Abstract: A vibration sensor is used in conjunction with perimeter security systems. The sensor is comprised of two conductive spherical elements each resting on a pair of parallel conductive arcs. A plurality of sensors are attached to mounting device and placed at spaced intervals on a security fence. The sensors are used to detect persons who attempt to cut, climb, lift, or contact the security fence.

Abstract: A taut wire sensor includes an actuator that is movably coupled to a housing. The actuator includes a taut wire terminal. The actuator has two contacts that are maintained in a spaced apart orientation by the mating of parts, which are held in place by a spring element. The actuator deforms when force is applied to the taut wire terminal of the sensor. When the actuator deform, an electrical connection is made between the two contacts to produce an alarm indication by the sensor. The orientation of the actuator is maintained by the mating of parts which are also held by a spring element. One of the contacts in the actuator is a flexible contact pin that is adapted to bend when high force is applied to the taut wire terminal. The sensor housing also includes a movement limiter that overcomes a weakness in prior sensors which employ compensating flowable materials to adjust sensor position.