用近距转镜式杨氏模量仪测量金属丝的杨氏模量

MEASURING YOUNG MODULUS OF WIRE WITH ROTATING TELESCOPE AT CLOSE RANGE

本文主要研究用数显近距转镜测量金属丝杨氏模量的方法,其测量方法的关键在于对金属丝的微小长度变化量的精确测量,即光杠杆法。光杠杆法可以实现非接触式的放大测量,具有直观、简便和精确度高等特点,在物理实验教学中经常被采用,是测量金属丝杨氏模量的理想方法。

This paper mainly studies the method of measuring the young modulus of metal wire with digital near distance rotating mirror.The key of the measurement is to measure the small change of the wire length accurately,that is,the optical lever method.Optical lever method can realize non-contact amplification measurement.It has the advantages of direct viewing,simple and high accuracy.It is often used in physics experiment teaching.It is an ideal method to measure Young modulus of wire.