杨氏模量测定的尺镜组装置研究与设计  

Research and Design on Ruler-telescope Group Devices of Measuring Young's Modulus

作　　者：钱良存[1] 朱德泉[1] 洪炜宁[1] 刘家菊[1] 段志刚[1] 汪大勇[1] 

机构地区：[1]安徽农业大学理学院,安徽合肥230036

出　　处：《河南科技大学学报（自然科学版）》2008年第6期10-13,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：安徽农业大学校长青年基金;安徽省高等学校省级自然科学研究项目(KJ2007B118)

摘　　要：为了提高杨氏模量测定精确度,从试验误差角度分析,得出因尺镜组调节不当引起误差,从而降低了杨氏模量测量的准确度;从测量不确定度和有效数字处理角度分析,得出杨氏模量的测量精度被尺镜组所制约。因此,对测量方法和尺镜组装置进行了改进,将标尺设计为最小分度值为0.02mm移动铅直标尺,望远镜设计为准直望远镜,光杠杆镜面到标尺距离为1.2362m以上。通过试验,得出测量结果总不确定度由0.07×1011N·m-2下降为0.025×1011N·m-2,使测量结果的有效位数增加一位,减小了人为调偏标尺和望远镜的误差。To improve accuracy of Young's modulus, this paper analyzes the measuring errors.They are caused by inaccurate adjusting ruler-telescope group,so the measured Young's modulus exactitude is cut down.Due to measuring uncertainty and processing significant figure,the experimental precision is determined by the millimeter graduated ruler of ruler-telescope group devices.To improve the measuring method and the accuracy of ruler-telescope group devices,the ruler and telescope in ruler-telescope group are designed as the vertical sliding ruler graduated 0.02 mm and the horizontal axis telescope.The sliding ruler is departed from the optical lever mirror above 1.2362 m.All the measuring uncertainty decreases from 0.07×1011N·m-2 to 0.025×1011N·m-2,and the significant figure on measuring result increases by one place during the tests.Artificial errors are decreased in inaccurate adjusting ruler-telescope group.

关 键 词：精确度 移动铅直标尺 杨氏模量 准直望远镜 

分 类 号：TB302.1[一般工业技术—材料科学与工程]