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Abstract：
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The contact extensor is often used in metallic strain measurement,however,it has some defects such as it can not be used to test strain of a high temperature part,soft materials and whole process of metallic tensile test.To avoid these defects,using elliptic fitting technique,a non-contact real-time measurement system based on grid strain was established.The system wes developed and successfully applied to metallic tension to get the real-time measurement of length and width strain.Result shows that this method can replace the conventional method of using contact extensor to some degree and the measuring precision is up to ±5%,which can meet the practical requirement.
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Reference：
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