Proceedings PaperCoherent Imaging Devices : Extended Capability For 1-D Multichannel Processing
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Long duration signals are recorded as a cohe-rent image in a TV-type raster format on 300 lines, each line being a time,window of duration 1 s with time- bandwidth capacity of 342. A holographic fil-ter produces 3 adjacent images with vertical shifts of 1 line, yielding continuous lines 3 times longer (3 s width) with a sliding time-window stepped by 1 s. An optical multichannel 1 D Fourier transform then performs a time-frequency representation, with a frequency resolution increased by a factor 3. Such a system makes the geometry of coherent light valves more convenient for the multichannel processing of signal with large BT products, for instance in passive Sonar.