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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 15, Iss. 9 — Sep. 1, 1998
  • pp: 2433–2439

Velocity difference measurement with a fiber-optic coupler

Yixue Du, Bruce J. Ackerson, and Penger Tong  »View Author Affiliations

JOSA A, Vol. 15, Issue 9, pp. 2433-2439 (1998)

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Two single-mode fibers collect light with the same scattered wave vector from two spatially separated regions in a sample. These regions are illuminated by a single coherent laser beam, so that the collected signals interfere when combined by means of a fiber-optic coupler, before they are directed to a photomultiplier tube. The fibers and the coupler are polarization preserving to guarantee a high signal-to-noise ratio. The measured intensity fluctuations are used to determine the velocity difference δv(L) for spatial separations L in the sample. Specifically, an intensity autocorrelation function is calculated theoretically for rigid body rotation and is tested experimentally. Experimental results span two orders of magnitude in L and agree with theoretical predictions with an error of less than 5%. This new technique will be very useful in the study of turbulent flow and particle settling dynamics.

© 1998 Optical Society of America

OCIS Codes
(030.7060) Coherence and statistical optics : Turbulence
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining

Original Manuscript: January 5, 1998
Revised Manuscript: May 8, 1998
Manuscript Accepted: April 17, 1998
Published: September 1, 1998

Yixue Du, Bruce J. Ackerson, and Penger Tong, "Velocity difference measurement with a fiber-optic coupler," J. Opt. Soc. Am. A 15, 2433-2439 (1998)

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