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    • 4. 发明申请
    • IMPROVED SENSING APPARATUS AND METHOD
    • 改进的感应装置和方法
    • WO2004102499A1
    • 2004-11-25
    • PCT/AU2004/000639
    • 2004-05-14
    • VISION FIRE & SECURITY PTY LTDAJAY, KemalCAPRIHAN, Arjun, VinooREZNY, Michael
    • AJAY, KemalCAPRIHAN, Arjun, VinooREZNY, Michael
    • G08B17/10
    • G01F1/74G01F1/66G01F1/667G01N1/2205G01N1/2273G01N1/26G01N29/024G01N2015/0046G01N2015/1486G01N2291/0217G01N2291/02408G01N2291/02836G08B17/10G08B17/113
    • The present invention relates to the field of sensing apparatus (10) in detecting particles in air sampled from a number of locations. In one aspect the present invention provides for the determination of the time of flight of a signal transmitted between a transmitter (42, 44) and a receiver (44, 42), comprising: transmitting a first signal comprising at least one characteristic waveform feature; transmitting a second signal comprising at least one characteristic waveform feature and a waveform modification introduced at a predetermined point in time of the duration of the second signal; receiving said first and second transmitted signals; determining a point of diversion between corresponding characteristic waveform features of the first and second received signals comprising super positioning said first and second received signals such that said point of diversion corresponds to an arrival time of the introduced waveform feature modification at the receiver. In a preferred embodiment, the invention provides an accurate time of flight determination of ultrasonic signals in a flow sensor (24) adapted for a smoke detector system (10).
    • 本发明涉及检测从多个位置取样的空气中的颗粒的感测装置(10)的领域。 在一个方面,本发明提供确定在发射机(42,44)和接收机(44,42)之间传输的信号的飞行时间,包括:发送包括至少一个特征波形特征的第一信号; 发送包括在所述第二信号的持续时间的预定时间点引入的至少一个特征波形特征和波形修改的第二信号; 接收所述第一和第二传输信号; 确定第一和第二接收信号的相应特征波形特征之间的转移点,包括超定位所述第一和第二接收信号,使得所述转向点对应于在接收机处引入的波形特征修改的到达时间。 在优选实施例中,本发明提供了适于烟雾探测器系统(10)的流量传感器(24)中超声信号的精确时间确定时间。