ABSTRACT
The concentration of ozone at ground level has been used as an indicator of the extent of pollution in the air. Ozone is a powerful oxidizing agent and a very strong disinfectant. In industry, it is generated from air or oxygen by means of electrically powered devices called ozone generators. A number of methods have been used for the analysis and monitoring of ozone concentration in gas streams. The thin-film semiconductor-type monitor is a small portable device, well suited for ozone leak detection. The ultraviolet (UV) method of measurement is an absolute method for the detection of ozone in the gas phase. The difference between the intensity of its UV signals when the sample is flowing and when the ozone-free reference sample is used is the basis for computing the ozone concentration in the sample, based on the Beer-Lambert law. The resistance of the semiconductor varies substantially in the presence of ozone due to the adsorption and decomposition of ozone.
