摘要
地磁场在日常生活中起着非常重要的作用,目前地磁场的测量方法有很多种,部分实验方法已经应用于学生实验。我们利用永久磁铁在磁场中发生偏转后做阻尼运动的原理来测量磁场,为了准确测量振动周期,我们将一束激光照射在附着在永久磁铁上的小镜子,利用光杠杆原理放大纪录磁铁振动的轨迹,从而通过摄像分析精确计算磁铁振动周期,由此测出地磁场的水平分量。实验测得本地地磁场水平分量为0.0324mT。本文主要为学生进行探究实验提供方法和思路。
The geomagnetic field has played an important role in daily life.Recently,the geomagnetic field has been measured by a variety of measurement methods.Some of them have been applied to the student experiments.Here,the magnetic field was measured by the damped oscillation of a permanent magnet in the geomagnetic field.In order to accurately measure the period of the damped vibration,the vibration trajectory was magnified by the use of light lever.The horizontal component of the geomagnetic field could be measured by the accurate measurements of the oscillation periods.The measured result of the horizontal component of the geomagnetic field is 0.0324 mT.The aim of this paper is to provide some ideas and methods for students to do inquiry experiments.
出处
《物理与工程》
2018年第1期76-79,共4页
Physics and Engineering
关键词
地磁场
阻尼振动
光杠杆
geomagnetic field
damping vibration
light lever
