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    • 4. 发明授权
    • Pool alarm
    • 游泳池报警
    • US5903218A
    • 1999-05-11
    • US131767
    • 1998-08-10
    • Alan Nelson
    • Alan Nelson
    • G08B21/08G08B23/00
    • G08B21/084
    • A wave motion detector system for a swimming pool includes a transducer responsive to positive and negative pressure changes in swimming pool water and operative to generate corresponding electrical signals. Comparators are responsive to the electrical signals, and operative to generate a crest signal while the positive pressure exceeds a predetermined positive threshold level, and a trough signal while the negative pressure exceeds a predetermined negative threshold level. A band pass filter prevents electrical signals having a frequency greater than a predetermined upper frequency, and lower than a predetermined lower frequency from passing from the transducer to the comparators. A pulse width discriminator is responsive to the crest signal and the trough signal and is operative to generate a qualified crest signal if the crest signal remains active for a first predetermined time interval, and a qualified trough signal if the trough signal remains active for a second predetermined time interval. A counter circuit, responsive to the qualified crest signal and the qualified trough signal, determines a count value which is equal to the number of times the qualified trough signal and the qualified crest signal occur during a counting time interval. A processing circuit includes alarm condition detection circuitry responsive to the count value, and operative to generate an alarm signal if the count value is greater than or equal to a predetermined alarm count value. Annunciator means, responsive to the alarm signal, is operative to indicate an alarm condition if the alarm signal is generated.
    • 用于游泳池的波浪运动检测器系统包括响应于游泳池水中的正压力和负压变化的换能器,并且用于产生相应的电信号。 比较器响应于电信号,并且在正压力超过预定的正阈值电平时产生峰值信号,并且在负压超过预定的负阈值电平时产生谷信号。 带通滤波器防止具有大于预定上限频率的频率并且低于从传感器传递到比较器的预定较低频率的电信号。 脉冲宽度鉴别器响应波峰信号和波谷信号,并且如果波峰信号在第一预定时间间隔内保持有效,并且如果波谷信号保持有效的第二预定时间间隔,则可操作以产生合格的波峰信号 预定时间间隔。 响应于合格的峰值信号和合格的槽信号的计数器电路确定等于合格的槽信号和合格的峰值信号在计数时间间隔期间发生的次数的计数值。 处理电路包括响应于计数值的报警条件检测电路,并且如果计数值大于或等于预定的报警计数值则可操作以产生报警信号。 指示器意味着响应于报警信号,如果产生报警信号,则可以指示报警状态。