Double-camera video frequency large-deformation measurement method and video frequency extension device based thereon
A measurement method and dual-camera technology, applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve the problems of affecting the measurement accuracy, the decrease of measurement accuracy, and the increase of the external size of the testing machine, so as to achieve the compact structure of the instrument and the production Low cost, conducive to the effect of splicing
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[0098] The present invention will be further described below in conjunction with the accompanying drawings.
[0099] The measurement range of a video extensometer depends on the viewing angle of the lens and the distance from the lens to the specimen. Due to the limitation of the viewing angle of the lens, the video extensometer must keep a certain distance from the sample to achieve a certain measurement range during operation. This requirement will not be a problem when the measurement range is not too large (figure 1 .
[0100] Assume that when the angle of view of the lens is a, its maximum measurement range is A. If a lens with the same angle of view is used, in order to expand the maximum measurement range from A to A1, the distance between the sample and the lens must be expanded from L to L1 , which poses two problems:
[0101] First, the resolution of the captured image decreases, which affects the measurement accuracy. Although higher-resolution lenses and image s...
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