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- W2039401770 abstract "Combustion diagnostics is an important field of research. Efforts are underway in various laboratories to develop a noninvasive technique that can yield absolute concentrations (that is, without the need for calibration against a standard sample) of minority combustion species with high temporal and spatial resolution. Fluorescence techniques are plagued by the problem of quenching collisions. On the other hand, photothermal technique relies on quenching collisions to transfer optical energy to the thermal (rotational–translational) modes of the molecules. Therefore, photothermal deflection spectroscopy (PTDS) is ideally suited for a high-quenching-rate environment, such as combustion. If the quenching rates are much faster than radiative rates, as they generally are in a combustion environment, PTDS offers an opportunity to measure absolute concentration. Temporal resolution is achieved by using pulsed laser excitation and spatial resolution is achieved by crossing the pump and probe beams at a relatively large angle. Our experiments have been conducted in a methane–oxygen flame. OH molecules were excited on the Q1 (8) rotational line at 309.24 nm by radiation from a frequency-doubled pulsed dye laser. Deflection of a He–Ne laser probe beam caused by the photothermal effect was observed. Various effects, which are important in the analysis of the signal for absolute concentration measurement, for example, OH absorption and laser spectral profiles, optical saturation, and spatial profile of the pump laser are thoroughly investigated and will be discussed." @default.
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- W2039401770 date "2003-01-01" @default.
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- W2039401770 title "Measurement of absolute OH concentration in a flame by photothermal deflection spectroscopy (abstract)" @default.
- W2039401770 doi "https://doi.org/10.1063/1.1521533" @default.
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