A study of a correlation spectroscopy gas detection method

The study of an optical correlation spectroscopy gas detection system is presented in this thesis. The correlation spectroscopy method uses a sample of reference gas as a filter to identify the concentration of the target gas in a measurement gas cell. containing reference gas cell was also investigated by simulation and experiment. It was found by experiment and simulation, that by the pressurisation of the reference gas cell to 6 bar, the modulation index could by increased by up to a factor of 2. However, it was shown that the cross-sensitivity to a contaminant gas also increased.EThOS - Electronic Theses Online ServiceGBUnited Kingdo