Design and experiment of electronic speckle shearing phase-shifting pattern interferometer

TL;DR

This paper presents the design and experimental validation of an electronic speckle shearing phase-shifting pattern interferometer (ESSPPI) based on a Michelson setup, capable of measuring deformation and phase distribution of materials.

Contribution

It introduces a novel ESSPPI with adjustable shearing and phase-shifting capabilities using rotatable and PZT-driven mirrors, validated through deformation measurements.

Findings

Successfully measured deformation of aluminum plates under various forces.

Obtained phase distribution and phase-unwrap images using four-step phase-shifting.

Demonstrated the interferometer's effectiveness in deformation analysis.

Abstract

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