利用高速LED秒表与数码相机测量液体黏度  

Measuring viscosity with falling ball method using high speed LED stopwatch and digital camera

作　　者：安郁宽[1] 

机构地区：[1]滨州医学院物理教研室,山东烟台264003

出　　处：《物理实验》2018年第1期14-18,共5页Physics Experimentation

基　　金：山东科技发展计划(政策引导类)(No.2011YD02094)

摘　　要：为解决落球法测量液体黏度实验中小球速度v的测不准等问题,制作了高速显示的LED秒表,用数码相机记录小球通过高度h上下两端时标尺上的位置h_1和h_2以及当时LED秒表的示数t_1和t_2,进而计算小球速度v.实验测定了小球在甘油中的终极速度和刚进入甘油时的下落情况.结果表明:该方法不仅测量小球速度v的重复性较好,而且还能用于判定小球是否进入匀速状态.In order to measure velocity with falling ball method,a high speed LED stopwatch was made.A digital camera was employed to record both the coordinates h1,h2 of two points and the readings t1,t2 of the LED stopwatch at the moments when the ball passing the points.The height h was obtained by the difference between h2 and h1 and the parallax was corrected.The time interval t was determined by the difference between t2 and t1.The velocity of the falling ball v was calculated.Experiments were carried out to determine the terminal velocity of the ball in glycerol and the falling process was recorded as soon as the ball fell into glycerol as well.The results showed that the repeatability of the method was very well.The method could also be used to estimate if the ball was in the uniform speed phase.

关 键 词：黏度 终极速度 落球法 视差修正 

分 类 号：O311[理学—一般力学与力学基础]