Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-07-28
1982-05-04
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
333237, 393 5PD, 393853, G05B 1318
Patent
active
043284876
ABSTRACT:
An intrusion detection system includes a transmitter of wave energy at one end of a transmission line or coaxial cable, for example, and a receiver connected directly to the transmission line or a cable at the other end together with a series or discrete antennas uniformly spaced along the transmission line and relatively loosely coupled thereto. The coupling between the antennas and the transmission line or coaxial cable is determined to be of an optimum value and in such a system the sensitivity to an intrusion is the same along the length of the coaxial cable or transmission line for the same distance from the transmission line.
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"Guidar", Computing Devices Company, Control Data.
Cates Charles E.
Myer Victor
Roediger Joseph H.
Southwest Microwave, Inc.
Swann III Glen R.
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