Acoustic Imaging with Electronic Circuits |
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Page 1
... object plane to a P3 a P2 P1 object plane 7 reception plane b 1 P3 P2 P1 object plane 7 reception plane ' FIG . 1.1-1 . Wavefronts generated at three points P1 , P2 , and P3 in the object plane and received at many points in the ...
... object plane to a P3 a P2 P1 object plane 7 reception plane b 1 P3 P2 P1 object plane 7 reception plane ' FIG . 1.1-1 . Wavefronts generated at three points P1 , P2 , and P3 in the object plane and received at many points in the ...
Page 2
... object plane produces their sum in the reception plane ; the inverse of this transformation reproduces the original wavefronts , which we call the image of the object plane . The various methods of image generation differ primarily in ...
... object plane produces their sum in the reception plane ; the inverse of this transformation reproduces the original wavefronts , which we call the image of the object plane . The various methods of image generation differ primarily in ...
Page 11
... object plane . There are , of course , many more than 16 × 16 scattering points in the object plane . However , since we measure only 16 × 16 sound pressures and know that there is a linear relationship between the sound pressures in ...
... object plane . There are , of course , many more than 16 × 16 scattering points in the object plane . However , since we measure only 16 × 16 sound pressures and know that there is a linear relationship between the sound pressures in ...
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 analog circuits analog-to-digital converter Ax₁ bandwidth beam forming cartesian coordinates circuit of Fig d₁₁ delay circuits denoted depth of field diffraction pattern digital circuits display Doppler dynamic range electronic circuits equal equipment fast Fourier transform filters focus focusing distance four voltages Fourier series Hence holography hydrophone array implementation input terminals insonification lens light-emitting diode multiplexing multipliers object plane obtain operational amplifier optical output terminals output voltages phase shifts printed circuit cards processing produce projector pulses radiation reception plane resistors resolution resolvable points samples scattering points sensors shift register shown in Fig shows signal signal-to-noise ratio sinusoidal function sinusoidal waves sound waves spread spectrum ẞx switches synthetic aperture tan² target two-dimensional values viewing angle wavefront wavelength x₁ zero