Henry H. Kolm

Piezoelectric seismic sensor for intrusion detection

A seismic sensor for intrusion detection includes a base, a cantilever member of piezoelectric construction extending from the base, and a mass loading the end of the cantilever member remote from the base. The base defines a slot for receiving the end of the cantilever member, and holes, perpendicular to the slot, for receiving electrical conductors. These conductors are configured to orient the cantilever member at 45° relative to the horizontal, providing a sensitivity in both the X direction and the Y direction. A housing encloses the sensor, and another leg extends from the housing at the end remote from the base, enhancing the mechanical coupling between the sensor and the surface on which it is supported.