周期性弦链系统振动模研究实验介绍  

Vibration modes of periodical string-chain

作　　者：荀坤[1] XUN Kun(Teaching Center for Experimental Physics, Peking Unversity, Beijing 100871, China)

机构地区：[1]北京大学基础物理实验教学中心,北京100871

出　　处：《物理实验》2017年第3期25-30,36,共7页Physics Experimentation

摘　　要：围绕物理、技术和能力培养的课程目标,详细地介绍了北京大学近代物理实验课中"周期性弦链系统振动模研究"的建设和教学情况.周期性弦链系统是一段等间距穿有小球的细弦.实验要求用动态信号分析仪获得不同实验条件下的几种有限周期弦链的振动谱,并由此得到对应的无限长弦链的振动谱结构.此实验有助于理解周期性与带状谱结构之间的关系,了解动态信号分析技术,也比较适合于训练在数学抽象与物理图像间建立联系的能力.In view of the course aim for education on physics, technology and ability, the experi- ment of vibration modes of periodical string-chain in the modern physics laboratory of Peking Univer- sity was introduced in detail. The periodical string-chain was a periodically beaded string. The vibra- tion spectra of different finite string-chains were measured by a dynamic signal analyzer, and the band structure of an infinite string-chain corresponding to the finite string-chain could be derived. The ex periment was helpful to understand the relation between the periodicity and band spectra, and to train the ability to associate abstract mathematics with physical picture.

关 键 词：周期系统 能带 谱带 动态信号分析 

分 类 号：O413.1[理学—理论物理] O32[理学—物理]