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|Title: ||Effects of random vibration in high-speed phase-shifting speckle pattern interferometry|
|Authors: ||Ruiz, Pablo D.|
Huntley, Jonathan M.
Coggrave, Charles R.
Kaufmann, Guillermo H.
|Issue Date: ||2002|
|Publisher: ||© Optical Society of America|
|Citation: ||RUIZ, P.D. ... et al, 2002. Effects of random vibration in high-speed phase-shifting speckle pattern interferometry. Applied Optics, 14 (19), pp. 3941-3949.|
|Abstract: ||The influence of random vibrations on a dynamic phase shifting speckle
pattern interferometer, in which phase difference evaluation is performed using
temporal phase shifting and temporal phase unwrapping, is investigated by means of
experiments and numerical simulations. A well-defined velocity spectral density
function, typical of the spectra found under non-vibration-isolated conditions, is used
throughout. Five phase-shifting formulae are studied, with camera framing rates (1,2
and 4 kHz) typical of current dynamic speckle pattern interferometers. Two main
aspects were evaluated: firstly the unwrapping reliability, and secondly the noise
induced in the phase maps by the vibration. The former was found to be a significant
constraint, even for peak velocities well below the Nyquist velocity limit of the
interferometer, and is therefore likely to be more important than the latter in many
applications. Three analytical criteria for determining the expected unwrapping
success rate are proposed and their predictions compared with the measured values.
It is demonstrated that shorter sampling windows and higher framing rates are
preferred in order to increase the unwrapping success rate, but that longer windows
reduce the root mean square error in the phase change maps due to the vibration.|
|Description: ||This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-19-3941. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.|
|Version: ||Accepted for publication|
|Appears in Collections:||Published Articles (Mechanical, Electrical and Manufacturing Engineering)|
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