利用视频分析软件和分析天平改进落球法测液体黏度

Fluid viscosity measurement using falling-ball method combined with video analysis and analytical balance

通过对传统落球法进行改进,利用分析天平测量小球质量,利用视频分析软件Tracker分析测量小球位置,并利用其内置的最小二乘拟合功能获得小球的终极速度,由此测得出蓖麻油黏度.相比传统测量方法,测量精度提高近一个数量级.

The traditional experimental device for measuring the fluid viscosity by falling-ball method was improved.The mass of the globule was measured by analytical balance,its position was analyzed and measured by the video analysis app Tracker.The terminal velocity was obtained by the least square fitting function built-in Tracker software,and the viscosity of castor oil was calculated.Compared with the tradition experimental method,the accuracy of the measured viscosity was improved by nearly one order of magnitude by the improved method.