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本数据采集接口电路的作用,是将相关流量仪的正弦波超声传感器输出的两路随机梯形波,转化为随机的越零点脉冲序列,送到8031微处理机的输入通道口。以完成越零点数据采集的功能。一、相关流量仪对数据采集接口电路的要求相关流量仪采用越零点相关算法,该算法实质上是极性相关的一种改进。极性相关所需的数据仅是信号的极性,与信号的瞬时幅值无关,故本接口电路不需 A/D 转换,仅需把
The role of the data acquisition interface circuit is to convert the two random trapezoidal waves output by the sine wave ultrasonic sensor of the relevant flow meter into a random zero-crossing pulse sequence and send it to the input port of the 8031 microprocessor. To complete the function of data acquisition more than zero. First, the relevant flow meter on the data acquisition interface circuit requirements Related to the flow meter using zero-point correlation algorithm, the algorithm is essentially an improvement of the polarity. Polarity related data required is only the polarity of the signal, and the instantaneous amplitude of the signal has nothing to do, so the interface circuit without A / D conversion,