Paul S. Hsu

TL;DR: In this paper, high-speed 4D, volumetric laser-induced fluorescence measurements using an ultraviolet-tunable narrowband laser source to reach electronic transitions of chemical species of interest, such as the hydroxyl radical (OH), were presented.

TL;DR: Single-shot, two-color, volumetric laser-induced fluorescence was demonstrated for three-dimensional (3D), tomographic imaging of the structural properties of the OH radical and temperature field in a turbulent hydrogen-air flame and key strategies for minimizing sources of error, such as detector sensitivity and spatial overlap of the two fields are discussed.

TL;DR: In this article, the authors measured the coherence lifetimes of H2 Q-branch Raman coherence using time-resolved picosecond coherent anti-Stokes Raman scattering (ps-CARS) using a custom-built, high-peak power, nearly transform-limited ps laser system.

TL;DR: The performance of the 100 ps burst-mode laser is evaluated and been found to compare favorably with that of a similar design that employs a conventional ∼8 ns pulse duration, and the 100 picosecond pulse duration is optimal for fiber-coupled spectroscopic measurements in harsh reacting-flow environments.

TL;DR: Temperature measurements based on gas-phase coherent anti-Stokes Raman scattering (CARS) spectroscopy-based temperature measurements at 100 kHz will significantly aid the understanding of transient and unsteady flow phenomena related to turbulent combustion, transonic and hypersonic flows, high-enthalpy flows, and the dynamics of energetic materials.