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8 February 2015 Quartz-enhanced photoacoustic sensors for H2S trace gas detection
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Abstract
We report on three different quartz enhanced photoacoustic (QEPAS) sensors operating in the near-IR, mid-IR and THz spectral ranges, employing quartz tuning forks of different sizes and shapes. To test our sensors in the near-IR we used a diode laser working at 2.7 μm, while in the mid-IR we employed a quantum cascade laser (QCL) operating at 7.9 μm, fiber-coupled to the QEPAS cell. In the THz range we employed a QCL emitting at 2.95 THz. H2S absorption features with line-strength up to 10-20 cm/mol were selected and QEPAS normalized noise-equivalent absorption in the 10-10 W•cm-1•Hz-1/2 range was achieved..
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Vincenzo Spagnolo, Pietro Patimisco, Angelo Sampaolo, Riccardo Pennetta, Mario Siciliani de Cumis, Silvia Viciani, Simone Borri, Paolo De Natale, Francesco D'Amato, Miriam S. Vitiello, and Gaetano Scamarcio "Quartz-enhanced photoacoustic sensors for H2S trace gas detection", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93700Y (8 February 2015); https://doi.org/10.1117/12.2078929
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