Acoustical Holography: Volume 1 Proceedings of the First by H. M. A. El-Sum (auth.), A. F. Metherell, H. M. A. El-Sum,

By H. M. A. El-Sum (auth.), A. F. Metherell, H. M. A. El-Sum, Lewis Larmore (eds.)

Only an area predicament of one hundred fifteen seats avoided this primary foreign Symposium on Acoustical Holography from having an attendance of over 250. regrettably, the scale of the auditorium of the Douglas complex study Laboratories required that attendance be via invitation in basic terms, and plenty of deserving and scientists couldn't be current. This quantity provides the lawsuits of the symposium, and optimistically can help compen­ sate these people who have been not able to wait. The symposium itself consisted of 16 formal papers. The seven­ teenth, through Dr. P. Greguss, was once now not acquired in time to be learn yet is incorporated in those court cases. The presence of Professor Dennis Gabor significantly greater the casual classes, which regularly turned as lively as one may possibly anticipate in a brand new box. Dr. H. M. A. El-Sum, a specialist to the Douglas complicated examine Laboratories and a pioneer within the box of holography, set the degree with the 1st paper. He supplied a basic creation to the actual rules and sensible tools taken with optical and acoustical holography. His paper additionally incorporated a precis of varied particular recommendations presently utilized in sound holography, with the benefits, hazards, and boundaries concerned for every approach.

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49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72. 73. 74. 75. 47 H. Tielsch and A. Boczek, Z. Angew. Physik 7:213-218 (1955). J. L. Fergason, Sci. Am. 211 :76 (August 1964). W. E. Woodmansee, Materials Evaluation 24: 564-572 (1966). W. E. Woodmansee and H. L. Southworth, Thermal Nondestructive Testing With Cholesteric Liquid Crystals, in: Fifth International Conference on Nondestructive Testing, Montreal, Canada, May 1967, to be published. M. Leistner and L.

21. A. F. MethereIl and H. M. A. EI-Sum, Appl. Phys. Letters 11 :20-22 (1967). 22. A. F. MethereIl and H. M. A. , 1967a; J. Acoust. Soc. 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.

The stock solution contained 30 g of iodine in II of methyl alcohol. 5 to 50 ml of stock iodine solution per gallon of water. 32 Harold Berger quickly in areas where the ultrasonic intensity, and therefore agitation of the developer, is highest. A thorough study of this technique with photographic paper has been made and reported by Arkhangel'skii and Afanas'ev C2 ). 6. 05 W /cm 2 for a high developer concentration and an exposure time of 40 sec. Exposure times could not be too long or the paper would develop completely.

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