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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1444–1451

Cavity ringdown and laser-induced incandescence measurements of soot

Randy L. Vander Wal and Thomas M. Ticich  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1444-1451 (1999)
http://dx.doi.org/10.1364/AO.38.001444


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Abstract

Currently laser-induced incandescence (LII) is widely used for the measurement of soot volume fraction. A particularly important aspect of the technique that has received less attention, however, is calibration. The applicability of cavity ringdown (CRD) for measurement of soot volume fraction f v is assessed, and the calibration of LII by means of CRD is demonstrated. The accuracy of CRD for f v determination is validated by comparison with traditional light extinction and path-integrated LII. By use of CRD, the quantification of LII for parts in 109 (ppb) f v levels is demonstrated. Results are presented that demonstrate the accuracy of CRD for a single laser pulse to be better than ±5% for measurement of ppb soot volume-fraction levels over a 1-cm path length. By use of CRD, spatially resolved LII signals from soot within methane–air diffusion flames are calibrated for ppb f v levels, thereby avoiding the extrapolation required of less sensitive methods in current use.

© 1999 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.1030) Spectroscopy : Absorption

History
Original Manuscript: March 24, 1998
Revised Manuscript: October 15, 1998
Published: March 20, 1999

Citation
Randy L. Vander Wal and Thomas M. Ticich, "Cavity ringdown and laser-induced incandescence measurements of soot," Appl. Opt. 38, 1444-1451 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1444


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References

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