Acoustic Imaging with Electronic Circuits |
Contents
Introduction | 1 |
Image Generation by Linear Transformations | 18 |
Implementation of the Fourier Transform | 41 |
Copyright | |
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16 hydrophones A₁ according to Eq according to Fig acoustic imaging amplitude analog circuits analog-to-digital converter Ax₁ bandwidth beam forming cartesian coordinates circuit of Fig d₁₁ delay circuits denoted diffraction pattern digital circuits electronic circuits equal equipment fast Fourier transform filters four voltages Fourier series Fourier transform circuit Hence Hologr holography hydrophone array implementation input terminals input voltages insonification inverse transform light-emitting diode linear microphones multipliers object plane obtain operational amplifiers optical output terminals output voltages printed circuit cards processing produce projector pulse q 0 q radiation ratio reception plane resistors resolution resolvable points scattering points sensors shift register shown in Fig shows sidelobe signal signal-to-noise ratio sinusoidal function sinusoidal waves sonar sound waves spread spectrum ẞx switches synthetic aperture t₁ Table target two-dimensional ultrasonic values wavefront wavelength x₁ zero