Intracavity quartz-enhanced photoacoustic sensor

Abstract

We report on a spectroscopic technique named intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) employed for sensitive trace-gas detection in the mid-infrared spectral region. It is based on a combination of QEPAS with a buildup optical cavity. The sensor includes a distributed feedback quantum cascade laser emitting at 4.33 lm. We achieved a laser optical power buildup factor of 500, which corresponds to an intracavity laser power of 0.75 W. CO2 has been selected as the target molecule for the I-QEPAS demonstration. We achieved a detection sensitivity of 300 parts per trillion for 4 s integration time, corresponding to a noise equivalent absorption coefficient of 1.4108 cm1 and a normalized noise-equivalent absorption of 3.21010 W cm1 Hz1/2.


Autore Pugliese

Tutti gli autori

  • SCAMARCIO G.

Titolo volume/Rivista

Non Disponibile


Anno di pubblicazione

2014

ISSN

0003-6951

ISBN

Non Disponibile


Numero di citazioni Wos

43

Ultimo Aggiornamento Citazioni

Non Disponibile


Numero di citazioni Scopus

57

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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