A measurement method for distinguishing the real contact area of rough surfaces of transparent solids using improved Otsu technique

An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illumi...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 1; pp. 354 - 360
Main Author 宋保江 阎绍泽 向吴维凯
Format Journal Article
LanguageEnglish
Published 2015
Subjects
Contact
Contact pressure
Lasers
Measurement methods
Otsu方法
Polymethyl methacrylates
Reflection
Screens
接触界面
接触面积
测量方法
粗糙表面
联系人信息
聚甲基丙烯酸甲酯
透明固体
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Summary:An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate（PMMA）material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.
Bibliography:Song Bao-Jiang,Yan Shao-Ze,Xiang Wu-Wei-Kai（State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China）
real contact area; total internal reflection; improved Otsu method; hysteresis phenomenon
11-5639/O4
An experimental method of measuring the real contact area of transparent blocks based on the principle of total internal reflection is presented, intending to support the investigation of friction characteristics, heat conduction, and energy dissipation at the contact interface. A laser sheet illuminates the contact interface, and the transmitted laser sheet is projected onto a screen. Then the contact information is acquired from the screen by a camera. An improved Otsu method is proposed to process the data of experimental images. It can compute the threshold of the overall image and filter out all the pixels one by one. Through analyzing the experimental results, we describe the relationship between the real contact area and the positive pressure during a continuous loading process, at different loading rates, with the polymethyl methacrylate（PMMA）material. A hysteresis phenomenon in the relationship between the real contact area and the positive pressure is found and explained.
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/1/014601