Advertisement

Experiments in Fluids

, Volume 7, Issue 7, pp 435–440 | Cite as

An improved laser-Rayleigh scattering photodetection system

  • D. R. Dowling
  • D. B. Lang
  • P. E. Dimotakis
Originals

Abstract

An improved photodetection system for high resolution laser-Rayleigh scattering measurements has been developed that utilizes a solid state detector coupled to a custom-designed, low-noise, transimpedance amplifier. The resulting system, based on a PIN photodiode is less expensive, inherently safer, less delicate and, depending on the detected light level, may exhibit higher signal-to-noise ratios than photodetection systems based on photomultiplier tubes. The frequency response of the system was designed to be uniform (3% peak variation) from DC to nearly 100 kHz. Concentration fluctuation spectra of a high scattering cross-section label (jet fluid) gas discharging into a density-matched, low scattering cross-section quiescent reservoir gas were measured using this system. Spectral signal-to-noise ratios as high as 7 decades were achieved under some conditions in parts of the spectrum.

Keywords

High Resolution Solid State Frequency Response Light Level Photomultiplier Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Arcoumanis, C. 1985: A laser Rayleigh scattering system for scalar transport studies. Exp. Fluids 3, 103–108Google Scholar
  2. Dibble, R. W.; Hollenbach, R. E. 1980: Laser Rayleigh thermometry in turbulent flames. In: 18th Int. Symp. Combustion, pp. 1489–1499. The Combustion InstituteGoogle Scholar
  3. Dowling, D. R. 1988: Mixing in gas phase turbulent jets. Ph. D. Thesis, California Institute of TechnologyGoogle Scholar
  4. Dowling, D. R.; Dimotakis, P. E. 1988: On mixing and structure of the concentration field of turbulent Jets. In: Proc. 1st Nat. Fluid Dyn. Cong. Vol. 2, pp. 982–988 Cincinatti: A.I.AA.Google Scholar
  5. Dyer, T. M. 1979: Rayleigh scattering measurements of timeresolved concentration in a turbulent propane jet. AIAA J. 17, 912–914Google Scholar
  6. Engstrom, R. W. 1980: Photomultiplier handbook. Lancaster: RCA CorporationGoogle Scholar
  7. Escoda, M. C.; Long, M. B. 1983: Rayleigh scattering mesurements of the gas concentration field in turbulent jet. AIAA J. 21, 81–84Google Scholar
  8. Graham, A. J.; Grant, A. J.; Jones, J. M. 1974: Transient molecular concentration measurements in turbulent flows using Rayleigh light scattering. AIAA J. 21, 1140–1142Google Scholar
  9. Haumann, J.; Wu, G.; Leipertz, A. 1987: Low power laser Rayleigh probe for mixing studies. Exp. Fluids 5, 230–234Google Scholar
  10. Jackson, J. D. 1975: Classical electrodynamics 2nd edn. New York: WileyGoogle Scholar
  11. Lang, D. B. 1985: Laser doppler velocity and vorticity measurements in turbulent shear layers. Ph. D. Thesis. California Institute of TechnologyGoogle Scholar
  12. McCartney, E. J. 1976: Optics of the atmosphere. New York: WileyGoogle Scholar
  13. Namazian, M.; Schefer, R. W.; Kelly, J. 1987: Sandia Report No. SAND 87–8652 Comb. Flame (in press)Google Scholar
  14. Niwa, C.; Ichizawa, J.; Yoshikawa, N.; Ohtake, K. 1984: Timeresolved concentration measurements of jets by laser Rayleigh method. In: Proc. 14th Int. Symp. Space Technology Science, pp. 469–476. TokyoGoogle Scholar
  15. Pitts, W. M. 1986: Effects of global density and Reynolds number variations on mixing in turbulent axisymmetric jets. NBS Report No. NBSIR 86–3340Google Scholar
  16. Pitts, W. M.; Kashiwagi, T. 1983: The application of laser-induced Rayleigh light scattering to the study of turbulent mixing. NBSIR 83–2641Google Scholar
  17. Pitts, W. M.; Kashiwagi, T. 1984: The application of laser-induced Rayleigh light scattering to the study of turbulent mixing. J. Fluid Mech. 141, 391–429CrossRefPubMedGoogle Scholar
  18. Robben, F. 1971: Noise in the measurement of light with photomultipliers. Appl. Optics 10, 776–796Google Scholar
  19. Wiener, N. 1949: Extrapolation, interpolation and smoothing of stationary time series. New York: WileyGoogle Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • D. R. Dowling
    • 1
  • D. B. Lang
    • 1
  • P. E. Dimotakis
    • 1
  1. 1.Graduate Aeronautical Laboratories, California Institute of TechnologyPasadenaUSA

Personalised recommendations