摘要
利用RLC串联谐振电路可以高精度测量电感的原理,将其用于测量金属丝的杨氏模量。将磁棒固定在待测金属丝上,其一部分放在螺线管内部,并用自制的密绕长螺线管代替RLC串联谐振电路中的电感。外力作用下金属丝的伸长会引起螺线管内磁棒的长度的变化,从而引起螺线管电感的改变。因此可以通过测量螺线管的电感的变化实现金属丝细小伸长量的测量。该方法简单易行,测量精确度高,具有一定的实用价值和良好的应用前景。
We measure Yang＇s modulus of metallic wire by RLC series resonance circuit for its higher preci- sion in measurement of inductance. We replace inductance with a solenoid,in which center there is a magnetic rod fixed on metallic wire being tested. In a continuous and uniform increasing force, the inductance of solenoid varied with the length change of the magnetic rod in solenoid. By measuring the inductance of RLC series reso- nance circuit, we can precisely measure the mini-elongation of metallic wire. Theoretical analysis shows that this method not only possesses the advantages of simple and high precision but also realizes the electric meas- urement of non-electricity. It is practical and has good application prospect.
出处
《大学物理实验》
2015年第5期53-56,共4页
Physical Experiment of College
基金
河北省高校重点学科项目和大学生创新创业训练计划项目(201413584001)
河北工业大学教育教学改革研究项目(201303002)
