4 February 2013 Part-per-trillion level detection of SF6 using a single-mode fiber-coupled quantum cascade laser and a quartz enhanced photoacoustic sensor
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Abstract
We will report here on the design and realization of optoacoustic sensors based on an external cavity QCL laser source emitting at 10,54 μm, fiber-coupled with a QEPAS spectrophone module. SF6 has been selected as the target gas. Single mode laser delivery through the prongs of the quartz tuning fork has been realized using a hollow waveguide fiber with internal core size of 300 μm. The achieved sensitivity of the system was 50 part per trillion in 1 s corresponding to a record for QEPAS normalized noise-equivalent absorption of 2,7•10-10 W•cm-1•Hz-1/2.
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V. Spagnolo, P. Patimisco, S. Borri, G. Scamarcio, Bruce E. Bernacki, Jason Kriesel, "Part-per-trillion level detection of SF6 using a single-mode fiber-coupled quantum cascade laser and a quartz enhanced photoacoustic sensor", Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 86310Z (4 February 2013); doi: 10.1117/12.2001638; https://doi.org/10.1117/12.2001638
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