Fundamentals of Optical Interferometry for Thermal ...

OPLD = 2 u sin θ = n λ (in-plane displacement) (7) where u is the in-plane component of the displacement and 2θ is the angle between the illumination beams. For example, when θ = 18.3o. ESPI sensitivity (u/n) of 1.00 μm/fringe was achieved [27]. ................
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