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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.21093 |
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| _version_ | 1866910206751932416 |
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| author | Frangi, Bernat Monroy, Laura Moreno-Oyervides, Aldo Bonilla-Manrique, Oscar E. Rubio-Rubio, Mariano Sanchez-Sanz, Mario Martín-Mateos, Pedro |
| author_facet | Frangi, Bernat Monroy, Laura Moreno-Oyervides, Aldo Bonilla-Manrique, Oscar E. Rubio-Rubio, Mariano Sanchez-Sanz, Mario Martín-Mateos, Pedro |
| contents | Optical spectroscopy, in particular dual-comb (DC) spectroscopy, is a critical, non-invasive tool for combustion diagnostics, offering high precision and calibration-free advantages. However, its implementation remains challenging, especially in the mid-infrared region. This work presents the development of a robust DC spectroscopic system based on electro-optical (EO) frequency comb generators and difference frequency generation (DFG), specifically designed for the characterization of laboratory flames. Operating at a center wavelength of 3427.43 nm, the system utilizes a differential detection strategy to enable precise, calibration-free measurements of unburned methane ($\mathrm{CH_{4}}$) concentrations in a McKenna burner. The experimental results demonstrate an estimated detection limit of 1.1 ppm for a 1 m path length and effectively resolve spatial concentration gradients across the combustion region. Furthermore, the system's high temporal resolution allowed for the identification of dynamic combustion instabilities, including self-sustained pulsations and fuel leakage under fuel-lean conditions. These findings validate the proposed EO architecture as a flexible and highly sensitive tool for advanced flame characterization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21093 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dual-comb spectroscopy for the characterization of laboratory flames Frangi, Bernat Monroy, Laura Moreno-Oyervides, Aldo Bonilla-Manrique, Oscar E. Rubio-Rubio, Mariano Sanchez-Sanz, Mario Martín-Mateos, Pedro Optics Optical spectroscopy, in particular dual-comb (DC) spectroscopy, is a critical, non-invasive tool for combustion diagnostics, offering high precision and calibration-free advantages. However, its implementation remains challenging, especially in the mid-infrared region. This work presents the development of a robust DC spectroscopic system based on electro-optical (EO) frequency comb generators and difference frequency generation (DFG), specifically designed for the characterization of laboratory flames. Operating at a center wavelength of 3427.43 nm, the system utilizes a differential detection strategy to enable precise, calibration-free measurements of unburned methane ($\mathrm{CH_{4}}$) concentrations in a McKenna burner. The experimental results demonstrate an estimated detection limit of 1.1 ppm for a 1 m path length and effectively resolve spatial concentration gradients across the combustion region. Furthermore, the system's high temporal resolution allowed for the identification of dynamic combustion instabilities, including self-sustained pulsations and fuel leakage under fuel-lean conditions. These findings validate the proposed EO architecture as a flexible and highly sensitive tool for advanced flame characterization. |
| title | Dual-comb spectroscopy for the characterization of laboratory flames |
| topic | Optics |
| url | https://arxiv.org/abs/2512.21093 |