用PC测量交变磁场

摘要：本文叙述用采集线圈（磁传感器）,一台个人电脑，音效（声卡），等简单设备测量交流电线周围存在的磁场和通电螺线管产生的交变磁场，实现磁场相对大小，交变频率可视。交流电线周围存在一个很弱的交变磁场，通电螺线也会产生一个较强的交变磁场，我们通过磁感应器采集信号，再输入声卡，声卡对信号进行模数转换，将采集模拟信号转换成数字信号输入电脑并显示出来，通过对测的数据，图形进行比较和分析，得出磁场的变换频率和相对大小。

关键词：个人电脑；声卡；磁场；A/D转换

The measurement of the alternating magnetic field using a personal computer
 
Abstract：This paper describes the  measurement of ac electric wires around the field  using Acquisition coil (magnetic sensors) ，a personal computer，Sound (sound card) ，Amplifiers and other simple equipment . Make the magnitude of the magnetic field and AC Frequency Visualization，An electrical current in a wire produces a weak magnetic field H around the wire, We use magnetic sensors to Acquisition the Weak signal ,then ,input sound card ,the analog signals have been transformed into digital signals by the sound card and been displayed by the personal computer.

Keywords : PC；sound card； magnetic field； A/D conversion
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