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Updated: Jan 30, 2026

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Flapping Soft Fin Deformation Modeling using Planar Laser-Induced Fluorescence Imaging
Published on: April 28, 2022
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Quantitative 2-D OH thermometry using spectrally resolved planar laser-induced fluorescence.
Optics Letters
|February 1, 2019
Summary
A new laser technique accurately measures temperature in flames by analyzing the spectral lines of hydroxyl radicals (OH). This advanced thermometry method provides calibration-free, detailed temperature mapping in complex combustion environments.
Area of Science:
- Chemical Physics
- Combustion Science
- Laser Diagnostics
Background:
- Accurate temperature measurement is crucial for understanding and controlling combustion processes.
- Non-uniform temperature fields in reacting flows pose challenges for traditional thermometry.
- Hydroxyl radical (OH) is a key intermediate species in combustion, offering potential for diagnostics.
Purpose of the Study:
- To present a novel, quantitative two-dimensional temperature measurement method for combustion gases.
- To enable high-fidelity and calibration-free temperature quantification in complex reacting flows.
- To demonstrate the application of the developed thermometry in methane-air flames.
Main Methods:
- Development of spectrally resolved planar laser-induced fluorescence (PLIF) thermometry.
- Utilizing a high-power, wavelength-tunable, narrow-linewidth continuous-wave (CW) laser.
- Probing the R1(11)/R1(7) line pair of the OH A2Σ+-X2Π(0,0) rovibronic band near 306.5 nm.
- Inferring temperature from fluorescence intensity ratios.
Main Results:
- Successful demonstration of quantitative two-dimensional temperature measurements.
- High-fidelity mapping of non-uniform temperature fields achieved.
- Calibration-free operation validated in preliminary tests.
- Method applied to burner-stabilized CH4-air flames.
Conclusions:
- Spectrally resolved PLIF thermometry offers a robust approach for accurate temperature measurement in combustion.
- The method's ability to quantify non-uniform temperature fields is a significant advancement.
- This technique holds promise for detailed combustion analysis and optimization.
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