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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 3617–3626

Large-aperture, tapered fiber–coupled, 10-kHz particle-image velocimetry

Paul S. Hsu, Sukesh Roy, Naibo Jiang, and James R. Gord  »View Author Affiliations


Optics Express, Vol. 21, Issue 3, pp. 3617-3626 (2013)
http://dx.doi.org/10.1364/OE.21.003617


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Abstract

We demonstrate the design and implementation of a fiber-optic beam-delivery system using a large-aperture, tapered step-index fiber for high-speed particle-image velocimetry (PIV) in turbulent combustion flows. The tapered fiber in conjunction with a diffractive-optical-element (DOE) fiber-optic coupler significantly increases the damage threshold of the fiber, enabling fiber-optic beam delivery of sufficient nanosecond, 532-nm, laser pulse energy for high-speed PIV measurements. The fiber successfully transmits 1-kHz and 10-kHz laser pulses with energies of 5.3 mJ and 2 mJ, respectively, for more than 25 min without any indication of damage. It is experimentally demonstrated that the tapered fiber possesses the high coupling efficiency (~80%) and moderate beam quality for PIV. Additionally, the nearly uniform output-beam profile exiting the fiber is ideal for PIV applications. Comparative PIV measurements are made using a conventionally (bulk-optic) delivered light sheet, and a similar order of measurement accuracy is obtained with and without fiber coupling. Effective use of fiber-coupled, 10-kHz PIV is demonstrated for instantaneous 2D velocity-field measurements in turbulent reacting flows. Proof-of-concept measurements show significant promise for the performance of fiber-coupled, high-speed PIV using a tapered optical fiber in harsh laser-diagnostic environments such as those encountered in gas-turbine test beds and the cylinder of a combustion engine.

© 2013 OSA

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2310) Fiber optics and optical communications : Fiber optics
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: December 19, 2012
Revised Manuscript: January 25, 2013
Manuscript Accepted: January 27, 2013
Published: February 5, 2013

Citation
Paul S. Hsu, Sukesh Roy, Naibo Jiang, and James R. Gord, "Large-aperture, tapered fiber–coupled, 10-kHz particle-image velocimetry," Opt. Express 21, 3617-3626 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-3-3617


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