基于线性霍尔传感器的液体黏度测量实验仪

Measuring liquid viscosity based on linear Hall sensor

利用线性霍尔传感器改进传统落球法测量仪器,可以测量非透明液体的黏度.用磁性球替换钢球,采用4个霍尔传感器HG-302C输出受磁性小球下落所引起的霍尔信号,STM32F103ZET6微控制器实现信号的采集、时间计时和数据上传,LabVIEW程序实现信号的显示与数据的接收保存,Matlab拟合数据得到小球的终极速度.经实验测试,蓖麻油的黏度测量偏差为3.3%.

The traditional falling ball measuring instrument was improved using linear Hall sensor,and the viscosity of non-transparent liquid was measured.The rigid ball used in the traditional falling ball method was replaced with a magnetic ball,4 Hall sensors HG-302C were used to detect the falling of the magnetic ball.STM32F103ZET6 microcontroller realized the signal collection,time counting and data upload.LabVIEW program realized the signal display and data reception and storage.Matlab was used to fit the signal data to get the terminal speed of the ball.After experimental testing,the viscosity error of castor oil was 3.3%.