电涡流位移传感器是一种能将非电量转化成电信号的非接触式测量装置，它的灵敏度高、稳定性好、抗干扰能力强，市场需求量大。电涡流位移传感器的稳定性及如何提高电涡流位移传感器的测量范围并降低探头线圈尺寸目前是我们需要解决的关键问题，这对提高电涡流位移传感器的使用性能具有重要的实际意义。 　　　为了解决上述问题，针对电涡流位移传感器的应用进行了以下几方面的研究：一是分析线圈参数对电涡流传感器的影响，从改变线圈尺寸形状入手，利用有限元仿真电磁场建立模型，通过简化分析二维模型，得到涡流线圈电磁场模型得出电磁场电涡流的分布状况，对其进行分析求解并跟论著上结果进行对比证明建模的合理性，进而优化线圈；二是在电路设计上采用调频式测量是以频率信号作为准数字量输出的硬件转换电路，单片机控制外围电路对频率信号可以直接识别接收，电路设计简单，能有效克服电路转化参数对频率信号的影响，提高测量精度。在软件中实现数据采集，数据存储及数据显示模块的程序设计，对程序进行编译仿真，并引入非线性校正算法减小测量误差；三是为了减小电涡流位移传感器的非线性误差，提高传感器的线性测量范围，对采集到的实验数据进行多种函数曲线拟合分析，并引进人工神经网络对数据进行映射，分析出最佳数据处理方法，提高传感器的测量范围降低非线性度，对改进传感器的使用性能提供依据。 实验结果表明：该数字式测量电路能实现电涡流传感器的大位移数据采集并且稳定性良好。通过此非接触式测量电路的设计可更好的实现大位移测量的需求，不但节省了成本，并且提高了测量系统的工作效率，为非接触式测量系统的完善奠定了一定的基础

Eddy current displacement sensor is a non-power into electrical signals of a can of non-contact measurement device, Its high sensitivity, good stability, strong anti-interference ability, the market demand. The stability of the eddy current displacement sensor and how to improve the eddy current displacement sensor measuring range and reduce the size of the probe coil that we need to solve critical issues at present, This has important practical significance to improve the performance of eddy current displacement sensor. 　　　In order to solve the above-described problems, The following aspects of the research for the application of the eddy current displacement sensor: One is the analysis of the effect of coil parameters on the eddy current sensor，from the coil to change shape, using the finite element simulation model of the electromagnetic field, through the simplified analysis of two dimen sional model, get eddy current coil electromagnetic field model, see the electromagnetic field different displacement from the model the distribution of the magnetic field lines, analyze the solution and the results were compared with works, draw the modeling of the rationality；Two is on circuit design by using frequency modulation type measuring method based on frequency signal as a digital output hardware conversion circuit, singlechip microcomputer control peripheral circuit of the frequency signal can be directly received recognition, circuit design is simple, can effectively overcome the parameters on the influence of the frequency signal circuit transformation, improve the accuracy of measure- ment. In software for data acquisition, data storage and data display module progr- am design, to compile the simulation program, and introduced the nonlinear correction algorithm is to minimize measurement errors;Three is in order to reduce the nonlinear error of eddy current displacement sensor, improve the linear measure- ment range of sensor, experimental data were collected on a variety of curve fitting analysis, and introduce artificial neural network to map data, analysis of the optimal method of data processing, sensor's sensitivity to reduce the nonlinearity, provide a basis to improve the sensor performance. 　　　The experimental results show that: The digital circuit can achieve a large displacement of the eddy current sensor data acquisition and better stability.Through the non-contact measurement circuit design can be better implementation of large displacement measurement requirements，Not only save the cost,And improve the efficiency of the measurement system,For the perfection of the non- contact measuring system laid a certain foundation.