超亲水薄膜表面接触角的高精度测量

 作为极端润湿表面的一种，超亲水薄膜表面由于具有自清洁、防雾、防腐蚀等特性，成为现代工业、城市建设等领域的研究重点之一。界定极端润湿表面的一种方法为接触角的测量，因此获得更高精度的接触角对极端润湿表面工程具有重要意义。讨论了在超亲水薄膜表面提高接触角精度的3种算法，包括量高法、圆拟合法及椭圆拟合法，结果显示接触角在接近0°时通过圆拟合算法能够提高计算精度。

High precision contact angle algorithms for ultra hydrophilic film surface

As a kind of extremely wetting surface, the surface of superhydrophilic film has become one of the focuses of research in the field of the modern industry and the urban construction because of its self-cleaning, anti-fog and anti-corrosion properties. One method of defining extremely wetting surfaces is the measurement of contact angles, therefore, it is significant to obtain a high precision contact angle in the extremely wetting surface engineering. In this paper, several contact angle algorithms for improving contact angle accuracy for the ultra hydrophilic film surface are proposed, including the high volume method, the circle fitting method and the ellipse fitting method. In addition, it is shown that the accuracy of the calculation can be improved by the circular fitting algorithm when the contact angle is close to zero.