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Optical Diagnostics

An important element of the OSU program in nonequilibrium thermodynamics is the extensive integration of advanced laser-based optical diagnostics, which provides our students with a unique set of experimental tools. As an example, we have recently developed a MHz repetition rate flow imaging system, which allows capturing planar images of turbulent and unsteady supersonic flow phenomena in real time.

Other diagnostic systems available for student research include: Molecular Tagging Velocimetry (MTV) for microscale flows; spectrally filtered Raman/Thomson scattering; Two-Photon Absorption Laser Induced Fluorescence (TALIF); Coherent Anti-Stokes Raman Scattering (CARS) and four-wave mixing; step-scan Fourier Transform Infrared (FTIR) spectroscopy; spontaneous Raman spectroscopy; UV, visible, and IR emission spectroscopy; and schlieren imaging.

Major laser / optical systems include: multiple pulsed Nd:YAG lasers (including two ps lasers); MHz rate burst mode laser, multiple tunable dye lasers, two Optical Parametric Oscillators (OPO); pulsed Titanium:Sapphire Laser, single frequency external cavity diode laser, tunable excimer laser, multiple Fourier transform infrared spectrometers, multiple Optical Multichannel Analyzer (OMA) systems, scientific and intensified CCD cameras.

These presentations give an overview of our recent advances in this field: