By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)
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Additional resources for Acoustical Imaging: Visualization and Characterization
IEEE, vol. 66, p. 1287 (1978). Shibayama, "Twodimensional imaging by means of multi-frequency hologram matrix -An ultrasound experiment," Proc. IEEE, to be published. Karg, "Multifrequency microwave holography," AEiJ, Band 31, p. 150 (1977). Karg, "Multifrequency acoustical holography," IEEE Trans. Sonics and Ultrasonics, vol. SU-26, p. 279 (1979). Gilbert, "Digital computer simulation study of a real-time collection, post-processing synthetic focusing ultrasound cardiac camera," Acoustical Holography, vol.
The holes in all three legs are resolved as predicted with simultaneous source-receiver scanning. Figure l2b is the reconstructed image from the composite configuration. The "x" direction resolution is approximately 6 mm and, thus not adequate to resolve the pattern. All holes have merged in the image as shown in Figure llb. Figure l2c is the photograph of the hole pattern viewed from the bottom of the block. "y" Pattern (45 0 S-Wave) Holographic Resolution Tests (1 mm, 2 mm and 4 mm) at Variable Depths in 23 cm Thick Metal Block Figures l3a and b illustrate the transverse or shear wave hologram construction geometry.
C 2 ) (Example III) is 240 x 240 A. c) and (0,0,230A. 8 reconstructed from a calculated hologram matrix of a circle with a diameter of 70 A. c is very clear over all. These designed parameters will be useful 1 for higher frequencies than those for the previous two examples. EXPERIMENTAL RESULTS Experimental investigations were made with acoustical wave. Several objects composed of thin strings were imaged in a water tank using the parameters of Example II of the previous section. Specification of the Frequency Series and Transducer Array We chose the center frequency fc = 1 MHz, then A.