Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-01-30
1980-03-18
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
310332, 310338, 310345, 310357, 340665, G08B 1300, H01L 4110, H04R 1700
Patent
active
041941942
ABSTRACT:
An intrusion sensor uses thin film piezoelectric transducers to sense nea mechanical vibrations. A hose-like sheath contains a pair of insulating strips which carry conductive leaves on their outer surfaces. A series of longitudinally arranged segments of a thin film piezoelectric material are coupled to the leaves to provide signals representative of impinging mechanical vibrations. Since adjacent ones of the thin film segments are alternately polarized, signals are created only when the vibrations are nearby. Greater sensitivity to nearby vibrations is assured when each of the segments is fabricated from several layers of the thin film piezoelectric material.
REFERENCES:
patent: 3433982 (1969-03-01), Kaname et al.
patent: 3798474 (1974-03-01), Cassand et al.
patent: 3806908 (1974-04-01), Bound et al.
patent: 3946398 (1976-03-01), Kyser et al.
Caldwell Sr. John W.
Johnston Ervin F.
Nowicki Joseph E.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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