Communications: electrical – Selective – Having indication or alarm
Patent
1971-11-05
1976-09-07
Farley, Richard A.
Communications: electrical
Selective
Having indication or alarm
340 16P, G01S 380
Patent
active
039797120
ABSTRACT:
An acoustic detection system comprising two arrays of omnidirectional sensors or hydrophones wherein the sensors in each array are disposed along a curved line, such as an arc of a cylindrical surface. Accordingly an acoustic signal or wavefront propagating along any vector within the arc is registered by the respective sensors as phase lags determined by the locations thereof. The respective sensor output signals are each connected to a preselected electrical delay circuit such that the registered phase lags are further increased. The delayed sensor signals are then summed for each array, forming two directional beams and the signal sum for each array is then connected to identical narrow bandpass filters. The output of each filter is fed to a hard limiter, then to a differentiator and the output signals of the differentiators control a bistable flip-flop producing a pulse train where the width of each pulse corresponds to the phase lag difference between the beam signals. The pulse widths are then sorted into discrete bins of phase in a coincidence processor and read out when any one bin registers a number of pulses exceeding a predetermined number.
REFERENCES:
patent: 3296581 (1967-01-01), Warner
Moore, "Digital Phase Angle Meter Control," p. 35, IBM Tech. Disclosure Betin, vol. 3, No. 2, July 1960.
Ettenhofer Kurt L.
Harris John L.
Thomas Richard L.
Farley Richard A.
Hansen Henry
Sciascia R. S.
The United States of America as represented by the Secretary of
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