By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)
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Extra resources for Acoustical Imaging: Visualization and Characterization
ACOUSTIC HOLOGRAMS OF A POINT OBJECT ON AXIS (a) ASTIGMATIC HOLOGRAM (b) CORRECTION ASPECT RATIO (1:2) HOLOGRAM Longitudinal Resolution (~z) _ '(_af )2 A (23) where >.. 3 mm, respectively. The focused line source and point receivers will determine the holographic resolutions in one direction. r l (24) Lateral Resolution (~y) ~ --2Ly where rl = flaw to hologram distance and Ly .. effective aperture length in the "y" direction. , perfect points). This, of course, is not true. Thus, as in any imaging system, the weakest link dominates.
Development of an Ultrasonic Analyzing System", EPRI Report NP606-1, December 1979. 3. Keating, P. , Acoustical Holography, Vol. 5, (edited by P. J. Green), Plenum Press, NY, 1973. 4. Collins, H. , "Various Holographic Scanning Configurations for Under-Sodium Viewing", AEC Research and Development Report (BNWL-1558), 1971. 5. Collins, H. , and Brenden, B. , Acoustical Ho1ograp~, Vol. 5, (edited by P. J. Green), Plenum Press, NY, 1973. 6. Collins, H. D. and Hildebrand, B. , Evaluation of Acoustical Holography for the Inspection of Pre~sure Vessel Sections, book, (Periodic Inspection of Pressure Vessels), Institution of Mechanical Engineers, 1972.
It has, however, one demerit that the direct acoustical coupling between the transmitter and the receiver must be excluded by an acoustical absorber placed between them, although the electrical coupling is easily kept away with the electrical shield. This may limit somewhat practical utility of this method. , poor axial resolution in the first type and necessity of placing an acoustical absorber in the second type. First, we made imaging placing the transmitter and receiver arrays, both of which are composed of 37 elements, on a line as in the first type, but using five different frequencies.
Acoustical Imaging: Visualization and Characterization by B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)