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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 8 — Apr. 15, 2013
  • pp: 1197–1199

Laser velocimetry with fluorescent dye-doped polystyrene microspheres

K. Todd Lowe, Pietro Maisto, Gwibo Byun, Roger L. Simpson, Max Verkamp, Paul M. Danehy, Pacita I. Tiemsin, and Christopher J. Wohl  »View Author Affiliations

Optics Letters, Vol. 38, Issue 8, pp. 1197-1199 (2013)

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Simultaneous Mie scattering and laser-induced fluorescence (LIF) signals are obtained from individual polystyrene latex microspheres dispersed in an air flow. Microspheres less than 1 μm mean diameter were doped with two organic fluorescent dyes, Rhodamine B (RhB) and dichlorofluorescein (DCF), intended either to provide improved particle-based flow velocimetry in the vicinity of surfaces or to provide scalar flow information (e.g., marking one of two fluid streams). Both dyes exhibit measureable fluorescence signals that are on the order of 103 to 104 times weaker than the simultaneously measured Mie signals. It is determined that at the conditions measured, 95.5% of RhB LIF signals and 32.2% of DCF signals provide valid laser-Doppler velocimetry measurements compared with the Mie scattering validation rate with 6.5 W of 532 nm excitation, while RhB excited with 1.0 W incident laser power still exhibits 95.4% valid velocimetry signals from the LIF channel. The results suggest that the method is applicable to wind tunnel measurements near walls where laser flare can be a limiting factor and monodisperse particles are essential.

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(260.2510) Physical optics : Fluorescence
(300.2530) Spectroscopy : Fluorescence, laser-induced
(350.4990) Other areas of optics : Particles

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 26, 2012
Revised Manuscript: February 12, 2013
Manuscript Accepted: February 14, 2013
Published: April 1, 2013

Virtual Issues
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics

K. Todd Lowe, Pietro Maisto, Gwibo Byun, Roger L. Simpson, Max Verkamp, Paul M. Danehy, Pacita I. Tiemsin, and Christopher J. Wohl, "Laser velocimetry with fluorescent dye-doped polystyrene microspheres," Opt. Lett. 38, 1197-1199 (2013)

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