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Implementation of multidirectional moiré computerized tomography: multidirectional affine calibration.

Yang Song, Jia Wang, Ying Jin

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|December 2, 2016

Summary

This summary is machine-generated.

This study introduces a new multidirectional calibration method for laser interferometric optical computed tomography (CT) systems. This technique corrects projection errors, enabling accurate 3D flow field reconstruction.

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Area of Science:

Fluid dynamics
Optical metrology
Image reconstruction

Background:

Multidirectional optical computerized tomography (CT) techniques are crucial for 3D flow field analysis.
Existing laser interferometric CT systems capture simultaneous projections but suffer from installation errors and optical element differences, leading to distorted and misaligned projections.
A multidirectional calibration is necessary to correct these errors before CT reconstruction.

Purpose of the Study:

To address the unaddressed problem of multidirectional calibration for laser interferometric CT techniques.
To develop and validate a novel calibration method for a six-directional moiré tomographic system.
To enable accurate 3D flow field reconstruction by remapping distorted projections.

Main Methods:

Design of a six-directional moiré tomographic system.
Development of a multidirectional affine calibration method tailored for moiré deflectometry.
Determination of extrinsic and intrinsic parameters for tomographic projections.

Main Results:

Successful implementation of a multidirectional affine calibration method.
Projections are remapped to a unified coordinate system, correcting for distortions and positional errors.
The calibration enables accurate 3D reconstruction of flow fields.

Conclusions:

The proposed multidirectional affine calibration method effectively resolves projection errors in laser interferometric CT.
This technique is essential for accurate 3D flow field diagnosis using moiré deflectometry.
The study provides a foundational solution for multidirectional calibration in optical CT systems.