Open AccessHigh-speed 2D Raman imaging at elevated pressures
Author(s) -
Naibo Jiang,
Paul S. Hsu,
Jason Mance,
Yue Wu,
Mark Gragston,
Zhili Zhang,
Joseph D. Miller,
James R. Gord,
Sukesh Roy
Publication year - 2017
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.42.003678
Subject(s) - materials science , optics , raman scattering , laser , pulse (music) , pulse duration , raman spectroscopy , dissipation , physics , detector , thermodynamics
Two-dimensional (2D) Raman scattering at 10 kHz in non-reacting flow mixtures is demonstrated by employing a burst-mode laser with a long-duration pulse of about 70 ns and pulse energy of about 750 mJ at 532 nm. To avoid optical breakdown, the pulse width of the laser was varied in the range of 10-1000 ns. The effects of pulse shape, pulse energy, and harmonic conversion on 2D measurements are also studied. The applications of high-speed, single-shot, 2D imaging of CH 4 and H 2 jets in N 2 at elevated pressures are demonstrated. In addition, the scalar dissipation rate of CH 4 in N 2 at 20 bar is determined, and multi-dimensional, multi-species, high-speed imaging of flows at elevated pressures is demonstrated.