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2. 发明授权

US4247848A Fire detector with a monitor circuit 失效
标题翻译：火灾探测器带监视器电路
公开(公告)号：US4247848A
公开(公告)日：1981-01-27
申请号：US9446
申请日：1979-02-05
申请人： Hiroyuki Kitta , Yukio Yamauchi
发明人： Hiroyuki Kitta , Yukio Yamauchi
IPC分类号： G01N27/04 , G08B17/00 , G08B17/06 , G08B17/10 , G08B29/00 , G08B29/04
CPC分类号： G08B29/043 , G08B17/06 , G08B17/10
摘要： In response to oscillator output pulses, a sample pulse generator supplies sample pulses to a fire sensor. In response to the sample pulses, the fire sensor produces a fire sensor signal. A judging circuit receives the fire sensor signals and, if they exceed a predetermined level, produces a judging pulse having a longer pulse duration than the oscillator pulses. This judging pulse is used to trigger an alarm signal. A monitor circuit consists of an AND gate and an OR gate. The AND gate receives as inputs the oscillator pulses and the judging pulses. The OR gate receives as inputs the output of the AND gate and the sample pulses. The output of the OR gate constitutes a monitor pulse that allows the simultaneous monitoring of three conditions, as follows:(1) Lack of a monitor pulse indicates equipment failure.(2) A monitor pulse with the same waveform as the sample pulse indicates normal operation (i.e., the oscillator and sample pulse generator are working but no judging pulse is being produced--no fire is detected).(3) A monitor pulse with the same waveform as the oscillator output pulses indicates a fire has been detected (i.e., a judging pulse is present and the oscillator is functioning).
摘要翻译：响应于振荡器输出脉冲，采样脉冲发生器向火灾传感器提供采样脉冲。响应于采样脉冲，火灾传感器产生火灾传感器信号。判断电路接收火灾传感器信号，并且如果它们超过预定电平，则产生具有比振荡器脉冲更长的脉冲持续时间的判断脉冲。该判断脉冲用于触发报警信号。监视电路由与门和或门组成。与门接收振荡器脉冲和判断脉冲作为输入。或门接收与门和采样脉冲的输出作为输入。 OR门的输出构成监视脉冲，允许同时监视三个条件，如下所示：（1）缺少监视脉冲表示设备故障。（2）具有与采样脉冲相同波形的监视脉冲表示正常操作（即，振荡器和采样脉冲发生器正在工作，但是不产生判断脉冲 - 没有检测到火灾）。（3）具有与振荡器输出脉冲相同波形的监视脉冲表示已经检测到火灾（即，存在判断脉冲并且振荡器正在起作用）。

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