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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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Thus, in the direction of scan, the resolution is the same as for the standard pulse-echo method, but in the array direction only half as good. However, for most applications, this is not a problem since resolution is still very good. ). This is certainly adequate for most applications. CONCLUSION During the course of this program the system evolved from one using standard holographic techniques to one specifically tailored to the linear array. The evolution was forced, and guided by practical problems encountered in trying to use the array in ways not wholly suitable.

Tomography, to begin with. FREQUENCY-SPREAD HOLOGRAPHIC IMAGING As shown in the next section, frequency series, receiver-element positions and amplitude weights applied to the receiver elements and the frequency components are designed from continuous aperture and frequency distributions. Therefore, at first, the continuous distributions should be determined to satisfy the required resolution and SiN ratio from an investigation of the point-spread function. l, is (1) where rand t are x-coordinates of the receiver aperture and the transmitter, respectively, f frequency at which the hologram is made, Rarf and Tatf distances in terms of wavelength from the point target to the receiver and the transmitter, respectively, GR(R) and GT(T) decay factors due to wave divergence and absorption by the medium.

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.

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