Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-09-01
1991-02-19
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340554, 367 93, 367 94, G08B 1318
Patent
active
049947893
ABSTRACT:
A continuous wave (CW) leaky cable sensor for an intrusion detector uses a pair of elongated parallel cables, one for establishing an RF field and the other for receiving the field. A modulator is connected at an intermediate location of the receiving (or transmitting) cable, subdividing a detection zone into detection regions on each side of the modulator. The modulator selectively modifies a signal received by a portion of the receiving cable connected to its input. By processing the signal at the output of the receiving cable, the detection region for either side of the modulator in which an intrusion has occurred can be determined. The resolution of a CW sensor is thus increased at low cost. Multiple modulators can be used at spaced locations increasing the number of detection regions, and thus the resolution.
REFERENCES:
patent: 3947834 (1976-03-01), Gershberg et al.
patent: 4091367 (1978-05-01), Harman
patent: 4213123 (1980-07-01), Poirier
patent: 4612536 (1986-09-01), Harman
patent: 4887069 (1989-12-01), Maki et al.
Senstar Corporation
Swann III Glen R.
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