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BOS optical system for temperature and chemiluminescence analyses in premixed flames
Applied Optics
|March 17, 2026
Summary
A novel background-oriented schlieren technique enables simultaneous temperature and chemiluminescence measurements in premixed flames. This method simplifies flame analysis and reduces computational needs for accurate flame-shape and profile reconstruction.
Area of Science:
- Combustion science
- Optical diagnostics
- Flame physics
Background:
- Accurate measurement of temperature and chemiluminescence in flames is crucial for understanding combustion processes.
- Existing optical techniques can be complex, computationally intensive, and prone to noise.
Purpose of the Study:
- To introduce a simplified background-oriented schlieren (BOS) technique for simultaneous temperature and chemiluminescence measurements.
- To develop a novel thresholding algorithm for efficient flame-shape analysis.
- To reconstruct temperature and intensity profiles in premixed flames.
Main Methods:
- Utilized a background-oriented schlieren (BOS) optical setup with a simple design.
- Developed a new, non-iterative thresholding algorithm for flame-shape analysis (height-width measurements).
- Applied Abel deconvolution to reconstruct 2D temperature and chemiluminescence intensity profiles.
Main Results:
- The BOS technique demonstrated reduced image noise and computational requirements.
- The new algorithm enabled precise flame-shape analysis.
- Temperature and intensity profiles were successfully reconstructed for liquefied petroleum gas (LPG) flames across various equivalence ratios (ϕ=0.88-1.08).
Conclusions:
- The developed BOS technique offers a simplified and efficient approach for simultaneous flame diagnostics.
- The novel thresholding algorithm enhances flame-shape analysis accuracy and speed.
- This method provides valuable data for combustion modeling and analysis.
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