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One‐dimensional imaging of H 2 densities and of temperatures via rotational Raman scattering of narrow‐band, 248 nm, laser light
Author(s) -
Gu Yongwei,
Rothe Erhard W.,
Reck Gene P.
Publication year - 1997
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199708)28:8<605::aid-jrs137>3.0.co;2-r
Subject(s) - raman spectroscopy , coherent anti stokes raman spectroscopy , laser , rayleigh scattering , raman scattering , spectrograph , optics , chemistry , excimer laser , raman cooling , x ray raman scattering , polarization (electrochemistry) , spectral line , atomic physics , molecular physics , physics , astronomy
It is demonstrated that the well known rotational Raman spectrum of H 2 can be used to find the relative densities of hydrogen and the gas temperature as a function of position. A line‐shaped beam from a tunable excimer laser intersects H 2 –air flames. Scattered light is acquired with an imaging spectrograph. This produces both Stokes and anti‐Stokes spectra. By adjusting the laser beam’s polarization, the interfering Rayleigh intensity is sufficiently reduced without the use of a filter. The temperature measurements can be from below room temperature to about 1200 K. The method also works at temperatures >1200 K, but the use of vibrational Raman spectroscopy is probably better there. Also shown is an image that has simultaneously acquired, spatially resolved spectra from rotational Raman, vibrational Raman and laser‐induced fluorescence. Such combined information might be used to diagnose a gaeous system in some detail. © 1997 John Wiley & Sons, Ltd.