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    • 1. 发明授权
    • Fault monitoring event detection device
    • 故障监控事件检测装置
    • US5796353A
    • 1998-08-18
    • US727436
    • 1997-03-13
    • Matthew Whitehead
    • Matthew Whitehead
    • G08B29/18G08C19/16
    • G08B29/183
    • A combined technology event detection device for detection of an event such as movement and/or body temperature, such as an intrusion detection device. The event detection device includes: a passive infrared (PIR) sensor to generate a first output signal in response to detection of an event; a microwave sensor to generate a second output signal in response to detection of an event; a logic device to receive the first and second output signals, which activates an alarm in response thereto; and a fault monitoring system. The fault monitoring system includes: a first counter to store the number of first output signals received from the PIR sensor; a second counter to store the number of second output signals received from the microwave sensor; a signal detector to detect an output signal from either the PIR sensor or the microwave sensor, increment the counter associated with the sensor generating the output signal in response thereto, and re-set the counter not associated with the sensor generating the output signal to a base level; and a logic device which generates an output signal indicative of a fault condition in the event detection device when the number of output signals stored in a counter exceeds a predetermined threshold.
    • PCT No.PCT / EP95 / 01331 Sec。 371日期1997年3月13日 102(e)1997年3月13日PCT提交1995年4月11日PCT公布。 WO95 / 28692 PCT出版物 日期1995年10月26日用于检测移动和/或体温等事件(例如入侵检测装置)的组合技术事件检测装置。 所述事件检测装置包括:被动红外(PIR)传感器,用于响应于事件的检测而产生第一输出信号; 微波传感器,用于响应于事件的检测而产生第二输出信号; 接收第一和第二输出信号的逻辑装置,其响应于此触发报警; 和故障监控系统。 所述故障监测系统包括:第一计数器,用于存储从所述PIR传感器接收的第一输出信号的数量; 第二计数器,用于存储从微波传感器接收的第二输出信号的数量; 用于检测来自PIR传感器或微波传感器的输出信号的信号检测器,响应于该传感器或微波传感器增加与传感器相关联的计数器产生输出信号,并且重新设置与生成输出信号的传感器不相关的计数器 基础水平 以及当存储在计数器中的输出信号的数量超过预定阈值时,生成表示事件检测装置中的故障状况的输出信号的逻辑装置。