驻波法测杨氏模量及误差分析  

Standing wave method for measuring Young's modulus and its error analysis

作　　者：陈美华[1] 

机构地区：[1]嘉应学院物理与光信息科技学院,广东梅州514015

出　　处：《大学物理》2010年第12期25-30,共6页College Physics

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.

关 键 词：驻波 基频 张力 杨氏模量 不确定度 

分 类 号：O348.8[理学—固体力学] O433[理学—力学]