TY - GEN
T1 - Mid-infrared laser-based detection of benzene
AU - Shakfa, Mohammad Khaled
AU - Elkhazraji, Ali
AU - Marangoni, Marco
AU - Farooq, Aamir
N1 - KAUST Repository Item: Exported on 2021-07-27
Acknowledgements: This work was funded by the Office of Sponsored Research (OSR) at King Abdullah University of Science and Technology (KAUST).
PY - 2021/4/18
Y1 - 2021/4/18
N2 - Benzene (C6H6) is one of the major public health concerns. It is emitted from various natural and anthropogenic sources, like fires and volcanic emissions, petrol service stations, transportation, and the plastics industry. Here, we present our work on developing a new benzene sensor using a widely tunable difference-frequency-generation (DFG) laser emitting between 11.56 and 15 µm (667–865 cm–1). The DFG process was realized between an external-cavity quantum-cascade-laser and a CO2 gas laser in a nonlinear, orientation-patterned GaAs crystal. We obtained the absorption cross-sections of the Q-branch of the ν4 vibrational band of benzene by tuning the wavelength of the DFG laser between 14.79 and 14.93 μm (670–676 cm–1). Benzene sensing measurements were performed near 14.84 µm (673.97 cm–1) with a direct laser absorption spectroscopy scheme. The benzene concentration was varied between ppb and ppm levels. Even with a relatively short optical path-length of 23 cm, our sensor achieved a benzene detection limit of about 10 ppb.
AB - Benzene (C6H6) is one of the major public health concerns. It is emitted from various natural and anthropogenic sources, like fires and volcanic emissions, petrol service stations, transportation, and the plastics industry. Here, we present our work on developing a new benzene sensor using a widely tunable difference-frequency-generation (DFG) laser emitting between 11.56 and 15 µm (667–865 cm–1). The DFG process was realized between an external-cavity quantum-cascade-laser and a CO2 gas laser in a nonlinear, orientation-patterned GaAs crystal. We obtained the absorption cross-sections of the Q-branch of the ν4 vibrational band of benzene by tuning the wavelength of the DFG laser between 14.79 and 14.93 μm (670–676 cm–1). Benzene sensing measurements were performed near 14.84 µm (673.97 cm–1) with a direct laser absorption spectroscopy scheme. The benzene concentration was varied between ppb and ppm levels. Even with a relatively short optical path-length of 23 cm, our sensor achieved a benzene detection limit of about 10 ppb.
UR - http://hdl.handle.net/10754/670277
UR - https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11772/2595041/Mid-infrared-laser-based-detection-of-benzene/10.1117/12.2595041.full
UR - http://www.scopus.com/inward/record.url?scp=85109214780&partnerID=8YFLogxK
U2 - 10.1117/12.2595041
DO - 10.1117/12.2595041
M3 - Conference contribution
SN - 9781510643789
BT - Optical Sensors 2021
PB - SPIE
ER -