By H. M. A. El-Sum (auth.), A. F. Metherell, H. M. A. El-Sum, Lewis Larmore (eds.)
Only an area challenge of one hundred fifteen seats avoided this primary overseas Symposium on Acoustical Holography from having an attendance of over 250. regrettably, the dimensions of the auditorium of the Douglas complicated study Laboratories required that attendance be by means of invitation purely, and lots of deserving and scientists couldn't be current. This quantity offers the court cases of the symposium, and optimistically may also 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 now not got in time to be learn yet is incorporated in those lawsuits. The presence of Professor Dennis Gabor significantly stronger the casual periods, which often grew to become as lively as one may perhaps anticipate in a brand new box. Dr. H. M. A. El-Sum, a specialist to the Douglas complicated learn Laboratories and a pioneer within the box of holography, set the level with the 1st paper. He supplied a normal advent to the actual ideas and functional equipment enthusiastic about optical and acoustical holography. His paper additionally integrated a precis of assorted particular suggestions at present utilized in sound holography, with the benefits, negative aspects, and barriers 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
Am. 42:1169 (1967). 23. L. Larmore, H. M. A. EI-Sum, and A. F. Metherell, J. Opt. Soc. Am. 58:730 (1968). 24. 1. W. Goodman, Appl. Phys. Letters 8:311-313 (1966). 25. 1. E. 1acobs, paper No. II presented at the IEEE Symposium on Sonics and Ultrasonics, Vancouver, Canada, Oct. 1967. 26. D. Gabor, French Patent No. 1,479,712 (March 28, 1967). 27. A. Korpel and P. Desmares, J. Acoust. Soc. Am. (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.
In Chapter 11 Wade et al. show that at certain angles of incidence opaque sound objects may become transparent, a fact which one should be aware of in order to avoid misinterpretation of the reconstructed images. Again, I would like to emphasize that recording media deserve serious attention, since fast recording can solve many of the other problems in this area. Finally, with regard to the quality of the reconstructed images, it should be noted that these images never compete with those made optically, simply because the resolution is determined by the acoustic wavelength (making the hologram), which is much larger than the optical wavelength, and also because e of the specular reflection.
Most reported systems are pulse-echo types, in the frequency range from 1 to 10 MHz, and make use of quartz or ceramic transducers. Resolution capabilities of the order of one to a few mm and threshold sensitivities oflO- 11 W /cm 2 or less seem readily achievable with such techniques. In the case of the array systems threshold sensitivities of that order, and as low as 5 x 10- 12 W /cm 2 , have been reported 4 ). Since a piezoelectric transducer actually acts as a mosaic C1), in that the voltage signal at any location on the piezoelectric detector is proportional to the incident ultrasonic intensity at that point, images can be prepared without moving the object or detector by suitably recording the voltage variations on a number of locations on a piezoelectric detector of reasonable size.