Optical sulfur dioxide sensor based on broadband absorption spectroscopy in the wavelength range of 198–222 nm

A highly sensitive sulfur dioxide detection system based on broadband absorption spectroscopy was developed using the 198–222 nm wavelength range. The compact and simple measurement system was constructed utilizing fiber optoelectronic sensing device. A modified approach based on differential optical absorption spectroscopy was used for the computation of sulfur dioxide concentrations. The results of sulfur dioxide concentration were calibrated and displayed using a LabVIEW-based software. A system detection limit of 17 ppb per meter has been reached, and a ten-fold improvement in sensitive and uncertainty has been achieved for measuring sulfur dioxide concentrations. The system is suitable for monitoring sulfur dioxide concentration in air as well as for the fault diagnosis of gas insulated switchgears.