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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 33 — Nov. 20, 1996
  • pp: 6548–6559

Laser-induced incandescence: detection issues

Randall L. Vander Wal  »View Author Affiliations


Applied Optics, Vol. 35, Issue 33, pp. 6548-6559 (1996)
http://dx.doi.org/10.1364/AO.35.006548


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Abstract

Theoretical predictions suggest that soot particle size and local gas temperature affect both the spectral intensity and the temporal evolution of laser-induced incandescence. A discussion of both the physical structure and the theoretical absorption models of soot aggregates is presented, suggesting that the soot particle size relevant to laser-induced incandescence (LII) is the primary particle size regardless of whether the primary particle exists individually or is assembled into an aggregate. Experimental results of LII measurements in a laminar gas-jet flame with different signal collection strategies for the LII are presented. These results suggest that (a) signal integration during the laser pulse is essential for minimizing particle size and local temperature bias in the LII signal, (b) signal integration times subsequent to the laser pulse produce a size and local gas-temperature-dependent bias in the LII signal with long integration times more sensitive to these effects, and (c) long wavelength detection produces less of a size and local gas-temperature-dependent bias than short wavelength detection.

© 1996 Optical Society of America

History
Original Manuscript: December 18, 1995
Revised Manuscript: May 21, 1996
Published: November 20, 1996

Citation
Randall L. Vander Wal, "Laser-induced incandescence: detection issues," Appl. Opt. 35, 6548-6559 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-33-6548


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