Optical Filters used in SO₂ Detection

Optical filters for sulfur dioxide (SO₂) detection are designed to transmit specific ultraviolet (UV) or mid-infrared (MIR) absorption bands while reducing unwanted out-of-band light and background noise. By isolating the characteristic absorption wavelengths of SO₂—such as those near 285nm in the UV or 7.3µm in the MIR spectral regions—these filters enable optical gas sensors to accurately measure gas concentrations in complex atmospheric and industrial environments.

Applications:

  • Continuous Emission Monitoring Systems (CEMS) for analyzing industrial exhaust and power plant stack gases
  • Environmental air quality stations for measuring ambient atmospheric SO₂ pollution levels
  • Differential Optical Absorption Spectroscopy (DOAS) for remote sensing of volcanic emissions and industrial plumes
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Filters

2 items

Filter

  • LP360 Longpass Filter (T>90%@370-1200nm, OD3@200-350nm)

    OD3

    $45.00

  • BP214-10 Bandpass Filter(CWL=214nm,FWHM=10nm)

    OD4@200-1200nm

    $70.00

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