Quartz-enhanced photo-acoustic spectroscopy (QEPAS) is one of the most robust and sensitive trace-gas detection techniques, which in the mid-IR range offers the advantage of high sensitivity, compactness and fast time-response. One of the main features of the photoacoustic techniques is that no optical detection is re-quired. Thus, the use of the QEPAS technique in THz range would allow to avoid the use of low-noise but expensive, bulky and cryogenic bolometers. The results obtained in the development of QEPAS sensors for trace gas detection of several chemical species, employing mid-IR and THz laser sources will be reviewed. Nor-malized noise equivalent absorption coefficients (NNEA) down to 10-10 cm-1W/Hz½ and part per trillion concentration detection ranges have been attained.
Quartz Enhanced Photoacoustic Sensors for Trace Gas Detection in the IR and THz Spectral Range / Patimisco, Pietro; Borri, Simone; Sampaolo, Angelo; Vitiello, Miriam S.; Scamarcio, Gaetano; Spagnolo, Vincenzo (NATO SCIENCE FOR PEACE AND SECURITY SERIES. B, PHYSICS AND BIOPHYSICS). - In: THz and Security Applications : Detectors, Sources and Associated Electronics for THz Applications / [a cura di] Carlo Corsi, Fedir Sizov. - STAMPA. - Dordrecht : Springer, 2014. - ISBN 978-94-017-8827-4. - pp. 139-151 [10.1007/978-94-017-8828-1_8]
Quartz Enhanced Photoacoustic Sensors for Trace Gas Detection in the IR and THz Spectral Range
Pietro Patimisco;Angelo Sampaolo;Vincenzo Spagnolo
2014-01-01
Abstract
Quartz-enhanced photo-acoustic spectroscopy (QEPAS) is one of the most robust and sensitive trace-gas detection techniques, which in the mid-IR range offers the advantage of high sensitivity, compactness and fast time-response. One of the main features of the photoacoustic techniques is that no optical detection is re-quired. Thus, the use of the QEPAS technique in THz range would allow to avoid the use of low-noise but expensive, bulky and cryogenic bolometers. The results obtained in the development of QEPAS sensors for trace gas detection of several chemical species, employing mid-IR and THz laser sources will be reviewed. Nor-malized noise equivalent absorption coefficients (NNEA) down to 10-10 cm-1W/Hz½ and part per trillion concentration detection ranges have been attained.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
