Abstract
Synchronous measurement of the temperature and deformation fields of large-scale flat specimens is challenging in engineering experiments, especially for high-temperature environment where the non-contact optical method is attempted. To overcome this difficulty of large-scale flat specimens tested at high temperature in the open arc wind tunnel environment, measurement principles and experiments of large-scale flat specimens based on a multi-camera system are proposed using digital image stitching as well as the improved two-color method for temperature measurement. First, the digital image mosaic method is used to process and evaluate the mosaic effect of multi-camera images, the optimal mosaic parameters are selected, and the calculation results are given. Second, a set of images for large-scale flat specimens are deduced based on an improved two-color method of temperature measurement and digital image mosaic algorithms. A stitching algorithm for full-field temperature measurement and calculation results are given. Finally, full-field displacement of the stitched images is calculated by the digital image correlation method. Synchronous measurement of temperature and deformation established in this paper provides guidance for measurement of large-scale flat specimens with high spatial resolution in engineering tests.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Long Sun, Chen Tang, Min Xu, and Zhenkun Lei
Appl. Opt. 61(22) G28-G37 (2022)
Bin Chen, Lei Ji, and Bing Pan
Appl. Opt. 59(13) 4008-4015 (2020)
Yunlong Tang, Mengkun Yue, Xufei Fang, and Xue Feng
Appl. Opt. 58(25) 6966-6974 (2019)