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Water temperature and concentration sensor (stage VI) We have previously used a hybrid scanned/fixed-wavelength sensor to measure the temperature and mole fraction of water vapor during stage VI of the PDE cycle . Initial sensor applications Ethylene mole fraction sensor (stage I) The ethylene mole fraction sensor has been applied simultaneously to the head and tail ends of the Stanford PDE, as shown schematically in Fig. Water temperature and mole fraction sensor (stage VI) The H2O sensor was applied to the tail end of the 13-cm diameter PDE at NPS , as shown schematically in Fig.
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