Optical gage for high-temperature strain measurement by using quartz optical fiber

Jun Xia; Chen Wang; Xiaoyuan He; S. D. Tu; J. M. Gong

doi:10.1117/12.429576

13 June 2001 Optical gage for high-temperature strain measurement by using quartz optical fiber

Jun Xia, Chen Wang, Xiaoyuan He, S. D. Tu, J. M. Gong

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429576
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

This paper describes an optical system for high temperature strain measurement by using quartz optical fiber, super long working distance microscope and digital image processing techniques. In this system one ends of the quartz optical fibers are arrayed in a small area on the specimen surface and the other ends are illuminated by a laser beam. The fiber ends on the specimen surface from 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. As the diameter of each quartz fiber is only 100 microns the fibers can be arrayed in a tiny area. The local strains were determined by measuring the variety of relative distance between two spots. The measurement results of local creep strain on the welding joints of 15CrMo and HK40 at 850 degrees C are obtained.

Citation Download Citation

Jun Xia, Chen Wang, Xiaoyuan He, S. D. Tu, and J. M. Gong "Optical gage for high-temperature strain measurement by using quartz optical fiber", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429576

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