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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 18 — Jun. 20, 2012
  • pp: 4047–4057

Investigation of optical fibers for gas-phase, ultraviolet laser-induced-fluorescence (UV-LIF) spectroscopy

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


Applied Optics, Vol. 51, Issue 18, pp. 4047-4057 (2012)
http://dx.doi.org/10.1364/AO.51.004047


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Abstract

We investigate the feasibility of transmitting high-power, ultraviolet (UV) laser pulses through long optical fibers for laser-induced-fluorescence (LIF) spectroscopy of the hydroxyl radical (OH) and nitric oxide (NO) in reacting and non-reacting flows. The fundamental transmission characteristics of nanosecond (ns)-duration laser pulses are studied at wavelengths of 283 nm (OH excitation) and 226 nm (NO excitation) for state-of-the-art, commercial UV-grade fibers. It is verified experimentally that selected fibers are capable of transmitting sufficient UV pulse energy for single-laser-shot LIF measurements. The homogeneous output-beam profile resulting from propagation through a long multimode fiber is ideal for two-dimensional planar-LIF (PLIF) imaging. A fiber-coupled UV-LIF system employing a 6 m long launch fiber is developed for probing OH and NO. Single-laser-shot OH- and NO-PLIF images are obtained in a premixed flame and in a room-temperature NO-seeded N2 jet, respectively. Effects on LIF excitation lineshapes resulting from delivering intense UV laser pulses through long fibers are also investigated. Proof-of-concept measurements demonstrated in the current work show significant promise for fiber-coupled UV-LIF spectroscopy in harsh diagnostic environments such as gas-turbine test beds.

© 2012 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

ToC Category:
Spectroscopy

History
Original Manuscript: January 5, 2012
Manuscript Accepted: April 3, 2012
Published: June 13, 2012

Citation
Paul S. Hsu, Waruna D. Kulatilaka, Naibo Jiang, James R. Gord, and Sukesh Roy, "Investigation of optical fibers for gas-phase, ultraviolet laser-induced-fluorescence (UV-LIF) spectroscopy," Appl. Opt. 51, 4047-4057 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-18-4047

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