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Simple phase-shifting lateral shearing interferometer.

Emilia Mihaylova1, Maurice Whelan, Vincent Toal

  • 1Centre for Industrial and Engineering Optics, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland. emilia.mihaylova@dit.ie

Optics Letters
|June 24, 2004
PubMed
Summary
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A novel phase-shifting electronic speckle pattern shearing interferometer uses simple glass plates for shear. This low-cost, flexible system offers a straightforward approach to interferometry.

Area of Science:

  • Optics and Photonics
  • Interferometry
  • Metrology

Background:

  • Electronic speckle pattern shearing interferometry (ESPI) is a powerful technique for measuring surface deformation and strain.
  • Traditional ESPI systems often involve complex shearing devices, increasing cost and setup complexity.

Purpose of the Study:

  • To propose a new, simplified phase-shifting electronic speckle pattern shearing interferometer.
  • To demonstrate a low-cost and flexible interferometric system using readily available components.

Main Methods:

  • The proposed interferometer utilizes two partially reflective glass plates to introduce shear.
  • The shear amount is controlled by adjusting the distance between the glass plates.
  • Reflection coefficients of 0.3 and 0.7 are specified for the glass plate coatings.

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Main Results:

  • The developed system provides a simple and effective method for phase-shifting ESPI.
  • The design is inherently flexible, allowing for adjustable shear.
  • The use of basic optical components results in a low-cost implementation.

Conclusions:

  • The proposed simple shearing device offers a viable and cost-effective alternative for phase-shifting ESPI.
  • This new interferometric system is suitable for various applications requiring precise surface measurements.