基于单片机的亥姆霍兹线圈磁场分布测量装置的研制

Design and Manufacture of the Device for Measuring Helmoholtz Coil Magnetic Induction Intensity Based on AVR Microcontroller

介绍了设计制作的基于AVR单片机的亥姆霍兹线圈磁感应强度分布测量装置。单片机统一协调和控制整个系统的工作,步进电机和丝杆控制霍尔元件的移动,A/D芯片将霍尔电压转换为数字信号,通过USB接口传输到上位机,上位机计算磁感应强度,并画出磁感应强度分布曲线。装置工作稳定,测量结果与理论值符合较好,可用于学生实验或演示实验中。

The device for measuring Helmoholtz coil magnetic induction intensity based on AVR microcontroller is introduced.This device works under the control of a microcontroller,the Hall probe is driven by the screw mandrel and a step motor,the Hall voltage is converted to digital signal by an A/D chip and is transmitted to a computer.The magnetic induction intensity is calculated and the distribution curve is drawed by the computer.The device works stably and the result obtained by this device is almost the same compared with that calculated from theoretical formula,so that this device can be used in students＇ physics experiments or demonstration experiments.