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 the Q1 branch of the A2∑-X2∏(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.
Original language | English |
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Pages (from-to) | 37-43 |
Number of pages | 7 |
Journal | Applied Physics B: Lasers and Optics |
Volume | 59 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jul 1994 |
MoE publication type | A1 Journal article-refereed |
Keywords
- 42.65
- 82.40