邱白晶,赵晓丽,贾卫东,张振磊.基于图像的植物叶面雾滴接触角稳定区间法测[J].农业机械学报,2009,40(5):139-144.
.Interval Method Based on Images to Measure Drop Contact Angles on Plant Leaf Surfaces[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(5):139-144.
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基于图像的植物叶面雾滴接触角稳定区间法测   [下载全文]
Interval Method Based on Images to Measure Drop Contact Angles on Plant Leaf Surfaces   [Download Pdf][in English]
  
DOI:10.3969/j.issn.1000-1298.[year].[issue].[sequence]
中文关键词:  雾滴  叶面  接触角  测量  图像处理  数值方法
基金项目:
邱白晶  赵晓丽  贾卫东  张振磊
江苏大学
中文摘要:发展了单侧液滴轮廓拟合生成接触角的方法,提出了接触角稳定区间概念,建立了拟合函数选优和拟合像素数选取的数值试验方法。本文方法与轴对称积分法相比,偏差为1.92%。但本文方法没有引入轴对称条件,因而可测非对称液滴接触角。对桂花叶上去离子水滴接触角的测量研究表明:可用三阶多项式在像素数区间[110,160]上拟合生成接触角;主叶脉方向和与之垂直的方向之间接触角差异明显,均值相差7.15°,同一方向上左右接触角均值相差
Key Words:
Abstract:1.33°。The measurement method was developed for determining contact angle by fitting the unilateral drop profile. The concept of contact angle’s stable interval was put forward, and a numerical experiment method for the optimization of fitting functions and fitting pixel numbers was established. The presented method was compared to the axisymmetric integral method, with contact angle deviation 1.92%. Because the axisymmetric condition was not introduced in this method, it can be used to measure contact angles of non-axisymmetric drops. The contact angles of deionized water on Osmanthus fragrans leaves were measured, and the research results show that: three degree polynomial can be used to fit the drop profile in the pixel number interval and determine contact angle; the contact angles between the principle vein direction and the direction perpendicular to it are obviously different, with the average discrepancy 7.15°, the average discrepancy of left and right contact angles on the same direction is 1.33°.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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