基于位置敏感器件的杨氏模量测量

Measurements of Young's Modulus Based on Position-Sensitive Devices

利用位置敏感器件将经典的拉伸法测杨氏模量中金属丝的微小伸长量转换成电压信号变化,再由放大电路放大后,经过数据采集卡接入计算机进行实时数据采集,实现了杨氏模量的数字化测量。实验运用了现代科技测量的新器件、新技术,将硬件和软件在传统物理实验上进行了融合,实验数据处理设计了代表性的最小二乘法线性拟合和逐差法进行处理,测量结果可靠,可作为一个典型的综合性物理实验进行教学推广和使用。

In the Young's modulus experiment by classical tensile method,a position sensitive device is used to convert the tiny elongation of the metal wire to the change of voltage signal.The voltage signal is amplified by the amplifier circuit,and sent to the computer for real-time data acquisition with the data acquisition card,then the digital measurement of Young's modulus is realized.The new devices and technologies of modern scientific and technological measurement are used,and the hardware and software in traditional physics experiments are integrated,and representative least square linear fitting and successive difference method for experimental data processing are designed in this experiment.The measurement results are reliable and the experiment can be used as a typical comprehensive physics experiment for teaching promotion.