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为改进本科物理实验教学中对金属线胀系数的测定方法,基于霍尔效应原理,应用霍尔传感器测试手段,对微小长度进行测量。针对实验室中霍尔传感器不易定标这一难题,本实验创新性的提出使用朱利氏称进行定标,使定标简易、准确。本实验将实验教学中传统长度测量转变为电量测量,测量精度为微米量级,测量误差为0.5%,测量过程方便快捷、被测量少、测量设备占地小,因此可大大改观本科物理实验教学中的定标不准、实验耗时、占地面积较大等一系列问题。
In order to improve the measuring method of linear expansion coefficient of metal in undergraduate physics experiment teaching, based on the Hall effect principle, the Hall sensor test method is used to measure the tiny length. For Hall sensors in the lab is not easy to calibrate this difficult problem, the experiment proposed innovative use of the calibration scale, making the calibration simple and accurate. In this experiment, the traditional length measurement in experiment teaching was changed to electricity measurement, the measurement accuracy was on the order of micrometers, the measurement error was 0.5%, the measurement process was quick and easy, the measurement was less and the area of measurement equipment was small, so the undergraduate physics experiment teaching In the calibration is not allowed, the experiment time-consuming, covers a large area and a series of problems.