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


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.


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.


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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

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