In-line stress/strain detector

Details In-line stress/strain detector In-line stress/strain detector

1975-02-06

1977-01-18

Wilbur, Maynard R.

Communications: electrical

Selective

Interrogation response

340258B, 340261, 340 38L, G01V 116

Patent

active

040042685

ABSTRACT:
A plurality of detector units oriented in line to form a linear array to detect intrusions such as footsteps upon the ground under which the array is buried, the coil connections and sometimes the magnet polarities of successively adjacent detector units in the array being reversed so as to cancel out disturbances arriving in a broad frontal manner and caused by spurious events, but to avoid cancellation of disturbances of a localized near-field nature, and the individual detector units comprising variable reluctance units especially constructed to provide high sensitivity, to be protected from hazards of their environment, and to provide elongated zones of sensitivity in a flexible construction.

REFERENCES:
patent: 2418953 (1947-04-01), Raitt
patent: 2906994 (1959-09-01), Pellillo
patent: 3375490 (1968-03-01), Stubblefield
patent: 3659257 (1972-04-01), Witzell
patent: 3689875 (1972-09-01), Kostelnicek
patent: 3754223 (1973-08-01), Shtrikman
patent: 3840846 (1974-10-01), Dick

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