, Volume 53, Issue 1, pp 23-29

Temperature measurement by single-shot dual-line CARS in low-pressure flows

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Abstract

A CARS method, adapted for diagnostics in low-pressure unsteady flows is described. The technique employs two narrow-band dye lasers and a single-frequency pump laser. Single-shot rotational temperature is obtained from the ratio of the intensities of two isolated Q lines. Temperature-measurement accuracy is discussed. The advantage of referencing the CARS signals from the flow in a cell filled with the same gas is shown. Demonstrative experiments are performed using N2 at pressures of 102–103 Pa.