Deep Ultraviolet Light Emitting Diode (LED)-Based Sensing of Sulfur Dioxide

With the recent development of deep ultraviolet (DUV) light emitting diodes (LEDs) comes the possibility of targeting absorption bands of several gases, including sulfur dioxide (SO₂). SO₂ has strong absorption bands in the 300 nm spectral region. The low cost and small size of DUV LEDs, coupled with their spectral coverage, makes them viable sources for new gas sensors. Here, we demonstrate the capability to use absorption spectroscopy with a balanced detection scheme using a 300 nm DUV LED source for SO₂ detection at concentrations ranging from less than 1 ppm to 50 ppm.