Scientific Results

Quartz-Enhanced Photoacoustic sensors for H2S trace gas detection

Year: 2015

Authors: Spagnolo V., Patimisco P., Sampaolo A., Pennetta R., Siciliani de Cumis M., Viciani S., Borri S., De Natale P., D’Amato F., Vitiello M.S., Scamarcio G.

Autors Affiliation: Univ Bari, Dipartimento Interateneo Fis, Bari, Italy;
Politecn Bari, CNR IFN UOS BARI, Bari, Italy;
CNR, Ist Nazl Ott, I-50125 Florence, Italy;
European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, FI, Italy;
CNR, Ist Nanosci, NEST, I-56127 Pisa, Italy;
Scuola Normale Super Pisa, I-56127 Pisa, Italy

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 mu m, while in the mid-IR we employed a quantum cascade laser (QCL) operating at 7.9 mu m, fiber-coupled to the QEPAS cell. In the THz range we employed a QCL emitting at 2.91 THz. H2S absorption features with line-strength up to similar to 10(-21) cm/mol were selected and QEPAS normalized noise-equivalent absorption in the 10(-9) W center dot cm(-1)center dot Hz(-1/2) range was achieved..

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KeyWords: Chemical sensors; Gas detectors; Nanophotonics; Quantum cascade lasers; Quartz; Semiconductor lasers, Absorption features; Different sizes; Normalized noise; Photoacoustic sensors; Quartz tuning fork; Quartz-enhanced photoacoustic spectroscopies; Spectral range; Trace gas detection, Photoacoustic spectroscopy

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