摘要
驻波法运用驻波原理,采用人为控制金属丝形变,测出金属丝驻波基频,得出其张力,从而求出金属丝杨氏模量.相对传统方法,驻波法避免了金属丝直径和形变的测量,其不确定度基本上仅由千分尺精度决定,故而具有操作简单,测量准确度高的特点.
Using the standing wave theory,we propose a standing wave method for measuring Young＇s modulus.The method controls deformation of wire artificially and measures basis frequency of wire to obtain its tension and then Young＇s modulus.In comparison with traditional methods,the standing wave method avoids measuring diameter and deformation of the wire,thus,it is easy to operate.Furthermore,its uncertainty is mainly ruled by the micrometer precision.Hence,the method has high accuracy.
出处
《大学物理》
北大核心
2010年第12期25-30,共6页
College Physics
关键词
驻波
基频
张力
杨氏模量
不确定度
standing wave
basis frequency
tension
Young＇s modulus
uncertainty
