22 pages matching H. M. A. El-Sum in this book
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A. F. Metherell acoustic ﬁeld acoustical hologram acoustical holography acoustical imaging ampliﬁer amplitude angle angular resolution aperture array camera coherent color conic conjugate images crystal deﬁned detection detector diffraction display eikonal equation electronic elements equation experimental ﬁgure ﬁlm ﬁlter ﬁnd ﬁrst focal focused Fraunhofer function grating-like acoustical hologram H. M. A. El-Sum higher-order images holo hologram of Fig hologram plane illuminated images reconstructed infrasonic infrasound intensity laser lens light limited linear liquid surface method microphone modiﬁed modulation noise object wave obtained optical reconstruction output pattern phase phase modulation phase-only hologram photographic piezoelectric plate problems propagation pulse range raster scan ray optics reconstructed image recording reference beam reference wave reﬂecting resolution scanning scanning direction shown in Fig signal signiﬁcant simulated slit sonar sound ﬁeld sound wave spatial frequency target technique temporal reference acoustical transducer ultrasonic ultrasound velocity waveﬁeld wavefront wavelength