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Updated: May 23, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Vibration detection using focus analysis of interferograms
Jae Lord Dexter C Filipinas1, Percival F Almoro
1National Institute of Physics, University of the Philippines, Quezon City 1101, Philippines. jaelordcf@gmail.com
Abstract:
This paper proposed an automated technique for vibration detection using statistical focus measure to evaluate interferogram contrast. An interferogram sequence from a Mach-Zehnder interferometer setup is recorded (frame rate: 24 fps) and the gray-level variance (GLVA) is plotted versus time. Occurrence of induced vibration in the setup causes a decrease in the interferogram contrast which, in turn, manifests as an evident rapid drop in the variance plot. The technique is demonstrated experimentally using periodic microvibrations (frequency range, ≤6 Hz) and aperiodic disturbances.
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