Vibration .28shaker.29 or inertia sensors Security alarm

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strain-sensor cable installed on chain-link/barbed-wire fence


these devices mounted on barriers , used detect attack on structure itself. technology relies on unstable mechanical configuration forms part of electrical circuit. when movement or vibration occurs, unstable portion of circuit moves , breaks current flow, produces alarm. technology of devices varies , can sensitive different levels of vibration. medium transmitting vibration must correctly selected specific sensor best suited different types of structures , configurations.


a rather new , unproven type of sensor uses piezo-electric components rather mechanical circuits, can tuned extremely sensitive vibration.



advantages: reliable sensors, low false alarm rate, , midpriced.
disadvantages: must fence-mounted. rather high price deters many customers, effectiveness offsets high price. piezo-electric sensors new technology unproven record opposed mechanical sensor in cases has field record in excess of 20 years.






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