By J. R. Suarez, K. W. Marich, J. F. Holzemer, J. Taenzer (auth.), Newell Booth (eds.)
This quantity comprises the lawsuits of the 6th overseas Symposium on Acoustical Holography and Imaging, held in San Diego, California, February 4-7, 1975. The identify of this symposium differs from that of the 1st 4 by means of the addition of the note "Imaging", reflecting a rise in emphasis on nonholographic tools of acoustical visualization. For comfort, no swap has been made within the identify of this released sequence. The 38 papers provided right here outline the state of the art within the speedily constructing box of acoustical holography and imaging. lots of them describe functions in such fields as scientific diagnostics, microscopy, nondestructive trying out, underwater viewing, and seismology. The Editor acknowledges the diligent efforts of the authors in advancing the know-how of Acoustical Imaging and thank you them for getting ready and filing descriptions in their paintings. The papers have been chosen with the capable tips of this system Committee that con sisted of P.S. eco-friendly, Stanford examine Institute; J.F. Havlice, Stanford Microwave Laboratory; B.P. Hildebrand, Battelle Northwest; D.R. Holbrooke, kid's health center of San Francisco; P.N. Keating, Bendix examine Laboratories; A. Korpel, Zenith Radio company; B.J. McKinley, Lawrence Livermore Laboratory; A.F. Metherell, collage 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, college of Minnesota; G. Wade, college of California at Santa Barbara; B.P.
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Extra info for Acoustical Holography: Volume 6
ERIKSON ET AL. INTERPRETATION HOLOGRAPHIC IMAGE (b) (c) Figure 14. Continued THROUGH-TRANSMISSION ACOUSTICAL HOLOGRAPHY 35 week of gestation, demonstrates the typical appearance of a near-term fetus in vivo in the vertex position (Figure 14a). The sensitivity of the system is noted to be sufficient. Fetal p~rts which can be identified include the abdominal wall, the dorsolumbar spine, lower ribs, pelvis, and lower extremities. Fetal motion was observed in the movie reconstruction and is shown here in Figures 14a, b and c.
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.
The balloon disappeared completely when filled with water, implying that the rubber itself is thin enough 24 K. R. ERIKSON ET Al. Figure 7. Fluid Filled Test Objects to have no appreciable effect on the sound wave. 5 mm is reached. The only effect of further reduction of velocity difference is a decrease of edge contrast. This is the resolution limit for a 1 MHz system. A theoretical curve for apparent edge thickness due to critical angle reflection is also shown in Figure 8. Because our experimental data indicate edge thicknesses greater than those expected from critical angle reflection alone, another explanation for edge enhancement was sought.