By Byron B. Brenden (auth.), Glen Wade (eds.)
The most modern development in acoustical holography and comparable study components, commonly related to imaging through acoustic waves, used to be mentioned and taken care of extensive on the Fourth foreign Symposium on Acoustical Holography, held in Santa Barbara, California on April 10-12, 1972. This quantity comprises the complaints of that symposium. because the papers provided the following point out, a num ber of startling advances were learned within the cutting-edge considering that e-book of quantity three of Acoustical Holography. development has been partic ularly outstanding within the box of acoustical imag ing. The Fourth foreign Symposium represents anything of alandmark convention during this recognize. The scope of this quantity is considerably large er than the time period "acoustical holography' frequently implies and encompasses the entire zone of visualiza tion, detection, and recording of sound fields no matter if with lengthy wavelengths, microwaves, or with extrememly brief sound wavelengths. The 37 sympo sium papers look the following each one as aseparate bankruptcy. commonly, the paintings said bargains almost always with ex perimental and theoretical advancements within the a bove parts. This paintings has major useful power use by way of seismic sensing, less than water imaging, non-destructive checking out, real-time acoustic microscopy, and clinical diagnosis.
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Additional info for Acoustical Holography: Volume 4 Proceedings of the Fourth International Symposium on Acoustical Holography, held in Santa Barbara, California, April 10–12, 1972
Walker for the concept of digital-analog processing. REFERENCES 1. B. B. Brendon and D. R. Hoegger, "Acoustical Holography with Real-time Color Translation," Acoustical Hologpaphy, Vol. 2, Chapter 21, Plenum Press, New York (1970) 2. P. S. Green, "A New Liquid-surface-relief Method of Acoustic Image Conversion," Acoustical Holography, Vol. 3, Chapter 10, Plenum Press, New York (1971) 3. H. R. Farrah, E. Marom, and R. K. Mueller, "An Underwater Viewing System Using Sound Holography," Reference 1, Chapter 12 4.
The mozaic was cut from a 2"X2"-square of PZT4. The opposite face of the mozaic has a continuous ground electrode which is exposed to the water in the imaging tank. 5-MHz source. Amplitude at each element is controlled by a field-effect transistor (FET) acting as an amplitude modulator. To distribute the holographie modulation pattern on the array of modulators, the video signal from the receiving array is demultiplexed and stored as a charge on a capacitor at the gate of each FET. The stored charge decays and is renewed with each hologram frame.
In view of the slow-motion nature of'underwater 33 34 J. L. WEAVER AND G. C. KNOLLMAN phenomena, "real-time" reconstruction here will include scan rates as low as 2 frames/sec. HYDROACOUSTIC SCANNING SYSTEM The reeonstruction teehniques described herein were proposed and partially developed for use with a previously deseribed hydroacoustie seanning system5 • This system consists of aplane, oseillatory scanning mirror and a linear array of 100 transdueer elements. 4 frames/sec. The array is sampled eleetronieally at a rate of 240 lines/sec to provide holographie video output equivalent to approximately 7500 elements/frame.