交流电感电桥法线胀系数测量实验仪

Linear expansion coefficient measurement instrument using AC inductance bridge method

将微小位移量转换成交流电桥中双线圈的电感变化量,利用交流电桥的高灵敏度实现了微小位移量的精确电测.采用传感器、单片机及多个PTC电加热器对样品棒进行均匀控温,同时安装散热风扇可使测试装置迅速降温.实验中增加了交流电桥调节、磁芯位移量与输出电压信号定标、最小二乘法数据处理等内容.将交流电桥与固体线胀系数测量2个基础实验结合起来,丰富了实验内容.

The micro displacement was converted into the inductance variation of the double coils in the AC bridge,and the accurate electrical measurement of the micro displacement could be realized due to the high sensitivity of the AC bridge.The sensor,single chip microcomputer and several PTC electric heaters were used to uniformly control the temperature of the sample rod.And a row of cooling fans were installed to cool the test device rapidly.The adjustment of AC bridge,the calibration between the core displacement and voltage output signal,and the data processing by the least square method were added in the experiment.The experimental contents were enriched by the combination of two basic experiments of AC bridge and solid linear expansion coefficient measurement.