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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 13 — Jun. 26, 2006
  • pp: 6011–6019

Power spectra for laser-extinction measurements

B. Lacaze and M. Chabert  »View Author Affiliations


Optics Express, Vol. 14, Issue 13, pp. 6011-6019 (2006)
http://dx.doi.org/10.1364/OE.14.006011


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Abstract

Recent laser technology provides accurate measures of the dynamics of fluids and embedded particles. For instance, the laser-extinction measurements (LEM) uses a laser beam passing across the fluid and measures the residual laser light intensity at the fluid output. The particle concentration is estimated from this measurement. However, the particle flow is submitted to random time-varying fluctuations. This study thus proposes to model the received intensity by an appropriate random process. This paper first models the particle flow by a queueing process. Second, the measured intensity power spectrum is derived according to this random model. Finally, the simple case of a constant particle velocity is developped. The proposed model allows to generalize results previously obtained in the litterature with simplified models. Moreover, the particle celerity estimate is provided.

© 2006 Optical Society of America

OCIS Codes
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 17, 2006
Revised Manuscript: June 13, 2006
Manuscript Accepted: June 14, 2006
Published: June 26, 2006

Citation
B. Lacaze and M. Chabert, "Power spectra for laser-extinction measurements," Opt. Express 14, 6011-6019 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-13-6011


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References

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  7. K. Lee, Y. Han, W. Lee, J. Chung, C. Lee, "Quantitative measurements of soot particles in a laminar diffusion flame using LII/LIS technique," Meas. Sci. Technol. 16, 519-528, (2005). [CrossRef]
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  9. M. Musculus, L. Pickett, "Diagnostic considerations for optical laser-extinction measurements of soot in highpressure transient combustion environments," Combustion and Flame, 141, 371-391, (2005). [CrossRef]
  10. A. Papoulis, Probability, Random Variables, and Stochastic Processes, McGraw-Hill, 1991.

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