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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 21 — Jul. 20, 2008
  • pp: 3941–3953

Measurement uncertainty and temporal resolution of Doppler global velocimetry using laser frequency modulation

Andreas Fischer, Lars Büttner, Jürgen Czarske, Michael Eggert, and Harald Müller  »View Author Affiliations


Applied Optics, Vol. 47, Issue 21, pp. 3941-3953 (2008)
http://dx.doi.org/10.1364/AO.47.003941


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Abstract

A Doppler global velocimetry (DGV) measurement technique with a sinusoidal laser frequency modulation is presented for measuring velocity fields in fluid flows. A cesium absorption cell is used for the conversion of the Doppler shift frequency into a change in light intensity, which can be measured by a fiber coupled avalanche photo diode array. Because of a harmonic analysis of the detector element signals, no errors due to detector offset drifts occur and no reference detector array is necessary for measuring the scattered light power. Hence, large errors such as image misalignment errors and beam split errors are eliminated. Furthermore, the measurement system is also capable of achieving high measurement rates up to the modulation frequency ( 100 kHz ) and thus opens new perspectives to multiple point investigations of instationary flows, e.g., for turbulence analysis. A fundamental measurement uncertainty analysis based on the theory of Cramér and Rao is given and validated by experimental results. The current relation between time resolution and measurement uncertainty, as well as further optimization strategies, are discussed.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7060) Remote sensing and sensors : Turbulence

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: March 20, 2008
Manuscript Accepted: April 25, 2008
Published: July 17, 2008

Citation
Andreas Fischer, Lars Büttner, Jürgen Czarske, Michael Eggert, and Harald Müller, "Measurement uncertainty and temporal resolution of Doppler global velocimetry using laser frequency modulation," Appl. Opt. 47, 3941-3953 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-21-3941

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