Intrusion detection systems

Details Intrusion detection systems Intrusion detection systems

1974-09-03

1976-06-01

Trafton, David L.

Communications: electrical

Systems

Call station

340 16R, 340261, G08B 1300

Patent

active

039613208

ABSTRACT:
A system for sensing seismic and magnetic disturbances, comprising a segmented transducer, such as a line sensor, and electronic circuitry for processing the signals developed by the segmented transducer. The segmented transducer comprises sets of windings wrapped around a ferromagnetic core. Currents are induced in the transducer windings by magnetic field disturbances caused by external ferrous objects. Electronic signal processing circuitry associated with the transducer extracts information from the induced seismic and magnetic signals and activates an alarm if the information meets predetermined criteria. Important criteria used include whether the seismic signals are impulsive, whether the magnetic or stress disturbances are localized, and whether specific thresholds of magnetic and stress activity are reached.

REFERENCES:
patent: 2435996 (1948-02-01), Baird
patent: 3109165 (1963-10-01), Bagno
patent: 3490024 (1970-01-01), Sherrill et al.
patent: 3573817 (1971-04-01), Akers
patent: 3818471 (1974-06-01), Kurschner
patent: 3846790 (1974-11-01), Erdmann et al.

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