Patent
Pre-intrusion detection and alarm system
William E. Wagner,Ivan Zachev +1 more
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TLDR
In this article, a self-contained pre-intrusion detection and alarm system for doors and other closures, the system including an rf oscillator circuit incorporating a tank circuit which includes an antenna.Abstract:
A self-contained pre-intrusion detection and alarm system for doors and other closures, the system including an rf oscillator circuit incorporating a tank circuit which includes an antenna. The system also includes a detection and processing circuit effective to detect and amplify a change in the voltage in the rf oscillator circuit caused by a change in the antenna to ground capacitance; an audio oscillator circuit; time delay circuitry connected between the detecting and processing circuit and the audio oscillator circuit and controlling the energization of the audio oscillator circuit; and an alarm electrically connected to and controlled by the audio oscillator circuit for alerting occupants of potential danger of intrusion and also deterring potential intruders from continuing their activities toward intrusion.read more
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References
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Patent
Capacitor detector device
TL;DR: In this article, a capacitor detector device for detecting a change of capacitance in a protected zone, which comprises an antenna element adapted to be mounted in spaced relationship with a grounded element to define the protected zone between the elements and having a nominal capacitance there between them, is presented.
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Stanley I. Mason,John E. Pfeifer +1 more
TL;DR: In this article, an intrusion alarm is encased within a housing hung from a doorknob by a conductive strap which makes electrical contact with the apparatus, and a monitoring circuit within the housing is connected to the hanging strap for sensing capacitance changes corresponding to touching of the exterior portion of the dooornob apparatus by a would-be intruder.
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TL;DR: In this article, an intrusion detection system is described, which includes a capacitance having an active field, the coupling increases substantially when an intruder is related by conduction with a door handle.