| 摘要 |
<p>A shock sensor 10 for an intruder alarm system comprises a micro electro-mechanical system (MEMS) accelerometer 11 which detects acceleration forces applied to the sensor 10 to trigger an alarm condition when a pre-determined output from the accelerometer 11 is detected. The accelerometer 11 enables the sensor 10 to detect shock (as in existing shock sensors), or motion, or both motion and shock, thus the sensor is able to detect the movement of a door or window being opened, even if there is no shock associated therewith. The shock sensor 10 may be connected to an alarm panel 14 which may activate a warning device 16 when an alarm condition is detected. The sensor 10 may be programmable by an external device.</p> |
