串花盆 （也称为电缆驱动的位置传感器、拉线传感器、弦电位器和悠悠球）将机械运动转换为可以计量、记录或传输的电信号。FirstmarkControls弦位置传感器由缠绕在螺纹鼓上的不锈钢位移电缆组成，螺纹鼓直接耦合到精密、长寿命的传感器。在操作上，换能器安装在固定位 
置，延长电缆连接到移动物体。随着运动的发生，排量拉索抽出，然后在内部工程弹簧的力量下缩回，该弹簧还在整个行程中保持排量拉索上的张力。传感器的旋转产生与位移电缆成比例的电输出，指示位置平移。
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