We report on an innovative quartz enhanced photoacoustic (QEPAS) gas sensor operating in the THz spectral range, employing a custom quartz tuning fork (QTF) with the two prongs spaced by ~800 μm. To test our sensor we employed a quantum cascade laser light source and selected a methanol rotational absorption line falling at 131.054 cm-1 (~3.93 THz), with line-strength S = 4.28•10-21 cm. The sensor operated at 10 Torr pressure on the QTF first flexion resonance frequency at 4245 Hz. We achieved a QEPAS normalized noise-equivalent absorption of 2•10-10 W·cm-1•Hz-1/2 comparable with the best result of mid-IR QEPAS systems.
THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source / Spagnolo, V.; Patimisco, P.; Borri, S.; Sampaolo, A.; Scamarcio, G.; Vitiello, M. S.; Beere, H. E.; Ritchie, D. A.. - STAMPA. - 8893:(2014). (Intervento presentato al convegno Conference on Quantum Sensing and Nanophotonic Devices XI tenutosi a San Francisco, CA nel February 2-6, 2014) [10.1117/12.2033620].
THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source
Spagnolo V.;Patimisco P.;Sampaolo A.;
2014
Abstract
We report on an innovative quartz enhanced photoacoustic (QEPAS) gas sensor operating in the THz spectral range, employing a custom quartz tuning fork (QTF) with the two prongs spaced by ~800 μm. To test our sensor we employed a quantum cascade laser light source and selected a methanol rotational absorption line falling at 131.054 cm-1 (~3.93 THz), with line-strength S = 4.28•10-21 cm. The sensor operated at 10 Torr pressure on the QTF first flexion resonance frequency at 4245 Hz. We achieved a QEPAS normalized noise-equivalent absorption of 2•10-10 W·cm-1•Hz-1/2 comparable with the best result of mid-IR QEPAS systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
