液体流量计原理：超声波流量计测量液体原理：当超声波束在液体中传播时，液体的流动将使传播时间产生微小变化，其传播时间的变化正比于液体的流速，其关系符合下面表达式： 其中 θ 为声束与液体流动方向的夹角M 为声束在液体的直线传播次数D 为管道内径Tup 为声束在
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