SENSITIVITY ENHANCEMENT FOR A REFLECTIVE OZONE MONITOR

Abstract

In the design of ozone sensor, sensitivity is one of the performance criteria that is considered [1 -3]. Sensor sensitivity is the minimum input that will generate a readable output change[4]. For sensors based on absorption spectroscopy, sensitivity is directly proportional to optical path length [3, 5-8]. In the conventional design of a transmission type optical sensor, the beam of light is radiated parallel to the gas cell; hence a transmission type gas cell will have optical path length approximately equal to the length of the gas cell[3]. For our design, the basic laws of reflection are explored that is the angle of reflection equals the angle of incidence[9] in combination with factors that favours the reduction of head loss in fluid flow (the sudden enlargement transition is considered)[10]