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Area of Science:

  • Analytical Chemistry
  • Environmental Monitoring
  • Sensor Technology

Background:

  • Biogas production requires precise monitoring of methane and carbon dioxide.
  • Existing sensors may struggle with harsh environments and cross-sensitivity issues.
  • Cost-effective and robust sensor solutions are needed for biogas plant applications.

Purpose of the Study:

  • To develop and evaluate a new sensor for simultaneous methane and carbon dioxide measurement in biogas.
  • To utilize low-cost mid-infrared LEDs as light sources.
  • To ensure sensor suitability for harsh biogas plant environments.

Main Methods:

  • Implementation of quartz-enhanced photoacoustic spectroscopy (QEPAS) combined with an absorption path.
  • Integration of mid-infrared LEDs as light sources.
  • Testing of a standalone sensor system within an operational biogas plant for several weeks.

Main Results:

  • Achieved precision better than 1% for both methane and carbon dioxide sensors in the 40-60% concentration range.
  • Demonstrated significantly reduced cross-sensitivity to major biogas components compared to conventional absorption sensors.
  • Validated the sensor system's performance and suitability for long-term deployment in a biogas plant.

Conclusions:

  • The developed sensor offers a precise, cost-effective, and robust solution for biogas monitoring.
  • The QEPAS-based sensor with mid-infrared LEDs shows improved performance in harsh environments.
  • This technology has the potential to enhance biogas plant efficiency and safety.