Sensol’s perimeter fence sensor systems employ multiple vibration sensors and are a major technological improvement on the conventional acoustic cable installations. The sensors can be spaced up to 20 metres apart and communicate by wire or wireless, and have been built into both metallic and also smaller plastic housings (plastic 30mm x 50mm x 80mm).
If required, a miniature camera can be included in each sensor so that when one sensor generates an alarm the sensor next in line takes a picture of the area around the alarming sensor and transmits it to the control centre.
A geophone with spike can be screwed in the fence sensor and placed where there are openings under a fence for drains or waterways to provide continuity for the perimeter system.
Although the communications used are based on low power spread spectrum technologies, wire communication is also offered with the advantage of resistance to jamming (some Government departments insist on this approach).
Wireless communications have the advantages of rapid deployment and redeployment, and greater resistance to damage in that the loss of a sensor does not affect other sensors. For wireless communications solar panels can be added to make the system deployed self-sufficient and minimise logistic support with no battery charges.
Figure 1 - Fence Sensors with solar panel.
Left to right:
