磁阻效应实验数据处理范例一、数据处理 1 测定励磁电流和磁感应强度的关系。自设表格记录励磁电流、，并算出对应的磁感应强度，根据表格中的数据画出IM-B关系曲线。表1：励磁电流和磁感应强度的关系0100200300400500600700800900100011.165.9122.0178.0234.5290.4345.7401.1454.9508.4558.711.1-45.3-101.8-157.7-213.8-269.8-325.2-380.7-434.8-488.3-539.1055.6111.9167.8224.2280.1335.4390.9444.8498.4548.901052113164225276327368389391034图1：关系曲线*选做：利用最小二乘法线性拟合得到励磁电流与磁感应强度关系为：线性拟合相关系数2测量磁感应强度和磁阻变化的关系。自设表格记录、，算出相应的、，并根据表格中数据作和关系曲线。有关计算公式如下：， 式中，当0时，算得，。表2：磁感应强度和磁阻变化关系(mA)(mV)(mV)(mV)(mA)(mV)(mA)（）（）06.16.102.52800.52.52031803014.2-2.88.52.47800.32.470.0193240.024016.5-5.611.02.44800.52.440.02563280.0325018.7-8.113.42.40800.32.400.03153330.0506021.1-10.715.92.35800.62.350.03823410.0727023.1-12.918.02.31800.12.310.04403460.0908025.3-15.220.22.25800.62.250.05083560.129027.4-16.722.02.20800.52.200.05663640.1410029.2-18.523.82.14800.12.140.06303740.1811030.9-20.325.62.08800.22.080.06953850.2112032.7-21.727.22.02800.32.020.07613960.2513034.5-22.328.41.97800.31.970.08144060.2814036.5-23.730.11.91800.51.910.08904190.31915037.6-24.931.21.86800.61.860.09494300.35516039.8-25.632.71.81800.61.810.1024420.39217041.2-26.533.81.78800.61.780.1074500.41618043.0-28.035.51.74800.71.740.1154600.44919044.5-29.336.91.72801.41.720.1214660.46720045.8-30.838.31.69800.71.690.1284740.49225052.8-38.445.61.61800.31.610.1604970.56530059.4-45.752.61.55800.81.550.1925170.62635065.9-52.659.21.49801.11.490.2255380.69240072.0-59.265.61.45800.91.450.2565520.73945077.6-65.371.41.40800.61.400.2885720.80050082.9-70.976.91.35800.71.350.3225930.86755087.7-76.181.91.31800.91.310.3536110.92560092.0-80.986.41.27800.51.270.3846300.98465096.1-85.390.71.23800.21.230.4176501.05700100.1-89.594.81.20800.91.200.4466671.10750103.4-93.398.41.16800.01.160.4796901.17800106.7-96.8101.81.13800.51.130.5097081.23850110.1-100.3105.21.10801.11.100.5407281.29900112.8-103.2108.01.07801.11.070.5707491.36950115.5-115.5115.51.04800.51.040.6277701.421000118.0-118.0118.01.02800.41.020.6547851.47图2：关系曲线（注意：有效数字的保留，打印的图表必须贴在统一的实验报告纸上）二、实验结果三、讨论