Ultrahigh-frame-rate OH Fluorescence Imaging in Turbulent Flames using a Burst-Mode Optical Parametric Oscillator

Abstract

Burst-mode planar laser-induced fluorescence (PLIF) imaging of the OH radical is demonstrated in laminar and turbulent hydrogen-air diffusion flames with pulse repetition rates up to 50 kHz. Nearly 1 mJ/pulse at 313.526 nm is used to probe the OH P210 rotational transition in the (0,0) band of the A-X system. The UV radiation is generated by a high-speed-tunable, injection-seeded optical parametric oscillator pumped by a frequency-doubled megahertz-rate burst-mode Nd:YAG laser. Preliminary kilohertz-rate wavelength scanning of the temperature-broadened OH transition during PLIF imaging is also presented for the first time (to our knowledge), and possible strategies for spatiotemporally resolved planar OH spectroscopy are discussed. 2009 Optical Society of America

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2009
Accession Number
ADA532904

Entities

People

  • James. R. Gord
  • Joseph D. Miller
  • Mikhail N Slipchenko
  • Naibo Jiang
  • Terrence R Meyer
  • Walter R. Lempert

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Combustion
  • Distributed Feedback Lasers
  • Flames
  • Fluorescence
  • Frequency
  • Laser Applications
  • Laser Induced Fluorescence
  • Lasers
  • Measurement
  • Mechanical Engineering
  • Oscillators
  • Radiation
  • Repetition Rate
  • Waveform Generators
  • Waveplates

Fields of Study

  • Physics

Readers

  • Aerospace Propulsion Engineering.
  • Combustion science or combustion engineering.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy