| 摘要 |
A cabinet alarm system is adapted to distinguish the sounds and forces of a genuine malicious attack on a cabinet from normal environmental forces and sounds to which the cabinet is routinely subjected. The alarm system comprises a timer; and at least a first and second sensor, each sensor being adapted to sense different physical inputs; and a means to trigger an alert in the successive events of: a first sensed input exceeding a first input threshold during a first time period, and after a predetermined time interval subsequent to the first time period, a second sensed input exceeds a second input threshold. The first sensor may be an acoustic noise sensor. The second sensor may be a conducted noise sensor or a thermal rate sensor. A third distortion force strain sensor may be included in the system. The acoustic noise sensor is suited to detect noise produced by a rotary grinder, a rotary cutter, and a cutting torch. The alert may be an audible or visual alarm at the cabinet itself. Alternatively, the alert may be communicated to a remote device. |
