Titlebook: Acoustical Holography; Volume 1 Proceedings A. F. Metherell,H. M. A. El-Sum,Lewis Larmore Conference proceedings 1969 Plenum Press 1969 dif

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250. Unfortunately, the size of the auditorium of the Douglas Advanced Research Laboratories required that attendance be by invitation only, and many deserving and interested scientists could not be present. This volume presents the proceedings of the symposium, and hopefully will help compen­ sate

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https://doi.org/10.1007/978-3-540-70982-4ound holography is presented. The rest of the paper dwells upon the various techniques in sound holography, pointing out similarities to and diversities from optical holography, chief advantages of each technique, and limitations or drawbacks of such approaches.

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WIE SIEHT EINE BOHRANLAGE AUS?,is may open a new field in ultrasonics: “correlation filtering” comparable in principle to the filtering methods used in optics. Some preliminary results are demonstrated, and it is shown that this method could be used for flaw recognition.

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,Konsequenzen für die Zulieferindustrie,ic and chemical methods to values at least 11 orders of magnitude lower for the electronic techniques. The thermal techniques require ultrasonic intensities on the order of 0.1 W/cm.; the optical and mechanical methods require an average intensity of about 10. W/cm.. Examples of images produced by many of the detection techniques are given.

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https://doi.org/10.1007/978-3-540-70982-4 of achieving the resolution expected on the basis of the wavelengths and hologram apertures used. The sensitivity of the scanned hologram method greatly exceeds that of the liquid surface method but this advantage is offset by the capability for real-time imaging of the liquid surface method.

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