Security system with plural sensors connected in parallel across

Details Security system with plural sensors connected in parallel across Security system with plural sensors connected in parallel across

1973-12-17

1976-06-29

Moskowitz, Nelson

Communications: electrical

Systems

Call station

340261, 340409, 340 155MC, G08B 1300

Patent

active

039672590

ABSTRACT:
A security system for seismicly detecting intrusion into an enclosure. A plurality of sensor units are electrically connected in parallel across a two wire transmission line. The sensing elements are coupled to the line through high output impedence amplifiers to negate any signal attenuating shunt paths. The readout end of the line is closed through a characteristic impedence resistor to avoid signal reflections, and the remote end of the line is closed through relatively high resistors to avoid sensor signal absorption or attenuation.

REFERENCES:
patent: 3109165 (1963-10-01), Bagno
patent: 3258762 (1966-06-01), Donner
patent: 3260991 (1966-07-01), Laakmann
patent: 3579220 (1971-05-01), Stevenson
patent: 3585581 (1971-06-01), Aune et al.
patent: 3652979 (1972-03-01), Angelle
patent: 3818471 (1974-06-01), Kurschner

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