摘要
针对杨氏弹性模量测量精度不高的问题,从测量不确定度和有效数字处理入手,提出相对不确定度是影响测量精度的主要因素,通过试验,得出尺镜组装置中标尺使用是制约整个测量精度的瓶颈。从测量精度的角度改进杨氏弹性模量测量装置,将尺镜组中标尺改进为自制的移动标尺,描述了自制移动标尺装置,并将光杠杆常数的测量仪器由米尺改进为游标卡尺。采用改进方法和装置,通过试验得出,测量结果总不确定度下降了47.2%。
Focusing on the lower measurement accuracy of Young’s elastic modulus,this paper submits that the main factor of measurement accuracy is relative uncertainty from measurement uncertainty and processing significant digits. Through tests,a conclusion is drawn that using the ruler of ruler-telescope in experimental devices is a bottle-neck of the experimental accuracy. From measurement accuracy,two improvements are made that the ruler of ruler-telescope improves into self-made shift-ruler and self-made describ...
出处
《机械工程师》
2008年第7期39-41,共3页
Mechanical Engineer
基金
安徽农业大学校长青年基金项目
江苏省现代农业装备与技术重点实验室开放基金项目(NZ200607)
关键词
杨氏弹性模量
不确定度
自制移动标尺
Young’s elastic modulus
uncertainty
self-made shift-ruler
