Figure 1. Speckle effect for unloaded and loaded state with the results of subtraction

From

The Possibilities in Use of ESPI Method by Investigation of Strain Fields of Specimen with Stress Concentrator

Martin Hagara, Róbert Huňady, František Trebuňa

American Journal of Mechanical Engineering. 2016, 4(7), 429-434 doi:10.12691/ajme-4-7-36