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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

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Michelson interferometer based spatial phase shift shearography.

Xin Xie¹, Lianxiang Yang, Nan Xu

¹Optical Laboratory, Department of Mechanical Engineering, Oakland University, Rochester, Michigan 48309, USA.

|June 14, 2013

Summary

This summary is machine-generated.

A new spatial phase shift shearography method uses a Michelson interferometer for nondestructive testing. This technique generates a phase map from a single image, simplifying defect detection in industrial applications.

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Area of Science:

Optics and Photonics
Materials Science
Mechanical Engineering

Background:

Shearography is a valuable nondestructive testing (NDT) technique.
Michelson interferometer-based shearography is widely used in industry.
Existing methods often require complex setups or multiple images.

Purpose of the Study:

To introduce a simplified spatial phase shift shearography system.
To leverage the unique properties of a Michelson interferometer for phase shifting.
To enable single-image phase map generation for efficient NDT.

Main Methods:

A Michelson interferometer is employed as the shearing device.
Tilting a mirror in the interferometer introduces a spatial frequency shift.
Fourier transform (FT) and windowed inverse-FT are used for phase evaluation.

Main Results:

The proposed system successfully generates shearography phase maps.
Single-image acquisition simplifies the NDT process.
The effects of shearing angle, camera resolution, and filtering are analyzed.

Conclusions:

The developed spatial phase shift shearography is a simple and effective NDT tool.
This method offers a practical approach for industrial inspection.
The single-image capability enhances efficiency in defect detection.