Measurement of vibrational and rotational temperatures behind strong shock waves by nonlinear spectroscopic methods like CARS

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In the re-entering phase of space vehicle into the atmosphere strong shock wave is generated, and non-equilibrium, radiating high enthalpy flow is generated behind the shock wave. Together with the convecting heat transfer, the radiative and non-equilibrium heating from the shocked air plays an important role on the total heat flux to the vehicle. This research treats nonlinear spectroscopic measurement on the vibrational/rotational temperatures of nitrogen behind the hypervelocity shock waves from 4-7km/s by CARS method. The CARS spectroscopic signals are successfully observed by free-piston, double-diaphragm shock tube experiments, and the measured results are compared with simulated spectra to decide the temperatures by spectral matching method.