Single-shot, planar infrared imaging in flames using polarization spectroscopy

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Abstract

Planar infrared visualization of species in flames is challenging due to the severe thermal radiation background and relatively weak fluorescence quantum yields from ro-vibration transitions. In this express, we report imaging of molecular species in a flame via an absorption-based coherent optical method, namely infrared polarization spectroscopy (IRPS). Single-shot, planar imaging of hydrogen fluoride (HF) has been achieved in a premixed CH4/O-2 Bunsen flame, being seeded with a small amount of SF6. The HF molecule was excited through a rovibrational transition at around 2.5 mu m, which belongs to the fundamental vibration band. High spatial resolution was guaranteed using an orthorgonal pump-probe geometry, and an effective suppression of thermal background emission was achieved owing to the coherent nature of the demonstrated two-dimensional IRPS. Other advantages, e.g. high temporal resolution and species-specificity, are also features of this laser-based technique, which make it suitable for imaging of non-fluorescent but infrared active gaseous molecules in harsh environments. (C) 2015 Optical Society of America

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  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)30414-30420
JournalOptics Express
Volume23
Issue number23
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes