Circular gratings' moiré effect for projection measurement in volume optical computerized tomography with two-step phase-shifting method

Jia Wang; Yang Song; Zhen-hua Li; An-zhi He

doi:10.1117/12.999801

4 December 2012 Circular gratings' moiré effect for projection measurement in volume optical computerized tomography with two-step phase-shifting method

Jia Wang, Yang Song, Zhen-hua Li, An-zhi He

Author Affiliations +

Proceedings Volume 8563, Optical Metrology and Inspection for Industrial Applications II; 85630F (2012) https://doi.org/10.1117/12.999801
Event: Photonics Asia, 2012, Beijing, China

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.

Citation Download Citation

Jia Wang, Yang Song, Zhen-hua Li, and An-zhi He "Circular gratings' moiré effect for projection measurement in volume optical computerized tomography with two-step phase-shifting method", Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85630F (4 December 2012); https://doi.org/10.1117/12.999801

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KEYWORDS

Phase shifts

Wavefronts

Computed tomography

Tomography

Optical coherence tomography

Optical filters

Optical tomography

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