霍尔效应的地下位移三维测量方法研究

3D measurement of underground displacement based on Hall effect

当霍尔传感器与磁钢之间的相对位置变化时,霍尔传感器感受到的磁感应强度也随之变化,从而导致传感器的输出电压改变.采用三个霍尔传感器组成传感器阵列,建立三维笛卡儿坐标系.通过测量传感器的输出电压并结合一定的算法,可计算出某一时刻磁钢的三维坐标.地下土体的变形会改变霍尔传感器与磁钢之间的相对位置.在得到磁钢新的三维坐标之后,通过几何运算得出位移的大小.

When the relative position of the Hall sensor and the magnetic steel changed,the magnetic induction induced by the Hall sensor changed as well as its output voltage.A new kind of displacement sensor was composed of three Hall sensors,and a 3D Cartesian Coordinate System was established.The 3D coordinate of the magnetic steel can be calculated by measuring the output voltage with a special algorithm.Underground soil deformation will change the relative position of the Hall sensor and the magnetic steel.The size of the geotechnical 3D displacement can be calculated after getting the new 3D coordinate of the magnetic steel.