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We employ dual-probe 1-d fs/ps hybrid rotational coherent anti-Stokes Ramanspectroscopy to investigate simultaneous temperature, pressure, and O2/N2measurements for gas-phase diagnostics. The dual-probe HRCARS technique allowsfor simultaneous measurements from the time and frequency-domain. A novelapproach for measuring pressure, which offers high accuracy (<1%) and precision(0.42%) is presented. The technique is first demonstrated in a chamber for arange of pressures (1-1.5 bar). This technique shows an impressive capabilityof resolving 1-d pressure gradients arising from a N2 jet impinging on asurface, both in laminar and turbulent conditions. The technique is shown to becapable of resolving single-shot pressure gradients (0.04 bar/mm) originatingfrom kinetic energy conversion to pressure, and resolves characteristic O2/N2structures from laminar and turbulent mixing.

Dual-probe 1-d hybrid fs/ps rotational CARS for simultaneous single-shot temperature, pressure, and O2/N2 measurements