Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-12-09
1995-09-05
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1300
Patent
active
054482224
ABSTRACT:
A transducer cable includes an inner conductor, an outer conductor, and dielectric between the inner conductor and the outer conductor. A longitudinal passage and a sense wire loosely disposed therein extend through the dielectric. Movement, (e.g., intruder-caused vibration) of the transducer cable results in movement of the sense wire relative to the outer conductor, causing corresponding changes in characteristic impedance of the sense wire. A carrier signal transmitted down the inner conductor produces an electromagnetic field that couples energy to the sense wire. The change in characteristic impedance causes reflection of some of the coupled energy, which produces a corresponding signal that is sensed by a receiver circuitry. The receiver circuitry produces a signal indicating the occurrence of the intruder-caused vibration. The receiver circuitry includes a system that digitizes the received signals at successive times that correspond to successive sections of the cable, performs digital filtering to eliminate a cable profile or clutter response, and produces target response values for sections of the cable that undergo changes in characteristic impedance. Target responses in several adjoining sections are interpolated to precisely locate the intrusion activity causing the vibrations.
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Lee Benjamin C.
Peng John K.
Southwest Microwave, Inc.
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