A Laser Speckle Method for Measuring Displacement Field. Application to Resistance Heating Tensile Test on Steel
Strain field measurement with non intrusive techniques is needed in order to characterize the behaviour of steels at high temperatures subjected to small displacements. In this work we present a technique based on laser-produced speckles coupled with a cross-correlation cross-spectrum method. This method proves more accurate than cross-correlation for small displacements. The laser wave length used (532 nm) allows to perform strain measurements, even with heat radiation.
R.A.W. Mines and J.M. Dulieu-Barton
C. Pradille et al., "A Laser Speckle Method for Measuring Displacement Field. Application to Resistance Heating Tensile Test on Steel", Applied Mechanics and Materials, Vols. 24-25, pp. 135-140, 2010