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Scanning seismic intrusion detection method and apparatusAn intrusion monitoring system includes an array of seismic sensors, such as geophones, arranged along a perimeter to be monitored for unauthorized intrusion as by surface movement or tunneling. Two wires lead from each sensor to a central monitoring station. The central monitoring station has three modes of operation. In a first mode of operation, the output of all of the seismic sensors is summed into a receiver for amplification and detection. When the amplitude of the summed signals exceeds a certain predetermined threshold value an alarm is sounded. In a second mode of operation, the individual output signals from the sensors are multiplexed into the receiver for sequentially interrogating each of the sensors.
Document ID
19830026001
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Lee, R. D. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
February 15, 1983
Subject Category
Instrumentation And Photography
Accession Number
83N34272
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,374,378|NASA-CASE-ARC-11317-1
Patent Application
US-PATENT-APPL-SN-229231

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