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.

Date Published: 11 May 2009
PDF: 5 pages
Proc. SPIE 7336, Signal Processing, Sensor Fusion, and Target Recognition XVIII, 73361O (11 May 2009); doi: 10.1117/12.820306

Published in SPIE Proceedings Vol. 7336:
Signal Processing, Sensor Fusion, and Target Recognition XVIII
Ivan Kadar, Editor(s)