Gas densities of various gaseous species are measured up to 16.5 barg via spontaneous Rayleigh-Brillouin scattering (SRBS) induced by a focused 532-nm laser pulse. Laser pulse energy is monitored and controlled according to the gas density for enhancement of the signal-to-noise ratio (SNR) of the SRBS signal, while limited by the threshold of the laser-induced breakdown. SRBS signal is spectrally dispersed by a virtually imaged phased array (VIPA) and formed into a fringe pattern. The SRBS is reconstructed in the frequency domain from each fringe pattern and ensemble-averaged for gas density measurement.
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