WAVE LATERAL RESOLUTION TESTS (2 mm, 4 mm & 8 mm) H. D. COLLINS 52 Figure lOa is the holographic reconstruction (simultaneous source-receiver scan) for comparison with the composite system. The "y" pattern image is of excellent quality and graphically illustrates the high resolution capabilities of the simultaneous source-receiver scanning configuration. The holes even appear circular as, for example, the hole at the extreme left side of the pattern.

5 mm in water. According to Example II, the frequency series was determined with nonuniform spacing. 9146 MHz, ... 9985 MHz, f21 = 1. 0015 MHz, ... , f'+ 0 = 1. 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.

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


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