Optical extensometer based on the common lens and modified field-of-view splitting technique
Although optical extensometers based on telecentric lens have the advantages of high strain measurement accuracy,the shortcomings of high cost and fixed field of view(FOV)of telecentric lenses make the extensometer less flexible.Therefore,an optical extensometer based on a low-cost common lens and improved FOV-splitting technique was proposed.This method took the points on the centerline of two independent fields of view as the gauge points,which not only reduced the influence of the rigid-body displacement on the strain of the measurement direction,but also effectively increased the gauge length of the extensometer.Static experiments and uniaxial tensile experiments of a stainless-steel specimen were carried out to verify the feasibility and measurement accuracy of the optical extensometer,and the root mean square error(RMSE)of the experimental results was approximately 5με,indicating that the improved optical extensometer has high strain measurement accuracy.
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