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This report presents a complete analytic theory of the acousto-electric storage correlator, and experimental applications which demonstrate its versatility as a signal processor. Within the storage correlator, externally applied signals interact with the potentials associated with an acoustic surface wave traveling on a piezoelectric substrate. A spatially varying charge pattern is thereby stored in a linear array of semiconductor diodes. Application of a later reading signal yields the convolution or correlation of the reading signal and the stored charge pattern. A number of modes of both storing the charge pattern and reading it have been reported. The theory provides analytic predictions of the device performance for most of these modes of operation and most reported device structures. Experimental confirmation of the theory is given. Particular attention is paid to the transient characteristics of p(+)n diodes. It is shown both theoretically and experimentally that their response is nearly equivalent to that of fast diodes (e.g., Schottky diodes) in this application. As a consequence, they may be charged quickly (in nanoseconds) and can retain their charge for long times (seconds).
This dedicated overview of optical compressive imaging addresses implementation aspects of the revolutionary theory of compressive sensing (CS) in the field of optical imaging and sensing. It overviews the technological opportunities and challenges involved in optical design and implementation, from basic theory to optical architectures and systems for compressive imaging in various spectral regimes, spectral and hyperspectral imaging, polarimetric sensing, three-dimensional imaging, super-resolution imaging, lens-free, on-chip microscopy, and phase sensing and retrieval. The reader will gain a complete introduction to theory, experiment, and practical use for reducing hardware, shortening image scanning time, and improving image resolution as well as other performance parameters. Optics practitioners and optical system designers, electrical and optical engineers, mathematicians, and signal processing professionals will all find the book a unique trove of information and practical guidance.
This book provides students, teachers, researchers and clinicians with a strong and established source of information on advanced optical technologies that show real promise of being translated to clinical use.