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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 18 — Jun. 20, 2002
  • pp: 3590–3600

Superimposed noninterfering probes to extend the capabilities of phase Doppler anemometry

Fabrice Onofri, Anne Lenoble, and Stefan Radev  »View Author Affiliations


Applied Optics, Vol. 41, Issue 18, pp. 3590-3600 (2002)
http://dx.doi.org/10.1364/AO.41.003590


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Abstract

We propose using multiple superimposed noninterfering probes (SNIPs) of the same wavelength but different beam angles to extend the capabilities of phase Doppler anemometry. When a particle is moving in a SNIP the Doppler signals that are produced exhibit multiple Doppler frequencies and phase shifts. The resolution of the measurements of particle size (i.e., by fringe spacing and Doppler frequency) increases with beam angle. Then, with the solution proposed, even with only two detectors several measurements of size can be obtained for the same particle with increasing resolution if we consider higher frequencies in the signal. Several optical solutions to produce SNIPs as well as a signal-processing algorithm to treat the multiple-frequency Doppler signals are proposed. Experimental validations of the sizing of spherical and cylindrical particles demonstrate the applicability of this technique for particle measurement. We believe that this new technique can be of great interest when high resolution of size, velocity, and even refractive index is required.

© 2002 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.3340) Remote sensing and sensors : Laser Doppler velocimetry
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: May 31, 2001
Revised Manuscript: January 29, 2002
Published: June 20, 2002

Citation
Fabrice Onofri, Anne Lenoble, and Stefan Radev, "Superimposed noninterfering probes to extend the capabilities of phase Doppler anemometry," Appl. Opt. 41, 3590-3600 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-18-3590

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