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High-precision radius measurement of ball indenter
Affiliation:1. Beijing Key Lab for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;2. School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China;1. College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan Province 610064, China;2. Centre for Optical and Laser Engineering, School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. Beijing Key Lab of Spatial Information Integration and 3S Application, Peking University, Beijing 100871, China;1. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China;2. Faculty of Science, Jiangsu University, Zhenjiang 212013, China;3. Jingjiang College, Jiangsu University, Zhenjiang 212013, China
Abstract:To solve the problem of calibrating the radius of a ball indenter in a hardness tester, a laser confocal radius measurement and calibration method for the ball indenter is proposed without separating the ball from the body of the indenter. The laser confocal radius measurement and calibration method uses the maximum of the confocal axial intensity curve to precisely identify the cat’s eye and confocal position of the test ball indenter. The distance between these two positions is then measured to achieve high-precision radius measurement. The theoretical analyses and experimental results indicate that the radius measurement uncertainty of the ball indenter with a diameter of 1.5875 mm is within 0.12 μm.
Keywords:Ball indenter  Radius measurement  Confocal  Measurement uncertainty
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