Abstract
A new multiplexed system based on double imaging Mach–Zehnder interferometry is proposed in this study for the simultaneous measurement of out-of-plane deformation and its first derivative. A modified Mach–Zehnder interferometer is used in the proposed system as shearing device, which has two pairs of imaging lenses and apertures placed on its arms. Therefore, carrier frequency and shearing amount can be independently adjusted using different components. An optical fiber is used to introduce reference beam, which has orthogonal states of polarization with one of the object beams. Shearogram and hologram without cross interference can be obtained by interference with the unpolarized object beam. Experimental results are presented for two pressure-loaded circular plates.
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