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Optical Engineering

Camera calibration for multidirectional flame chemiluminescence tomography
Author(s): Jia Wang; Weiguang Zhang; Yuhong Zhang; Xun Yu
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Paper Abstract

Flame chemiluminescence tomography (FCT), which combines computerized tomography theory and multidirectional chemiluminescence emission measurements, can realize instantaneous three-dimensional (3-D) diagnostics for flames with high spatial and temporal resolutions. One critical step of FCT is to record the projections by multiple cameras from different view angles. For high accuracy reconstructions, it requires that extrinsic parameters (the positions and orientations) and intrinsic parameters (especially the image distances) of cameras be accurately calibrated first. Taking the focus effect of the camera into account, a modified camera calibration method was presented for FCT, and a 3-D calibration pattern was designed to solve the parameters. The precision of the method was evaluated by reprojections of feature points to cameras with the calibration results. The maximum root mean square error of the feature points’ position is 1.42 pixels and 0.0064 mm for the image distance. An FCT system with 12 cameras was calibrated by the proposed method and the 3-D CH* intensity of a propane flame was measured. The results showed that the FCT system provides reasonable reconstruction accuracy using the camera’s calibration results.

Paper Details

Date Published: 23 November 2016
PDF: 7 pages
Opt. Eng. 56(4) 041307 doi: 10.1117/1.OE.56.4.041307
Published in: Optical Engineering Volume 56, Issue 4
Show Author Affiliations
Jia Wang, Xi'an Technological Univ. (China)
Nanjing Univ. of Science and Technology (China)
Weiguang Zhang, Xi'an Technological Univ. (China)
Yuhong Zhang, Xi'an Technological Univ. (China)
Xun Yu, Xi'an Technological Univ. (China)

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