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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Reconstructed image of circle-shaped sixteen point-targets. (Experiment) (a) Perspective view, (b) Gray scale view. T. MIYASHITA ET AL. 36 y 'l'RANSMI'M'ER ARRAY FREQUENCY; f . •. : Fig. 11. A proposal of three-dimensional imaging by means of multi-frequency hologram matrix. DISCUSSION Simultaneous detection of the signals of all the receiver elements will make measurement of a 37 x 40 hologram matrix possible within 30 ms. Image reconstruction of 80 x 80 pixels will be done in one minute by a high-speed mini-computer with a multiply and divide hardware for 32 bit integers.

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. The simulated internal defect consists of a "y" pattern with various edge-to-edge hole separations in each appendage.

Nk + Yn + nk}] 12 , (14) where "hologram matrix" Hnk is the complex amplitude detected by the n-th receiver element when an object is illuminated by the transmitter at the k-th frequency, and ank's are introduced to compensate nonuniform phase characteristics of the receiver elements and transmitter. Amplitude compensation may be included into ARn and AFk' if effective. THREE EXAMPLES OF RECEIVER ARRAY AND FREQUENCY SERIES We designed three representative examples of receiver array and frequency series, whose specifications are shown in Table 1.

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