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Optics Letters

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  • Vol. 27, Iss. 9 — May. 1, 2002
  • pp: 710–712

Common-path heterodyne laser-induced thermal acoustics for seedless laser velocimetry

Roger C. Hart, G. C. Herring, and R. Jeffrey Balla  »View Author Affiliations


Optics Letters, Vol. 27, Issue 9, pp. 710-712 (2002)
http://dx.doi.org/10.1364/OL.27.000710


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Abstract

We demonstrate the use of a novel technique for the detection of heterodyne laser-induced thermal acoustic signals that allows the construction of a highly stable seedless laser velocimeter. A common-path configuration is combined with quadrature detection to provide flow direction, to greatly improve robustness to misalignment and vibration, and to give reliable velocity measurement at low-flow velocities. Comparison with Pitot tube measurements in the free stream of a wind tunnel shows root-mean-square errors of 0.67 m/s over the 0–55-m/s velocity range.

© 2002 Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry
(280.7250) Remote sensing and sensors : Velocimetry
(350.2770) Other areas of optics : Gratings

Citation
Roger C. Hart, G. C. Herring, and R. Jeffrey Balla, "Common-path heterodyne laser-induced thermal acoustics for seedless laser velocimetry," Opt. Lett. 27, 710-712 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-9-710


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References

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  2. M. Raffel, C. E. Willert, and J. Kompenhans, Particle Image Velocimetry: A Practical Guide (Springer-Verlag, New York, 1998).
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  6. R. Hart, R. Balla, and G. Herring, Appl. Opt. 40, 965 (2001).
  7. L. Kinsler, A. Frey, A. Coppens, and J. Sanders, Fundamentals of Acoustics (Wiley, New York, 1982).
  8. R. C. Hart, R. Balla, G. C. Herring, and L. Jenkins, “Seedless laser velocimetry using heterodyne laser induced thermal acoustics,” available as ICASE Rep. No. 2001–19 at www.icase.edu.

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