MULTISPECIES RAMAN IMAGING IN FLAMES BY USE OF AN UNINTENSIFIED CHARGE-COUPLED-DEVICE

The application of an unintensified charge-coupled device (CCD) to one -dimensional multispecies Raman flame imaging is demonstrated. Relativ e signal strength is improved by the higher quantum efficiency of the unintensified CCD versus an intensified CCD generally used for Raman i maging. Experimental comparisons of unintensified and intensified CCD systems show similar to 40% improvement in the signal-to-noise ratios of major-species Raman signals for laboratory-scale H-2-air names. The maximum possible signal improvement is limited by the 40% transmissio n efficiency of the ferroelectric liquid-crystal light valve used to g ate the CCD, although the light valve is demonstrated to be unnecessar y for low-luminosity flames.