Phase shift divided leaky cable sensor
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United States of America Patent
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-
Feb 19, 1991
Grant Date -
N/A
app pub date -
Sep 1, 1989
filing date -
Sep 27, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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