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Quantum Cascade Laser-Based Photoacoustic Sensor for Trace Detection of Formaldehyde Gas

By Angela Elia, Cinzia Di Franco, Vincenzo Spagnolo, Pietro Mario Lugarà and Gaetano Scamarcio

Abstract

We report on the development of a photoacoustic sensor for the detection of formaldehyde (CH2O) using a thermoelectrically cooled distributed-feedback quantum cascade laser operating in pulsed mode at 5.6 μm. A resonant photoacoustic cell, equipped with four electret microphones, is excited in its first longitudinal mode at 1,380 Hz. The absorption line at 1,778.9 cm−1 is selected for CH2O detection. A detection limit of 150 parts per billion in volume in nitrogen is achieved using a 10 seconds time constant and 4 mW laser power. Measurements in ambient air will require water vapour filters

Topics: Article
Publisher: Molecular Diversity Preservation International (MDPI)
OAI identifier: oai:pubmedcentral.nih.gov:3348822
Provided by: PubMed Central
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    1. (1981). A long path infrared study of Los Angeles smog.
    2. Absolute line intensities measurements and calculations for the 5.7 and 3.6 m bands of formaldehyde.
    3. (2009). Available online: http:/ www.epa.gov/osw/hazard/testmethods/sw846, accessed
    4. (2009). Available online: http://www.epa.gov/lawsregs/, accessed
    5. (2009). Available online: http://www.hitran.com, accessed
    6. (2002). Chemical sensors based on quantum cascade lasers.
    7. (1998). Detection of biomass burning combustion products in Southeast Asia from backscatter data taken by the GOME spectrometer.
    8. (1991). Determination of volatile carbonyl compounds in clean air.
    9. (2009). Emissions of formaldehyde, acetic acid, methanol, and other trace gases from biomass fires in North Carolina measured by airborne Fourier transform infrared spectroscopy.
    10. (1984). Importance of formaldehyde in cloud chemistry.
    11. (2003). New analysis of the v2, v3, v4, and v6 bands of formaldehyde
    12. (2005). Photoacoustic detection of nitric oxide by use of a quantum cascade laser.
    13. (2006). Photoacoustic detection of NO2 and N2O using quantum cascade lasers.
    14. (2002). Rapid formaldehyde monitoring in ambient air by means of mid-infrared cavity leak-out spectroscopy.
    15. (2008). Room temperature continuous wave operation of quantum cascade lasers with watt-level optical power.
    16. (2000). Satellite observations of formaldehyde over
    17. (2004). using a pulsed quantum cascade laser spectrometer.

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