By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)
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Extra resources for Acoustical Imaging: Visualization and Characterization
This pattern has been used extensively in holographic resolution tests over the last few years. 54 H. D. COLLINS ( ) FIGURE 12. - _ 120 elEMENT RECEIVE ARRAY 4mm ··Y·· PATTERN OF FLAT TOP DRILL HOLES END VIEW SIDE VIEW ~I I~ FIGURE 13. 8 cm to 10 cm, from the upper surface. , metal surface) and, thus will exhibit a lower resolution. Figure l4a is the holographic reconstruction of the "y" pattern obtained from the simultaneous source-receiver system. The 1 mm (edge-to-edge) holes are aligned in vertical "y" direction.
Electric characteristics of the measurement circuit of the inphase and quadrature components, composed of a preamplifier, doublebalanced mixers, integrators, sample and hold amplifiers, and analog to digital converters, were measured by changing the phase of the input signal over 720°. Calculated in amplitude and phase, the 34 T. MIYASHITA ET AL. 0°. These results are fairly satisfactory. Imaging Experiments "Point target" in the preceding sections means in a two-dimensional space, xz plane. • long enough, in the y direction.
10. It will be very satisfactory for the first experimental result of this method. 9(c) and nonuniformity of the reconstructed targets in intensity. A hologram matrix was measured also without any target in the water tank under the same condition, and a noise image was reconstructed. Its maximum intensity is 1. 10. We hope that the above somewhat unsatisfactory features are not due to noise but due to nonuniforrnity in overall phase characteristic not only between the transverse elements but also between the different frequencies.
Acoustical Imaging: Visualization and Characterization by B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)