动、静态接触角计算软件及在硅橡胶憎水性检测中的应用

Dynamic and Static Contact Angle Calculation Software and Its Application to Silicone Rubber Hydrophobicity Detection

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。

For improving the accuracy and automation level of contact angle calculation,a dynamic and static contact angle calculation software system based on MATLAB GUI（Graphical user interface） was implemented,which could calculate contact angle manually or automatically.Of the automatic mode,the level set method was used to detect droplet edge,the algorithm based on solving partial differential equation had high adaptability,and the droplet optimal globule edge was obtained so as to make the subsequent processing convenient.Furthermore,an automatic edge detection algorithm based on threshold was realized.The contact angle algorithms based on tangent,circle fitting,ellipse fitting,goniometry,hypsometry,polynomial fitting,Young-Laplace fitting were realized.The principle,characteristic and application scope of those algorithms were analyzed.The fitting and calculation result could be displayed or saved as digital and figure,in the meantime,stored in database automatically.The software is used to detect silicone rubber hydrophobicity,and the results indicate that the software can obtain dynamic and static contact angle accurately and automatically in different conditions,and it can decrease workload effectively.