title: Vibration detection using focus analysis of interferograms.
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.
authors.affiliation: National Institute of Physics, University of the Philippines, Quezon City 1101, Philippines. jaelordcf@gmail.com
authors.forename: Jae Lord Dexter C
authors.initials: JL
authors.lastname: Filipinas
authors.forename: Percival F
authors.initials: PF
authors.lastname: Almoro