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Creep deformation measurement using quartz optical fiber |
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| Authors: | X. Y. He J. Xia C. Quan C. J. Tay S. D. Tu |
| Affiliation: | a Department of Engineering Mechanics, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China b Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore c Department of Mechanical Engineering, Nanjing University of Chemical Technology, Nanjing, Jiangsu 210009, People's Republic of China |
| Abstract: | This paper describes an optical system for high temperature creep strain measurement using quartz optical fiber, super long working distance microscope and digital image processing techniques. In this system one end of the quartz optical fibers is arrayed in a small area on the specimen surface and the other end is illuminated by a laser beam. The fiber ends on the specimen surface form the spot array. The small optical spots on the specimen are tracked by a CCD camera and the images are processed by digital image processing software. The diameter of each quartz fiber is 100 μm and the fibers can be arrayed in a small area. The local strains are determined by measuring the variety of relative distance between two spots. Experimental results of local creep strain on the welding joints of 15CrMo and HK40 at 850°C are obtained. |
| Keywords: | Quartz optical fiber Digital image processing High temperature strain Sub-pixel |
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