| 摘要 |
FIELD: alarm systems applicable in detection of burglar intrusion into object under guard. SUBSTANCE: ultrasonic burglar alarm device has detecting devices in form of amplitude and phase detectors instead of multipliers. In this case, performance in terms of error probability is fully preserved due to determination of movement direction, and manufacture and tuning of the device are simplified. EFFECT: simplified manufacture and cut down manufacture costs with preserved high sensitivity to moving objects and low noise sensitivity. |
