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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.
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
