Dual velocity leaky cable intrusion detector sensor

Details Dual velocity leaky cable intrusion detector sensor Dual velocity leaky cable intrusion detector sensor

1984-10-02

1986-09-16

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

333237, 343 5PD, G08B 1318

Patent

active

046125361

ABSTRACT:
A sensor for use in a leaky cable intrusion system which is comprised of a pair of parallel buried coaxial cables, each of which has a velocity of propagation factor different from the other. This results in different sensitivity characteristics with length, resulting in a combined sensitivity which has markedly reduced amplitude variation over cables having similar velocities of propagation. It also makes feasible a system having ungraded cables in which the position of intrusion in the field set up by the sensor can be determined.

REFERENCES:
patent: 4091367 (1978-05-01), Harman
patent: 4213123 (1980-07-01), Poirier
patent: 4415885 (1983-11-01), Mongeon
patent: 4562428 (1985-12-01), Harman et al.
Harman, R. K. et al., "Advancements in Leaky Cable Technology for Intrusion Detection" Carnahan Conf. on Security Tech., U. of Kentucky, May 12-14, 1982.

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