Acoustical Imaging: Visualization and Characterization by B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)

By B. P. Hildebrand, S. R. Doctor (auth.), Keith Y. Wang (eds.)

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In the experiments, sinusoidal wave of short duration is transmitted. Therefore, the object region relevant to the measured hologram is limited near the receiver array. However, the object region is usually so large that some means of suppressing the grating lobe noise is necessary. We adopt nonuniform1y spaced frequency series. Frequencies fk (k = 1,2, ... ,K) and their amplitude weights AFk are related with the continuous distribution AF(f) by AFk =JVk AF(f)df , vk-1 k=1,2, ... ,K, (13) where vk=(fk+fkH)/2, vo=(1-o)fc ' VK=(l+o)f c ' From these equations, either amplitude-weighted and uniformly-spaced frequency series or uniformly-weighted but nonuniform1y-spaced series can be designed.

Harrington of Battelle, and G. J. Dau and K. Stahlkopf of EPRI. Ogura Departments of Electrical Engineering and Electronics, Kyoto Institute of Technology Matsugasaki, Sakyo-ku, Kyoto 606, Japan ABSTRACT A multi-frequency holographic imaging method has been developed, which is an advanced application of the hologram-matrix imaging method suggested and developed by the authors. This new method is based on the idea that axial resolution as well as transverse one can be obtained by properly synthesizing transversely focused beams of different frequencies.

C) Gray scale image when transversely aligned, (d) its front perspective view. 35 IMAGING BY MEANS OF MULTI-FREQUENCY HOLOGRAM It is shown that the axial resolution by the multi-frequency synthesis is very satisfactory. On the contrary, the image of the transversely aligned point-targets is of poor quality, although the nine points are resolved. A plausible reason will be frequency dependence and spatial nonuniformity of the element factor of the transducer array. Circle-shaped point-targets were imaged.

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