An electronic speckle shearing phase-shifting pattern interferometer (ESSPPI)based on Michelson interferometer was based in this paper. A rotatable mirrordriven by a step motor in one of its reflective arm is used to generate anadjustable shearing and the mirror driven by piezoelectric transducer (PZT) inthe other reflective arm was used to realize phaseshifting. In the experiments,the deformation of an aluminum plate with the same extern-force on differentpositions and different forces on the same position is measured. Meanwhile, thephase distribution and phase-unwrap image of the aluminum plate with theextern-force on its center position is obtained by the four-step phase-shiftingmethod.
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