For sometime now, holographic interferometry (HI) has been in use as a nondestructive inspection
(NDI) tool at many manufacturing facilities. However, because of its sensitivity to external vibrations, the
technique's full potential as a quality control tool cannot be realized in total. To overcome this problem,
another technique called shearography is being explored by many. Unlike holography, shearography is
immune to environmental vibration. In this presentation, we will explore the principle behind
shearography, its applicability as an NDI tool and how it can be adapted to carry out on-site inspection.
Arun A. Aiyer, Arun A. Aiyer,
"Shearography: a potential portable on-site nondestructive evaluation inspection tool", Proc. SPIE 1212, Practical Holography IV, (1 May 1990); doi: 10.1117/12.17999; https://doi.org/10.1117/12.17999