By H. M. A. El-Sum (auth.), A. F. Metherell, H. M. A. El-Sum, Lewis Larmore (eds.)
Only an area problem of one hundred fifteen seats avoided this primary foreign Symposium on Acoustical Holography from having an attendance of over 250. regrettably, the dimensions of the auditorium of the Douglas complicated learn Laboratories required that attendance be by way of invitation purely, and lots of deserving and scientists couldn't be current. This quantity provides the complaints of the symposium, and confidently might help compen sate these people who have been not able to wait. The symposium itself consisted of 16 formal papers. The seven teenth, by means of Dr. P. Greguss, used to be no longer acquired in time to be learn yet is integrated in those complaints. The presence of Professor Dennis Gabor significantly superior the casual periods, which regularly grew to become as lively as one may anticipate in a brand new box. Dr. H. M. A. El-Sum, a specialist to the Douglas complex study Laboratories and a pioneer within the box of holography, set the level with the 1st paper. He supplied a basic creation to the actual ideas and sensible equipment curious about optical and acoustical holography. His paper additionally incorporated a precis of varied particular strategies at present utilized in sound holography, with the benefits, negative aspects, and obstacles concerned for every approach.
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Additional info for Acoustical Holography: Volume 1 Proceedings of the First International Symposium on Acoustical Holography, held at the Douglas Advanced Research Laboratories, Huntington Beach, California December 14–15, 1967
Although the scanning lines are too close to be seen, their effect can be seen in producing the first-order Moire pattern at the bottom (a secondary zone plate). Thus with the arrangement used to record Fig. 14 the extent ofthe object perpendicular to the scanning lines should be less than half the distance between the centers of the original and the secondary zone plates. DIRECT VISUALIZATION OF SOUND FIELD BY BRAGG DIFFRACTION OF LIGHT Although this technique does not belong to acoustical holography in the true sense (because of the absence of a reference wave), it is so close and important that it deserves inclusion here.
Sept. 1968). 28. R. Adler, A. Korpel, and P. Desmares, paper No. N3 presented at the IEEE Symposium on Sonics and Ultrasonics, Vancouver, Canada, Oct. 1967. 29. A. Korpel, R. Adler, P. Desmares, and W. Watson, Appl. Optics 5: 1667-1675 (1967). 30. A. Korpel, Appl. Phys. Letters 9: 425-427 (1966). 31. C. 1 presented at the IEEE Symposium on Sonics and Ultrasonics, Vancouver, Canada, Oct. 1967. 32. O. K. Mawardi, Rept. Progr. Phys. 21: 156 (1956). 33. A. F. Metherell, H. M. A. EI-Sum, 1. 1. Dreher, and L.
Many of the photographic and phosphor methods do provide simplicity and attractive resolution capability. The one major disadvantage of most of these methods is the relatively poor threshold sensitivity. The electroluminescent phosphor approach, when fully developed, promises to ease that difficulty and yet retain the other advantages of the film and phosphor technique. The liquidcrystal thermal detection technique also shows promise. The television detection method offers a number of advantages, such as low threshold sensitivity, good resolution, and real-time presentation.