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Practical Aspects of Acoustical Holography
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acoustical holo acoustical holograms acoustical holography Acoustical imaging amplitude angular aperture aperture axis cylinder appear Cylindrical Scanning diffracted direct reflection direct transmission distance between source electronically expression A.3 focal point focussed transducer Fourier Transform frequencies Gabor give rise Harwell holographic plane holographic system illustrated in Fig image obtained intensity patterns intensity plot Lamore laser line scan main tank material structure medical diagnostics multiplied non-destructive testing non-linear object plane object position object wavefront optical reproduction optical transparency output phase phase modulator photographic plate Plane Illuminating Beam plane wave Plenum Press point receiver produce propagating pulse Radar Type Systems radiating range gating real time system receiver is given receiving transducer recorded reference beam wavefront scanning plane scatter Seismology send transducer shown in Fig signal sonar sound Sound intensities source and receiver synchronism term trans transmit gate Ultrasonic images ultrasound unwanted modes usually viewed by means virtual image wavelength Worlton X-rays