http://www.cnr.it/ontology/cnr/individuo/prodotto/ID286986
A quartz enhanced photo-acoustic gas sensor based on a custom tuning fork and a terahertz quantum cascade laser (Articolo in rivista)
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- Label
- A quartz enhanced photo-acoustic gas sensor based on a custom tuning fork and a terahertz quantum cascade laser (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/c3an01219k (literal)
- Alternative label
Patimisco, Pietro; Borri, Simone; Sampaolo, Angelo; Beere, Harvey E.; Ritchie, David A.; Vitiello, Miriam S.; Scamarcio, Gaetano; Spagnolo, Vincenzo (2014)
A quartz enhanced photo-acoustic gas sensor based on a custom tuning fork and a terahertz quantum cascade laser
in Analyst (Lond., 1877, Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Patimisco, Pietro; Borri, Simone; Sampaolo, Angelo; Beere, Harvey E.; Ritchie, David A.; Vitiello, Miriam S.; Scamarcio, Gaetano; Spagnolo, Vincenzo (literal)
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- Dipartimento Interateneo di Fisica, Università e Politecnico di Bari, Via Amendola 173, I-70126 Bari, Italy; IFN-CNR UOS Bari, via Amendola 173, 70126 Bari, Italy; Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom; NEST, CNR, Istituto Nanoscienze and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy (literal)
- Titolo
- A quartz enhanced photo-acoustic gas sensor based on a custom tuning fork and a terahertz quantum cascade laser (literal)
- Abstract
- An innovative quartz enhanced photoacoustic (QEPAS) gas sensing system operating in the THz spectral range and employing a custom quartz tuning fork (QTF) is described. The QTF dimensions are 3.3 cm x 0.4 cm x 0.8 cm, with the two prongs spaced by similar to 800 mu m. To test our sensor we used a quantum cascade laser as the light source and selected a methanol rotational absorption line at 131.054 cm(-1) (similar to 3.93 THz), with line-strength S = 4.28 x 10(-21) cm mol(-1). The sensor was operated at 10 Torr pressure on the first flexion QTF resonance frequency of 4245 Hz. The corresponding Q-factor was 74 760. Stepwise concentration measurements were performed to verify the linearity of the QEPAS signal as a function of the methanol concentration. The achieved sensitivity of the system is 7 parts per million in 4 seconds, corresponding to a QEPAS normalized noise-equivalent absorption of 2 x 10(-10) W cm(-1) Hz(-1/2), comparable with the best result of mid-IR QEPAS systems. (literal)
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