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为了提高接触角计算的准确性和自动化程度,基于MATLAB的图形用户界面(graphical user interface,GUI)实现了一套动态和静态接触角计算软件系统,实现了手动方式和自动方式获得液滴接触角的方法,自动方式中基于水平集方法自动获得液滴边缘,该方法基于偏微分方程,能获得全局最优的液滴边缘,抗干扰能力强,后续处理方便,另外还实现了基于阈值的自动边缘提取算法。接触角计算中实现了切线法、圆拟合法、椭圆拟合法、量角法、量高法、多项式拟合法、Young-Laplace拟合法等算法。分析了典型算法的原理、特点和适用范围。拟合和计算结果能以数字、图像方式显示和存储,同时自动存入数据库。将该软件应用于硅橡胶憎水性检测,结果表明在不同情况下该系统均能自动、准确获得动静态接触角,可在很大程度上节省接触角计算的工作量。
In order to improve the accuracy and automation of contact angle calculation, MATLAB graphical user interface (GUI) implements a set of dynamic and static contact angle calculation software system to achieve a manual and automatic way to get the droplet contact angle The method automatically obtains the edge of the droplet based on the level set method in the automatic method. The method can obtain the global optimal edge of the droplet based on the partial differential equation, has strong anti-interference ability and convenient subsequent processing, and also realizes automatic threshold based Edge extraction algorithm. The tangent method, the circle fitting method, the ellipse fitting method, the angle measuring method, the high-volume method, the polynomial fitting method, the Young-Laplace fitting method and the like are implemented in the contact angle calculation. The principle, characteristic and applicable range of typical algorithms are analyzed. Fitting and calculation results can be displayed in digital and image formats and stored automatically into the database. The software was applied to the detection of hydrophobicity of silicone rubber. The results show that the system can obtain the dynamic and static contact angles automatically and accurately in different situations, which can save the workload of contact angle calculation to a large extent.