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AssigneeCalifornia Institute of Technology
InventorsPaul E. Dimotakis, Daniel B. Lang
Estimating the term…
A signal responsive burst period timer and counter is provided for laser Doppler velocimetry, and the like, by bandpass filtering a signal burst and testing the filtered signal for exceeding a first level (V.sub.O -V.sub.L) and a second level (V.sub.O +V.sub.L), and subsequently crossing a reference level (V.sub.O) from the second level, and in that order, to qualify each cycle of the signal burst for timing and counting. A timing system checks the reference crossing of every qualified cycle, in accordance with the level crossing logic criteria described above, to determine that it occurs within a prescribed time interval as measured from the previous qualified reference crossing. When the sequence ends, either because a predetermined number of qualified cycles have been received or because the signal fails to meet one of the amplitude or time criteria described above, the burst period counter stops, the data is read out and the counter resets itself to process the next burst.
A method of detecting and qualifying a first and each successive cycle of a signal as to a criterion relating to voltage amplitude for accurate timing of the period of each succeeding cycle, comprising the steps of
Apparatus for detecting and qualifying each cycle of a signal as to voltage amplitude for accurate timing of the period of each succeeding cycle also qualified as to amplitude, comprising
Apparatus for detecting and qualifying each cycle of an oscillatory signal containing only a number of cycles in a burst comprising
A method for qualifying each cycle of a signal comprising the steps of
Apparatus for qualifying each cycle of an oscillatory signal comprising,
Dependencies are inferred from the claim text.