Piezoelectric stress/strain intrusion detectors

Details Piezoelectric stress/strain intrusion detectors Piezoelectric stress/strain intrusion detectors

1975-10-09

1977-03-15

Budd, Mark O.

Electrical generator or motor structure

Educational or construction units or kits

310 85, 310 87, 340 10, 340 17R, H01L 4104

Patent

active

040126498

ABSTRACT:
A detector structure and array to be buried in a solid medium either singly or plurally at spaced intervals to detect intrusions such as footsteps upon the surface under which the detectors are buried. Each detector comprises a cup having a diaphragm at one end and a closure at the other end, piezoelectric transducer disc means in the cup and bonded to the diaphragm, the diaphragm being large enough in diameter to achieve good coupling to the medium in which it is buried, especially if it is a particulate medium such as ground soil. A cable joins the cup units, and sealing means are provided for the cup and cable entrance to seal against entry of moisture. Successive detector units may be coupled to the cable with reversed polarities to cancel out frontal disturbances such as seismic events.

REFERENCES:
patent: 3054982 (1962-09-01), Kieser
patent: 3094636 (1963-06-01), Gauld
patent: 3239696 (1966-03-01), Burkhalter et al.
patent: 3255431 (1966-06-01), Howatt
patent: 3284760 (1966-11-01), Maes
patent: 3286227 (1966-11-01), Aldrich
patent: 3336573 (1967-08-01), Gallaway et al.
patent: 3489994 (1970-01-01), Massa

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