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Proceedings Paper

Circular gratings' moiré effect for projection measurement in volume optical computerized tomography with two-step phase-shifting method
Author(s): Jia Wang; Yang Song; Zhen-hua Li; An-zhi He
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Paper Abstract

Volume optical computerized tomography (VOCT), which can realize real 3D measurement rather than traditional 2D OCT, has great superiority in quantitatively measuring the thermo physical parameters of transient flow field. Among the refractive index reconstruction techniques, filtered back-projection (FBP) method performs better than algebraic reconstruction techniques (ARTs) with higher accuracy and computationally efficient. In order to apply FBP to VOCT, the radial second-order derivative of projection wave front passes through the tested phase object should be obtained firstly. In this paper, a projection device with two circular gratings is established. In particular, owing to an inherent phase shift exists between moiré fringes of +1 and -1 diffraction orders, a two-step phase-shifting algorithm is utilized to extract the wave front’s radial first-order derivative which is contained in the moiré fringes. The reliability of the two-step phase-shifting algorithm is proved by a computer simulation. Finally, the radial first-order derivative of wave front passing through a propane flame is measured and retrieved by these methods.

Paper Details

Date Published: 4 December 2012
PDF: 8 pages
Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85630F (4 December 2012); doi: 10.1117/12.999801
Show Author Affiliations
Jia Wang, Nanjing Univ. of Science and Technology (China)
Yang Song, Nanjing Univ. of Science and Technology (China)
Zhen-hua Li, Nanjing Univ. of Science and Technology (China)
An-zhi He, Nanjing Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 8563:
Optical Metrology and Inspection for Industrial Applications II
Kevin G. Harding; Peisen S. Huang; Toru Yoshizawa, Editor(s)

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