By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)
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Additional info for Acoustical Imaging: Visualization and Characterization
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. 6, p. 193 (Plenum Press, New York, 1975). FOCUSED LINE SOURCE LINEAR ARRAY HOLOGRAPHY USING A THREE DIMENSIONAL COMPUTER RECONSTRUCTION SYSTEM H. Dale Collins, Tom E. Hall and Richard L. O. Box 999, Richland, Washington 99352 ABSTRACT This paper describes a unique holographic scanning configuration and computer reconstruction technique for the inspection of thickwalled nuclear pressure vessels.
Figure 4b is the corrected stigmatic hologram. The display aspect ratio was corrected using Eq. (21). LATERAL AND LONGITUDINAL RESOLUTION The image resolution, as a function of object to hologram distance, effective aperture and frequency, is an extremely important parameter to verify experimentally. , depth) using a focused source is given by the following equations: Lateral Resolution (~r) ~ H a (22) H. D. COLLINS 46 (a) (b) FIGURE 4. ACOUSTIC HOLOGRAMS OF A POINT OBJECT ON AXIS (a) ASTIGMATIC HOLOGRAM (b) CORRECTION ASPECT RATIO (1:2) HOLOGRAM Longitudinal Resolution (~z) _ '(_af )2 A (23) where >..
In the second type, we introduced a method 2 in which a transmitter array and a receiver array were placed in the imaging plane so that their synthesized beams may intersect with each other at right angles at the center of the image region. Experiments 3 showed that this method gives good two-dimensional resolution and a high SiN ratio. It has, however, one demerit that the direct acoustical coupling between the transmitter and the receiver must be excluded by an acoustical absorber placed between them, although the electrical coupling is easily kept away with the electrical shield.
Acoustical Imaging: Visualization and Characterization by B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)