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High-speed CH planar laser-induced fluorescence imaging using a multimode-pumped optical parametric oscillator
Joseph D Miller1, Sascha R Engel, Terrence R Meyer
1Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA.
Optics Letters
|October 4, 2011
Summary
This study introduces high-speed CH planar laser-induced fluorescence (PLIF) imaging for turbulent diffusion flames. It achieves high signal-to-noise ratios, advancing flame diagnostics.
Area of Science:
- Combustion science
- Laser diagnostics
- Fluid dynamics
Background:
- Turbulent diffusion flames are critical in many industrial applications.
- Accurate flame diagnostics are essential for understanding and controlling combustion processes.
- High-speed imaging techniques are needed to capture transient flame dynamics.
Purpose of the Study:
- To develop and demonstrate a high-speed CH planar laser-induced fluorescence (PLIF) imaging system.
- To investigate turbulent diffusion flames with enhanced temporal resolution.
- To improve signal-to-noise ratios in CH PLIF measurements.
Main Methods:
- Utilized a multimode-pumped optical parametric oscillator (OPO) for CH radical excitation.
- Employed a Nd:YAG laser system for pumping the OPO.
- Acquired single-shot CH PLIF images at a 10 kHz repetition rate.
Main Results:
- Achieved excitation at 431.1 nm for the CH radical's A-X (0,0) band.
- Demonstrated that OPO performance metrics depend on pump passes in the ring cavity.
- Obtained signal-to-noise ratios of approximately 25-35, the highest reported for high-speed CH PLIF.
Conclusions:
- The developed high-speed CH PLIF system is effective for turbulent diffusion flame imaging.
- The system provides unprecedented signal quality for high-speed flame diagnostics.
- This technique offers a significant advancement for combustion research and engineering.
