Self monitoring intruder detecting system of noise-cancelling vibration detectors
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United States of America Patent
Stats
-
Aug 20, 1985
Grant Date -
N/A
app pub date -
Aug 2, 1982
filing date -
Aug 2, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ferrite transformer is coupled between a two-wire array of geophones or other suitable vibration detectors (such as hydrophones). An oscillator is coupled across the secondary of the transformer in order to provide a carrier on which the output of the array may be modulated. A low level leakage current appears in the array so that a continuity test may be conducted to monitor the line for opens and shorts and to detect the operativeness of system components. The modulated output of the transformer is connected to a signal processing system.
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