Cavity and quartz enhanced photo-acoustic mid-IR sensor

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Abstract

We report on a novel intracavity quartz enhanced photoacoustic (I-QEPAS) gas sensing technique taking advantage from both the high Q-factor of standard tuning forks and the power build-up of a high-finesse optical resonator. This first prototype employs a distributed feedback quantum cascade laser operating at 4.3 μm. CO2 has been selected as gas target. Preliminary results demonstrate an improved sensitivity, close to the cavity enhancement factor (500) times the optical coupling efficiency (about 0.5), with respect to standard QEPAS technique. The detection limit was pulled from 7 ppm (obtained with standard QEPAS) down to 32 ppb, corresponding to normalized noise-equivalent absorption in the 10-9 W•cm-1•Hz-1/2 range.

Autore Pugliese

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  • Patimisco P. , Borri S. , Scamarcio G. , Spagnolo V. , Galli I , Giusfedi G. , Mazzotti D , De Natale P. (2014). Cavity and quartz enhanced photo-acoustic mid-IR sensor.

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PROCEEDINGS OF SPIE

Anno di pubblicazione

2014

ISSN

1996-756X

ISBN

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0

Ultimo Aggiornamento Citazioni

2017-04-22 03:20:59

Settori ERC

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Codici ASJC

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