A Photomultiplier Tube (PMT) based optical fiber Raman sensor was developed for online
monitoring of nitrogen/oxygen concentration ratios in gaseous mixtures. The sensor employed a frequency
doubled 532 nm continuous wave (CW) Nd:YAG laser and a modified In-Photonics fiber optic state-of-art
miniaturized Raman Probe. The gaseous mixture was enclosed in a high pressure cell and subjected to
varying degrees of pressure. Raman signal of gaseous nitrogen and oxygen were first analyzed with a
miniature spectrometer. The detection system was then replacing by a Labview interfaced PMT module for
fast data acquisition and real time monitoring of relative Raman signals of nitrogen and oxygen.
Instrumentation features and sensor performances with different detection systems (i.e. spectrometer and
PMT) is presented in the paper.
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