一种新型线性位置感测器的研制

New Research of Linear Position Sensing

为准确检测移动物体的线性位置,采用新型数字式、非接触电感传感器LDC1000,前端有分布不均匀的矩形自制电感线圈,形成LC振荡电路。当金属物沿着矩形线圈移动时,由于互感作用产生电涡流,涡流对自制线圈的振荡产生反作用,引起自制电感线圈振荡频率变化,LDC1000将其转换为高达28位的数字量输出。由于线圈不对称,在不同的位置将会产生不同的输出,以此来测试金属物的线性位移。实验结果表明:该设计可准确地测量金属物体的直线位移,精度高达0. 3 mm。

In order to accurately detect the linear position of the target,a new non-contact inductance sensor LDC1000 was adopted.The front end had a rectangular self-made inductor coil with uneven distribution to form LC oscillation circuit.When the metal objects moved along the rectangular coil,eddy current was generated due to mutual inductance,and the eddy current reacted on the oscillation of the homemade coil,causing the variation of oscillation frequency of the homemade inductor coil.The LDC1000 converted it to 28 bits digital output code.Because the coil was not symmetric,different outputs can be generated at different locations to test the linear displacement of metal objects.The test results show that the design can accurately measure the linear position of the metal target.The measurement accurately can reach up to 0.03 mm.