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An improved laser-Rayleigh scattering photodetection system

Dowling, D. R. and Lang, D. B. and Dimotakis, P. E. (1989) An improved laser-Rayleigh scattering photodetection system. Experiments in Fluids, 7 (7). pp. 435-440. ISSN 0723-4864. doi:10.1007/BF00187060.

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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.

Item Type:Article
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Additional Information:© 1989 Springer-Verlag.
Issue or Number:7
Record Number:CaltechAUTHORS:20160602-174109500
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67614
Deposited By: Paul Dimotakis
Deposited On:06 Jun 2016 21:23
Last Modified:11 Nov 2021 03:51

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