Acoustic emission intrusion detector

Details Acoustic emission intrusion detector Acoustic emission intrusion detector

1978-08-09

1980-04-01

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307117, 324 78R, 340550, G08B 1322

Patent

active

041964233

ABSTRACT:
An intrusion detector is provided for detecting a forcible entry into a secured structure while minimizing false alarms. The detector uses a piezoelectric crystal transducer to sense acoustic emissions. The transducer output is amplified by a selectable gain amplifier to control the sensitivity. The rectified output of the amplifier is applied to a Schmitt trigger circuit having a preselected threshold level to provide amplitude discrimination. Timing circuitry is provided which is activated by successive pulses from the Schmitt trigger which lie within a selected time frame for frequency discrimination. Detected signals having proper amplitude and frequency trigger an alarm within the first complete cycle time of a detected acoustical disturbance signal.

REFERENCES:
patent: 3717864 (1973-02-01), Cook et al.
patent: 3733598 (1973-05-01), Kato
patent: 3805260 (1974-04-01), Barowitz
patent: 3922663 (1975-11-01), Lubke et al.
patent: 4096474 (1978-06-01), Greer et al.
patent: 4099168 (1978-07-01), Kedjierski et al.
patent: 4134109 (1979-01-01), McCormick et al.
Wells Fargo Alarm Services, "Cu-2 Vibration Detection System", Washington, D.C.

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