Abstract
We introduce a novel and simple experimental arrangement for single-pulse two-dimensional temperature mapping in flames by the coherent imaging techniques, degenerate four-wave mixing and polarization spectroscopy, utilizing a dual-wavelength dye laser and a diffraction grating. Each pulse of this dye laser consists of two wavelengths which were tuned to resonance with two different rotational transitions in theQ 1 branch of theA 2 ∑−X 2 ∏(0, 0) band of the OH radical. A typical coherent imaging geometry where a sheet-shaped pump beam crossed an unfocused probe beam, was used. The two generated images of OH signal distributions were spatially separated by a diffraction grating and simultaneously detected on a single CCD chip. The two-dimensional single-pulse temperature map was extracted from these images. The precision of the methods is examined and a comparison between degenerate four-wave mixing and polarization spectroscopy is made.
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Nyholm, K., Fritzon, R. & Aldén, M. Single-pulse two-dimensional temperature imaging in flames by degenerate four-wave mixing and polarization spectroscopy. Appl. Phys. B 59, 37–43 (1994). https://doi.org/10.1007/BF01081726
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DOI: https://doi.org/10.1007/BF01081726