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Implementation of a speckle-correlation-based optical lever with extended dynamic range

A. Vijayakumar, D. Jayavel, M. Muthaiah, Shanti Bhattacharya, and Joseph Rosen

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Abstract

A speckle-correlation-based optical lever (SC-OptLev) is constructed for the measurement of small changes in the orientation angle of a surface. The dynamic range of SC-OptLev is found to be twice that of a conventional OptLev for the same experimental configurations. Different filtering mechanisms are implemented, and the correlation results are compared. Two types of computer-automated SC-OptLevs, an open-source-based computing system with a low-cost image sensor and a commercial computing system, are presented with assistive computational modules.

© 2019 Optical Society of America

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Supplementary Material (8)

NameDescription
Code 1       Octave code for implementing matched filter, phase-only filter and non-linear filter.
Code 2       MATLAB code for implementing Wiener filter and Lucy-Richardson filter.
Code 3       Code for building dependencies for Octave image acquisition,capturing the speckle motion using a web camera, and displayingin real-time the motion of the correlation peak,saving it as a video clip.
Code 4       Peak detection and tilt angle calculation.
Code 5       Image acquisition with MATLAB and capturing the speckle motion using a web camera and displayingin real-time the motion of the correlation peak,saving it as a video clip.
Visualization 1       Video clip of the motion of the correlation peak when the mirror was tilted and the recorded frames were not zero padded. (Octave)
Visualization 2       Video clip of the motion of the correlation peak when the mirror was tilted and the recorded frames were zero padded. (Octave)
Visualization 3       Video clip of the motion of the correlation peak when the mirror was tilted and the recorded frames were not zero padded. (MATLAB)

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