Development of high-spectral-resolution planar laser-induced fluorescence imaging diagnostics for high-speed gas flows

Injection-seeded pulsed optical parametric systems, which produce tunable laser radiation much narrower than commercially available dye lasers, are useful for measurement of pressure, temperature, and velocity in high-speed gas flow. Supersonic and hypersonic flows involve strong coupling between kinematic and thermochemical states. The solid-state OP system can be pumped at much higher repetition rates than dye lasers, in which bleaching of the gain medium limits the repetition rate of the pump source. The optical parametric generator (OPG) system, which includes two counter-rotating barium-borate crystals, is pumped using the third harmonic output of an injection-seeded Nd:YAG laser. The OP system and LIF techniques can also be used with pulse-burst laser and high-frame-rate camera technology to perform immediate measurements of temperature, pressure, and velocity in high-speed flows.

Development of high-spectral-resolution planar laser-induced fluorescence imaging diagnostics for high-speed gas flows Academic Article