What is it about?
We propose a fast algorithm to extract the phase in the center of an interferogram with circular fringes obtained in a simple Michelson interferometer setup with one rough surface. The phase in the center is a linear function of the displacement of an object, which is very advantageous. It avoids the uncertainty in displacement associated with intensity measurements near a maximum or minimum. Also the direction of movement is always clear. The method used also overcomes the problems associated with speckle, unavoidable with a rough surface, common in industrial applications, when using laser as a light source. Using a large number of points in the interferogram to obtain one value largely reduces noise and also increases the accuracy. Displacement is measured with an accuracy <10 nm.
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Why is it important?
It is important for non-destructive material measurements
Perspectives
We are using this algorithm to elaborate data from the optical systems for surface texture measurements
PhD Eng. Dawid Kucharski
Politechnika Poznanska
Read the Original
This page is a summary of: Determination of the phase in the center of a circular two-beam interference pattern to determine the displacement of a rough surface, Optical Engineering, October 2018, SPIE,
DOI: 10.1117/1.oe.57.10.104101.
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