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Applied Optics

Applied Optics


  • Vol. 39, Iss. 33 — Nov. 20, 2000
  • pp: 6221–6229

Imaging of droplets and vapor distributions in a Diesel fuel spray by means of a laser absorption–scattering technique

Yu-yin Zhang, Takuo Yoshizaki, and Keiya Nishida  »View Author Affiliations

Applied Optics, Vol. 39, Issue 33, pp. 6221-6229 (2000)

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The droplets and vapor distributions in a fuel spray were imaged by a dual-wavelength laser absorption–scattering technique. 1,3-dimethylnaphthalene, which has physical properties similar to those of Diesel fuel, strongly absorbs the ultraviolet light near the fourth harmonic (266 nm) of a Nd:YAG laser but is nearly transparent to the visible light near the second harmonic (532 nm) of a Nd:YAG laser. Therefore, droplets and vapor distributions in a Diesel spray can be visualized by an imaging system that uses a Nd:YAG laser as the incident light and 1,3-dimethylnaphthalene as the test fuel. For a quantitative application consideration, the absorption coefficients of dimethylnapthalene vapor at different temperatures and pressures were examined with an optical spectrometer. The findings of this study suggest that this imaging technique has great promise for simultaneously obtaining quantitative information of droplet density and vapor concentration in Diesel fuel spray.

© 2000 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.7000) Instrumentation, measurement, and metrology : Transmission
(280.2490) Remote sensing and sensors : Flow diagnostics
(290.5850) Scattering : Scattering, particles

Original Manuscript: February 16, 2000
Revised Manuscript: July 20, 2000
Published: November 20, 2000

Yu-yin Zhang, Takuo Yoshizaki, and Keiya Nishida, "Imaging of droplets and vapor distributions in a Diesel fuel spray by means of a laser absorption–scattering technique," Appl. Opt. 39, 6221-6229 (2000)

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