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