Abstract
A streaming fluid containing a bleachable fluorescent tracer is illuminated by an intense laser beam having a steep intensity profile and a wavelength suitable to induce either the fluorescence or the bleaching reaction. Providing the beam intensity is sufficiently high to bleach all the dye molecules crossing the beam, the fluorescence intensity is proportional to the rate of transport of the dye into the illuminated region. This phenomenon makes it possible to measure out two-dimensional cross-sections of complex velocity fields with microscopic spatial resolution and within fractions of a second. The measurable velocity range is limited only by the diffusion of the dye on its lower end and by the bleaching sensitivity and the available laser power on the upper end. The applicability of this principle is illustrated in the example of Bénard-Marangoni flow.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Adrian, R. J. 1983: Laser velocimetry. in: Fluid mechanics measurements (ed. Goldstein, R. J.), pp. 155–240. Washington: Hemisphere
Chehroudi, B.; Simpson, R. L. 1984: A rapidly scanning laser Doppler anemometer. J. Phys. E 17, 131–136
Elson, E. L. 1985: Fluorescence correlation spectroscopy and photobleaching recovery. In: Annual review of physical chemistry, vol. 36 (eds. Rabinovitch, B. S.; Schurr, J. M.; Strauss, H. L.), pp. 379–406. Palo Alto: Annual Reviews
Fingerson, L. M.; Freymuth, P. 1983: Thermal anemometers. In: Fluid mechanics measurements (ed. Goldstein, R. J.), pp. 155–240. Washington: Hemisphere
Hiller, B.; McDaniel, J. C.; Rea, I. C. Jr.; Hanson, R. K. 1983: Laser-induced fluorescence technique for velocity measurements in subsonic gas flows. Opt. Lett. 8, 474–476
Hiller, B.; Booman, R. A.; Hassa, C.; Hanson, R. K. 1984 Velocity visualization in gas flows using laser-induced phosphorescence of biacetyl. Rev. Sci. Instrum. 55, 1964–1967
Imamura, M.; Koizumi, M. 1955: Irreversible photobleaching of the solution of fluorescent dyes. Bull. Chem. Soc. Jpn. 28, 117–124
Meynart, R. 1982: Convective flow field measurement by speckle velocimetry. Rev. Phys. Appl. 17, 301–305
Nakatani, N.; Matsumoto, M.; Ohmi, Y.; Yamada, T. 1977: Turbulence measurement by the pulse luminescence method using a nitrogen pulse laser. J. Phys. E 10, 172–187
Ueda, M.; Kagawa, K.; Yamada, K.; Yamaguchi, C.; Herada, Y. 1982: Flow visualization of Bénard convection using bolographic interferometry. Appl. Opt. 21, 3269–3272
Velarde, M. G.; Normand, C. 1980: Convection. Sci. Am. July 1980, 79–84
Westblom, U.; Svanberg, S. 1985: Imaging measurement of flow velocities using laser-induced fluorescence. Phys. Scr. 31, 402–405
Yuan, S. W. 1970: Foundations of fluid mechanics. London: Prentice-Hall
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rička, J. Photobleaching velocimetry. Experiments in Fluids 5, 381–384 (1987). https://doi.org/10.1007/BF00264401
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00264401