
Proceedings Paper
Nondestructive three-dimensional measurement of gas temperature distribution by phase tomographyFormat | Member Price | Non-Member Price |
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Paper Abstract
This study presents a nondestructive three-dimensional (3D) measurement of gas temperature distribution around
a heater. The distribution is obtained by a coupling method of optical interferometry and computed tomography
(CT). Since the gas temperature is related to refractive index, once a series of two-dimensional (2D) phase
modulation that is an integral of refractive index along an optical path is obtained, the 3D gas temperature
distribution can be ideally determined in the same way as the widely-used CT to determine a distribution of
attenuation factor. However, the series of 2D phase images is not complete; phase images from certain directions
cannot be obtained because of limitations of the measurement system. Furthermore, the 2D images of phase
modulation are not observed directly, since the interferometer can only detect a 2D image of intensity distribution
called fringe pattern. To retrieve the phase modulation from the fringe pattern, both digital holography and
phase unwrapping algorithm are applied. To obtain 3D gas temperature distributions with such incomplete data
sets, we apply a method using localized compensator for phase unwrapping algorithm to obtain 2D modulation
maps, and a maximum-likelihood tomography for a 3D reconstruction. Accuracy of each method is compared
with that of conventional methods.
Paper Details
Date Published: 10 February 2012
PDF: 9 pages
Proc. SPIE 8296, Computational Imaging X, 829617 (10 February 2012); doi: 10.1117/12.908322
Published in SPIE Proceedings Vol. 8296:
Computational Imaging X
Charles A. Bouman; Ilya Pollak; Patrick J. Wolfe, Editor(s)
PDF: 9 pages
Proc. SPIE 8296, Computational Imaging X, 829617 (10 February 2012); doi: 10.1117/12.908322
Show Author Affiliations
Satoshi Tomioka, Hokkaido Univ. (Japan)
Shusuke Nishiyama, Hokkaido Univ. (Japan)
Published in SPIE Proceedings Vol. 8296:
Computational Imaging X
Charles A. Bouman; Ilya Pollak; Patrick J. Wolfe, Editor(s)
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