Air quality monitoring is a primary activity for industrial and social environment. The government push for pollutants that must he monitored. Especially, the VOCs (Volatile Organic Compounds). which arc very harmful for human and environment, should be controlled under the government policy. We have been developed a VOCs measurement system which recognize various kinds and quantities or VOCs, such as benzene, toluene, and xylene (BTX). Especially, we designed sensor array with various kinds or gas sensor and ANN (Artificial Neural Network) algorithm. The measured values for BTX have errors or 1~4 ppm.
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