By J. R. Suarez, K. W. Marich, J. F. Holzemer, J. Taenzer (auth.), Newell Booth (eds.)
This quantity includes the complaints of the 6th foreign Symposium on Acoustical Holography and Imaging, held in San Diego, California, February 4-7, 1975. The name of this symposium differs from that of the 1st 4 by way of the addition of the notice "Imaging", reflecting a rise in emphasis on nonholographic tools of acoustical visualization. For comfort, no switch has been made within the name of this released sequence. The 38 papers awarded right here outline the state of the art within the quickly constructing box of acoustical holography and imaging. a lot of them describe purposes in such fields as clinical diagnostics, microscopy, nondestructive trying out, underwater viewing, and seismology. The Editor acknowledges the diligent efforts of the authors in advancing the expertise of Acoustical Imaging and thank you them for getting ready and filing descriptions in their paintings. The papers have been chosen with the capable information of this system Committee that con sisted of P.S. eco-friendly, Stanford study Institute; J.F. Havlice, Stanford Microwave Laboratory; B.P. Hildebrand, Battelle Northwest; D.R. Holbrooke, kid's clinic of San Francisco; P.N. Keating, Bendix learn Laboratories; A. Korpel, Zenith Radio company; B.J. McKinley, Lawrence Livermore Laboratory; A.F. Metherell, college of Miami; J. Powers, Naval Postgraduate institution; and F.L. Thurstone, Duke collage. The Editor appreciates assistance from the consultation chairmen: D.R. Holbrooke, kid's health facility of San Francisco; Mahfuz Ahmed, Zenith Radio company; R.K. Mueller, collage of Minnesota; G. Wade, collage of California at Santa Barbara; B.P.
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Extra info for Acoustical Holography: Volume 6
Example text
N > ,.... 3 0 ;oa c: OBJECTIVE LENS POSITION SENSING DETECTOR " A-0 INTERFACE MIRROR NO. tt -1 :I: K. R. ERIKSON ET AL. 46 Patient Coupling Interface The waterbags were vacuum formed from 10 mil polyethylene. After some experimentation an optimum bag shape was evolved. The coupling bags produced no noticeable artifacts or other problems except when imaging an object with a small radius of curvature such as an arm. In the case of a large relatively flat area such as the pregnant abdomen, excellent contact was achieved routinely.
Mirrors 3-9 are required for folding the system for compactness. The path length adjustment between mirrors 4 and 5, and the beam-splitter was needed to adjust the relative path K. R. ERIKSON ET AL. 48 lengths of the object and reference beam since the coherence length of the laser is only a few centimeters. This did not prove to be a ciritical adjustment. The reference beam passes through an optical phase modulator (discussed below), a spatial filter, a collimator lens and then passes through a prism which deflects the light to an angle of 30 degrees at the film plane.
At the edge of the beam where classical Fresnel edge diffraction occurs, there are large fluctuations in phase and amplitude. The transducer material is a modified barium titanate made by Channel Industries, Santa Barbara, California. An integral glaze ceramic on the front face allows the transducer to be operated directly into water without the requirement for an additional insulating or corrosion resistant medium. 1 MHz where each plate has an electrical impedance of 16 ohms which is ideally suited to transistor power amplifiers.