摘要
分析了基于传统光杠杆放大法测量金属丝微小伸长量的杨氏模量的不确定度,发现由于标尺的精度低和操作繁琐造成学生实验疲劳,是引起测量精度低的主要原因。为此,本文设计了一种基于光功率计监视的新型实验装置,不仅简化了操作,而且提高了测量精度,可以使杨氏模量的测量相对不确定度达到3.21%。
It is analyzed for the uncertainty of the measurement of small elongation based on traditional optical lever method.The results showed that the main cause of low measuring precision is the low accuracy of the scale and the intricacy for the operation.It designs a new experiment device based on optical power meter to monitor,which can simplify the operation and improves the accuracy of measurement.The experimental results have shown that the relative uncertainty of young’s modulus measurement up to 3.21%.
作者
张胜海
杨晓娜
ZHANG Shenghai;YANG Xiaona(Department of Basic,Information Engineering University,Zhengzhou 450002,China)
出处
《大学物理实验》
2022年第2期102-105,共4页
Physical Experiment of College
关键词
杨氏模量
静态拉伸法
光功率计
不确定度分析
Young’s modulus
static stretching method
optical power meter
uncertainty analysis
