On the basis of SO2 absorption spectroscopy

the monitoring technique for SO2 concentration around 300 nm using an ultraviolet light-emitting diode( LED) as the light source was developed. The theoretical relationship model between the SO2 concentrations and the optical parameters was established. The experimental results show that

using the novel data processing method to evaluate the SO2 concentration can reduce the influence of the detector electron noise and the light source on measurement significantly. The detection limit can reach 0. 2 μL / L when the signal noise ratio equals 2. Long-term detection of SO2 concentration was carried out to verify the stability and accuracy of this measurement technique. To sum up

using an ultraviolet light-emitting diode can reduce the cost and prolong the service life of sulfur dioxide monitoring.