Quantum cascade laser-based photoacoustic sulfuryl fluoride sensing
| Autor: | Marcelo Gomes da Silva, Sâmylla Cristina Espécie Bueno, Marcelo Silva Sthel, Helion Vargas, Kariza Mayra Silva Minini, András Miklós, Judit Angster |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Quantum optics
Physics 010504 meteorology & atmospheric sciences Physics and Astronomy (miscellaneous) business.industry General Engineering General Physics and Astronomy Radiation Laser 01 natural sciences law.invention 010309 optics Longitudinal mode chemistry.chemical_compound Optics chemistry law Excited state 0103 physical sciences Wavenumber Sulfuryl fluoride business Quantum cascade laser 0105 earth and related environmental sciences |
| Popis: | Although sulfuryl fluoride (SO2F2) is an efficient fumigant that does not react with the surface of indoor materials and does not reduce the stratospheric ozone shield, there are some concerns about its use. It is a toxic gas that attacks the central nervous system, and its global warming potential (GWP) value is 4780 for 100 years' time. Therefore, it is a clear necessity of implementing detection methods for tracing such a molecule. In this work a sensitive photoacoustic setup was built to detect SO2F2atconcentrations of parts per billion by volume (ppbv). The symmetric S-O stretching mode was excited by a continuous-wave quantum cascade laser with radiation wavenumber ranging from 1275.7 to 1269.3 cm−1. The photoacoustic signal was generated by modulating the laser wavenumber at the first longitudinal mode of the photoacoustic cell with amplitude depth of 5 × 10−3 cm−1. The detection of a minimumSO2F2concentration of 20 ppbv was achieved. |
| Databáze: | OpenAIRE |
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