Abstract

We employ dual-probe one-dimensional (1D) femtosecond (fs)/picosecond (ps) hybrid rotational coherent anti-Stokes Raman spectroscopy (HRCARS) to investigate simultaneous temperature, pressure, and ${{\rm{O}}_2}/{{\rm{N}}_2}$ measurements for gas-phase diagnostics. The dual-probe HRCARS technique allows for simultaneous measurements from the time and frequency-domain. A novel approach for measuring pressure, which offers high accuracy (${\lt}{{1}}\%$) and precision (0.42%), is presented. The technique is first demonstrated in a chamber for a range of pressures (1–1.5 bar). This technique shows an impressive capability of resolving 1D pressure gradients arising from a ${{\rm{N}}_2}$ jet impinging on a surface, both in laminar and turbulent conditions. The technique is shown to be capable of resolving single-shot pressure gradients (0.04 bar/mm) originating from kinetic energy conversion to pressure and resolves characteristic ${{\rm{O}}_2}/{{\rm{N}}_2}$ structures from laminar and turbulent mixing.

© 2020 Optical Society of America

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