Multispectral Air Pollution Sensor to Characterize of Total Suspended Particulates (TSP) Concentration

摘要

The atmosphere surrounding earth surface plays an important role in the daily life of human beings. Total suspended particulates (TSP) found in the atmosphere are made up of many compounds including soil, nitrate, sulphate, soot and organic carbon. In this study, an optical sensor has been designed and developed for measuring TSP concentrations in air. Our aim is to measure TSP concentrations in polluted air by using a newly developed optical sensor. The developed spectral sensor was based on the measured radiation transmitted through the air samples. Three pairs of visible LEDs and photodiodes are used as sensing emitters and detectors respectively. The transmitted radiation was measured in terms of the output voltage of the photodetector of the sensor system. A new multispectral algorithm has been developed to correlate TSP concentrations and the transmitted radiation. The newly developed system produced a high degree of accuracy with the correlation coefficient of 0.999 and the root-mean-square error of 5.535mg/l. The TSP concentration can be measured and monitored accurately using this sensor.