求翻译：流体流经传感器壳体，由于叶轮的叶片与流向有一定的角度，流体的冲力使叶片具有转动力矩，克服摩擦力矩和流体阻力之后叶片旋转，在力矩平衡后转速稳定，在一定的条件下，转速与流速成正比，由于叶片有导磁性，它处于信号检测器（由永久磁钢和线圈组成）的磁场中，旋转的叶片切割磁力线，周期性的改变着线圈的磁通量，从而使线圈两端感应出电 　　脉冲信号，此信号经过放大器的放大整形，形成有一定幅度的连续的矩形脉冲波，可远传至显示仪表，显示出流体的瞬时流量和累计量。在一定的流量范围内，脉冲频率f与流经传感器的流体的瞬时流量Q成正比。是什么意思？

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Fluid flow through the sensor housing and impeller vanes and direction of the flow of a fluid, the angle of the thrust to turn leaf has torque to overcome friction torque and fluid resistance to leaf after torque balance speed stability, under certain conditions, speed is proportional to velocity, t

Fluid flows through sensor shell body, due to impeller of leaves and flows has must of angle, fluid of thrust makes leaves has go power moments, overcome friction moments and fluid resistance zhihou leaves rotating, in torque balance Hou speed stability, in must of conditions Xia, speed and velocity