电容式位移传感器的非线性拟合比较  

Nonlinear fitting comparison of capacitive displacement sensors

作　　者：张菡 薄涵亮[2] 王帅 杨文龙 傅一帆[1] Zhang Han;Bo Hanliang;Wang Shuai;Yang Wenlong;Fu Yifan(National Computer System Engineering Research Institute of China,Beijing 100083,China;Institute of Nuclear and New Energy Techgology,Tsinghua University,Beijing 100084,China)

机构地区：[1]华北计算机系统工程研究所,北京100083 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《电子技术应用》2019年第9期89-92,96,共5页Application of Electronic Technique

基　　金：核高基重大专项(2017ZX01030202)

摘　　要：针对控制棒落棒时棒位指示传感器的电容和位移关系,在水平位置下,在4种不同的工况下将控制棒数据进行标定,对标定得到的电容值取最大值和最小值的二分之一作为拟合值,分别采用三次样条插值、最小二乘法、BP神经网络的方法对数据进行拟合,然后使用4种工况下得到的原始数据进行插值观察误差并做残差分析。MATLAB拟合结果表明,三次样条插值具有良好的效果。Aiming at the relationship between capacitance and displacement of the rod position indicator sensor when the control rod drops,the data of the control rod are calibrated in four different working conditions at the horizontal position.One half of the maximum and minimum capacitance values obtained from the calibration are taken as the fitting values.The data are fitted by cubic spline interpolation,least square method and BP neural network method respectively,and then the data are fitted by using the method of cubic spline interpolation,least square method and BP neural network.The original data obtained under four working conditions are interpolated and observed errors are analyzed.The results of MATLAB fitting show that cubic spline interpolation has a good effect.

关 键 词：电容式位移传感器 三次样条插值 非线性拟合 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]