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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1714–1732

Raman line imaging for spatially and temporally resolved mole fraction measurements in internal combustion engines

Paul C. Miles  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1714-1732 (1999)
http://dx.doi.org/10.1364/AO.38.001714


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Abstract

An optical diagnostic system based on line imaging of Raman-scattered light has been developed to study the mixing processes in internal combustion engines. The system permits multipoint, single laser-shot measurements of CO2, O2, N2, C3H8, and H2O mole fractions with submillimeter spatial resolution. Selection of appropriate system hardware is discussed, as are subsequent data reduction and analysis procedures. Results are reported for data obtained at multiple crank angles and in two different engine flow fields. Measurements are made at 12 locations simultaneously, each location having measurement volume dimensions of 0.5 mm × 0.5 mm × 0.9 mm. The data are analyzed to obtain statistics of species mole fractions: mean, rms, histograms, and both spatial and cross-species covariance functions. The covariance functions are used to quantify the accuracy of the measured rms mole fraction fluctuations, to determine the integral length scales of the mixture inhomogeneities, and to quantify the cycle-to-cycle fluctuations in bulk mixture composition under well-mixed conditions.

© 1999 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(280.2490) Remote sensing and sensors : Flow diagnostics
(290.5860) Scattering : Scattering, Raman

History
Original Manuscript: April 24, 1998
Revised Manuscript: November 9, 1998
Published: March 20, 1999

Citation
Paul C. Miles, "Raman line imaging for spatially and temporally resolved mole fraction measurements in internal combustion engines," Appl. Opt. 38, 1714-1732 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1714

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