Only a space limitation of 115 seats prevented this First International Symposium on Acoustical Holography from having an attendance of over 250. Unfortunately, the size of the auditorium of the Douglas Advanced Research Laboratories required that attendance be by invitation only, and many deserving and interested scientists could not be present. This volume presents the proceedings of the symposium, and hopefully will help compen sate those individuals who were unable to attend. The symposium itself consisted of sixteen formal papers. The seven teenth, by Dr. P. Greguss, was not received in time to be read but is included in these proceedings. The presence of Professor Dennis Gabor considerably enhanced the informal sessions, which frequently became as spirited as one might expect in a new field. Dr. H. M. A. El-Sum, a consultant to the Douglas Advanced Research Laboratories and a pioneer in the field of holography, set the stage with the first paper. He provided a general introduction to the physical principles and practical methods involved in optical and acoustical holography. His paper also included a summary of various specific techniques currently used in sound holography, with the advantages, disadvantages, and limitations involved for each approach.
Sprache
Verlagsort
Verlagsgruppe
Illustrationen
Dateigröße
ISBN-13
978-1-4615-8204-5 (9781461582045)
DOI
10.1007/978-1-4615-8204-5
Schweitzer Klassifikation
1 The Scope of the Symposium.- Definitions.- Generalized Principles of Holography.- Sound Recording.- Liquid Surface Deformation.- Scanning or Sampling Technique.- Effect of Scanning on Hologram Reconstruction.- Direct Visualization of Sound Field by Bragg Diffraction of Light.- General Remarks.- References.- 2 A Survey of Ultrasonic Image Detection Methods.- Photographic and Chemical Methods.- Thermal Techniques.- Optical and Mechanical Methods.- Electronic Methods.- Conclusions.- References.- 3 The Liquid-Gas Interface as a Recording Medium for Acoustical Holography.- The Wave Equation.- The Boundary Conditions.- The Surface Deformation.- The Surface Under Plane Wave Excitation.- General Surface Excitations.- Conclusion.- References.- 4 A Comparison of Acoustical Holography Methods.- Acoustical Holography Employing a Liquid Surface.- Ultrasonic Holography Using a Scanned Hologram Method.- Conclusions.- Acknowledgments.- References.- 5 Acoustic Holographic Techniques for Nondestructive Testing.- Experiments.- Theoretical Analysis and Discussion of Some Properties of Acoustical Holograms.- Potential Uses of Acoustical Holographic Techniques in Nondestructive Testing.- References.- 6 Application of Fourier Transforms in Assessing the Performance of an Ultrasonic Holography System.- A Criterion for the Maximum Frequency in a Hologram.- Analysis of the Effect of Scanning System on Recorded Information.- Analysis in the Fourier Transform Domain.- Practical Applications.- Summary.- References.- 7 Biomedical Prospects for Ultrasound Holography.- References.- Appendix. Ultrasound Holography and Visual Reconstruction.- 8 Acoustical Holographic Model of Cetacean Echo-Location.- References.- 9 The Generation of Sound.- Sound Generation.- Detection of Sound.- References.- 10Acoustical Imaging by Diffracted Light-Two-Dimensional Interaction.- Plane Wave Interaction Formalism.- Acoustical Imaging.- References.- 11 Acoustical Transparencies for Optical Imaging and Ultrasonic Diffraction.- Acoustical Transparencies.- Transparencies as Diffracting Screens.- Transparent Plates as Band-Pass Spatial Filters.- Transparent Plates for Velocity Measurement.- Conclusion.- References.- 12 Digital Image Formation from Detected Holographic Data.- Optical Image Reconstruction From Nonoptical Data.- Digital Image Reconstruction.- Effects of Quantization, Sampling, and Scan Nonuniformities.- Experimental Results.- Summary and Conclusions.- References.- 13 Phase Distortions Due to Nonlinear Effects in an Acoustic Field.- Formulation of the Problem.- The Interaction Terms.- Description of Interference Pattern.- The Second-Order Induced Field.- Phase Distortion in Wavefront.- Conclusion.- References.- 14 The Relative Importance of Phase and Amplitude in Acoustical Holography.- Experiments.- The Phase and Amplitude of an Object Wave.- Concluding Remarks.- Acknowledgments.- References.- 15 Acoustical Holograms and Optical Reconstruction.- Matrix Representation of Holographic Systems.- Construction of Acoustical Holograms.- Optical Reconstruction of Images.- Effect of Scanning Lines on the Reconstructed Images.- Effects of Hologram Construction Condition on the Reconstructed Images.- Some Properties of Acoustical Holograms.- Acknowledgment.- References.- 16 Ultrasonic Holography via the Ultrasonic Camera.- Acknowledgments.- References.- 17 Acoustical Filtering with Holographically Matched Spatial Filters.- Extending Spatial Filtering to Acoustic Waves.- Preliminary Experiments.- Results.- General Remarks.- References.- 18 Summary and Directions for FutureProgress.- 19 Supplementary Bibliography.
