Video extensometer
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A video extensometer is a device that is capable of performing stress/strain measurements using video frames. The specimen under test is marked with special markers (usually special stickers or with pens) and the distance between these markers are constantly tracked, while the speciemn is stretched. With a proper calibration value and good image processing algorithms, resolution of less than 1micron can be achieved. Video extensometer is used majorly for materials which are complicated to test. Nowadays it is widely replacing mechanical measurement units for some applications due to ease of use and convenience.
