液压微位移传递法测金属线胀系数

针对金属线胀系数测定仪,以铜棒为研究对象,用自制液压微位移传递器替代光杠杆和望远镜横直尺,对传统的实验装置进行了改进,用液压微位移放大原理来表征铜棒的微小伸长量,由实验原理及其不确定度分析,结合测量数据,对液压微位移传递法测金属线胀系数的实验方法进行了详细的分析与讨论。该方法既能提高实验测量精度,又能降低实验成本。用置信概率为95的不确定度对实验数据及实验结果进行分析与评定,给出了更加合理的实验结果。由此给出一种测量金属线胀系数新的实验方法。

Study on Measuring Expansion Coefficient of Metal Wire by Hydraulic Micro-displacement Transfer Method

For measurement of metal wire coefficient, this papeies studies on copper bar with self-made hydraulic micro-displacement transfer in place of optical lever and telescope. The paper improves the traditional experiment instrument and denotes slight elongation of wire bar with the principle of hydraulic micro-displacement magnifying mechanism. According to experiment principle, uncertainty analysis and measurement data, the paper analyzes and discusses the experiment approach of hydraulic micro-displacement transfer measuring expansion coefficient of metal wire. The new approach can not only improve measuring accuracy, but also reduce test cost. The paper makes use of uncertainty with confidence probability of 95 % to analyze and evaluate the measurement data, and attain more reasonable result. At last, the paper puts forwards a new approach to measure expansion coefficient of metal wire.