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首页> 外文会议>2011 International Conference on Electrical and Control Engineering >Study of static contact angle measurement method based on least squares fitting
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Study of static contact angle measurement method based on least squares fitting

机译：基于最小二乘拟合的静态接触角测量方法研究

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摘要

In order to get accurate measurement of static contact angle of silicone rubber, the method based on the least squares fitting is proposed to obtain static contact angle through fitting the globule edge. This method fits the globule edge by the least square method according to the rule that the globule edge is round if the globule only has little water. Then, Levenberg-Marquardt algorithm is used to calculate the least squares fitting, the formula used in the fitting procedure is deduced theoretically, the algorithm flow chart is given, and the program is implemented. For simulated globule images and real globule figures, the protractor method and the fitting method proposed by the paper is used respectively to get the static contact angle. The results show that the proposed fitting method can effectively reduce the subjective influence by the protractor method of the measurement results, and it can also improve the measurement accuracy of the static contact angle in great degree. This paper studies the effect of the water volume on the accuracy of this paper's algorithm, the results show that the error increases gradually with the increased volume.
机译：为了准确测量硅橡胶的静态接触角，提出了一种基于最小二乘拟合的方法，通过对球状体边缘进行拟合来获得静态接触角。如果球状体只有很少的水，则根据球状体边缘为圆形的规则，通过最小二乘法对球状体边缘进行拟合。然后，采用Levenberg-Marquardt算法计算最小二乘拟合，从理论上推导了拟合过程中所用的公式，给出了算法流程图，并实现了程序。对于模拟的球体图像和真实的球体图形，分别采用了本文提出的量角器法和拟合法来获得静态接触角。结果表明，所提出的拟合方法可以有效地减少量角器法对测量结果的主观影响，也可以在很大程度上提高静态接触角的测量精度。本文研究了水量对算法精度的影响，结果表明误差随着水量的增加而逐渐增大。

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