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Portable Formaldehyde Sensor with Sub-ppb Sensitivity

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Project Quick Facts

Principal Investigator

  • Prof. REN Wei

    Department of Mechanical and Automation Engineering

  • Funding

    Innovation and Technology Commission

This project developed a battery-driven handheld optical sensor for calibration-free and ultra-sensitive formaldehyde detection. The proposed formaldehyde sensor adopts the recently developed optical method using multipass-assisted wavelength modulation spectroscopy with low cost and low power consumption. The sensor achieves a minimum detection limit of 0.6 ppb at 1 s measurement time and the detection is free of interference from other gases in the ambient environment.

Formaldehyde sensor prototype
Design of a multipass gas cell

Uniqueness and Competitive Advantages:

  • Infrared laser absorption sensor
  • Ultra-sensitivity (sub-ppb) of formaldehyde
  • Ultra-fast (1 second) detection
  • Low power consumption (battery driven)
  • Portable sensor
  •  
Sensor performance

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