| 摘要 |
<p>A safe (20) for an ATM comprises a layer of piezoelectric or pyroelectric material, and contains electrical circuitry (24) to sense a mechanical or thermal attack on the safe. The safe also contains response means such as a silent alarm (26) connected by radio to an external security centre; an audible alarm (28) and a dye spray (30). A neural network (22) is connected to the circuitry, and is trained to distinguish between different types of attack on the ATM (e.g. a casual kick or several hammer blows) and to activate the appropriate response means. Preferably said layer is polyvinylidene fluoride, which has both piezoelectric and pyroelectric properties. <IMAGE></p> |
