ANALYTICAL DETECTION SYSTEM OF MIXED ODOR VAPORS USING CHEMILUMINESCENCE-BASED GAS SENSOR

A chemiluminescence(CL)-based gas sensor made of gamma-Al2O3 emits CL during catalytic oxidation of a combustible odor vapor. The CL intensi ty is proportional to the concentration of ethanol or acetone vapor in air. The algebraic sum rule is applicable to the CL intensities by th e mixed gas of these two kinds of vapors, when the sensor is heated ab ove 450 degrees C, The CL intensities are measured in periodic tempera ture cycles between 650 and 450 degrees C. The concentrations of vapor components can be detected analytically by measuring total CL intensi ties during the high and low temperatures for air containing mixed vap ors of various concentrations of ethanol below 400 ppm and acetone bel ow 200 ppm.