Sub-ppb detection of benzene using cantilever-enhanced photoacoustic spectroscopy with a long-wavelength infrared quantum cascade laser
Juho Karhu, Hadrien Philip, А. Н. Баранов, R. Teissier, Tuomas Hieta
Abstract
We report a novel, to the best of our knowledge, photoacoustic spectrometer for trace gas sensing of benzene. A quantum cascade laser emitting at the wavelength 14.8 µm is used as the light source in the spectroscopic detection. This wavelength region contains the strongest vibrational band of benzene, which is free of spectral overlap from common trace gases, making it a strong candidate for sensitive benzene detection. Cantilever-enhanced photoacoustic spectroscopy is used for detection. This simple and robust measurement setup can reach a benzene detection limit below 1 ppb.
Topics & Concepts
Quantum cascade laserPhotoacoustic spectroscopyMaterials scienceOpticsSpectroscopyWavelengthBenzeneDetection limitLaserSpectrometerInfraredTrace gasCantileverAnalytical Chemistry (journal)OptoelectronicsPhysicsChemistryMeteorologyChromatographyComposite materialOrganic chemistryQuantum mechanicsSpectroscopy and Laser ApplicationsAdvanced Chemical Sensor TechnologiesAtmospheric Ozone and Climate