Temperature measurements behind shock waves using a rapid scanning IR-diode laser

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Abstract
Temperature measurements behind shock waves are possible by applying optical methods. In the case of a thermally relaxing system it is generally difficult to measure the translational and vibrational temperatures separately and in a direct way. In the present case, a rapid scanning infrared‐diode laser has been used to study the relaxation behavior of a shock heated CO/Ar mixture. The vibrational temperature can be measured by rapid scanning over two or three adjacent rotational lines from different vibrational transitions of CO. In addition it is possible to determine the translational temperature of the gas mixture from the thermal broadening of a single highly resolved rotational absorption line. The experimentally determined vibrational and translational temperature are in reasonable agreement with the computed values based on shock speed measurements and vibrational relaxation data.

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