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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 31 — Nov. 1, 2005
  • pp: 6578–6592

Toward in-cylinder absorption tomography in a production engine

Paul Wright, Charles A. Garcia-Stewart, Stephen J. Carey, Francis P. Hindle, Stephen H. Pegrum, Stephen M. Colbourne, Paul J. Turner, William J. Hurr, Tim J. Litt, Stuart C. Murray, Sam D. Crossley, Krikor B. Ozanyan, and Hugh McCann  »View Author Affiliations

Applied Optics, Vol. 44, Issue 31, pp. 6578-6592 (2005)

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Design requirements for an 8000 frame/s dual-wavelength ratiometric chemical species tomography system, intended for hydrocarbon vapor imaging in one cylinder of a standard automobile engine, are examined. The design process is guided by spectroscopic measurements on iso-octane and by comprehensive results from laboratory phantoms and research engines, including results on temporal resolution performance. Novel image reconstruction techniques, necessary for this application, are presented. Recent progress toward implementation, including details of the optical access arrangement employed and signal-to-noise issues, is described. We present first cross-cylinder IR absorption measurements from a reduced channel-count (nontomographic) system and discuss the prospects for imaging.

© 2005 Optical Society of America

OCIS Codes
(100.6950) Image processing : Tomographic image processing
(110.3080) Imaging systems : Infrared imaging
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.6260) Spectroscopy : Spectroscopy, diode lasers

Original Manuscript: March 22, 2005
Revised Manuscript: July 8, 2005
Manuscript Accepted: July 16, 2005
Published: November 1, 2005

Paul Wright, Charles A. Garcia-Stewart, Stephen J. Carey, Francis P. Hindle, Stephen H. Pegrum, Stephen M. Colbourne, Paul J. Turner, William J. Hurr, Tim J. Litt, Stuart C. Murray, Sam D. Crossley, Krikor B. Ozanyan, and Hugh McCann, "Toward in-cylinder absorption tomography in a production engine," Appl. Opt. 44, 6578-6592 (2005)

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