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Optical configuration for measurement in speckle interferometry.

R S Sirohi, N K Mohan, T Santhanakrishnan

|November 3, 2009

Summary

This study introduces a novel optical method for measuring in-plane displacement and object contour. The technique achieves high accuracy even with significant deformations and tilts due to slow decorrelation, extending measurement capabilities.

Area of Science:

Optical Metrology
Experimental Mechanics
Surface Analysis

Background:

Accurate measurement of in-plane displacement and surface contour is crucial in various engineering fields.
Existing optical methods often face limitations with large deformations or tilts due to signal decorrelation.

Purpose of the Study:

To report a new optical configuration for measuring in-plane displacement and object contour.
To demonstrate a method that overcomes limitations of decorrelation in optical measurements.

Main Methods:

An optical setup viewing object points symmetrically with respect to the surface normal.
Coherent combination of beams at the image plane using small apertures.
Utilizing low decorrelation properties for fringe generation.

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Main Results:

Successfully obtained interference fringes for large in-plane deformations.
Demonstrated fringe visibility for substantial angular tilts.
Achieved a method with slow decorrelation, enhancing measurement range.

Conclusions:

The developed optical configuration is simple to implement and versatile.
The method offers a wide range of adjustable sensitivity.
This technique significantly extends the measurement capabilities for displacement and contouring.