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.
|Titolo:||Quartz Enhanced Photoacoustic Sensors for Trace Gas Detection in the IR and THz Spectral Range|
|Titolo del libro:||THz and Security Applications : Detectors, Sources and Associated Electronics for THz Applications|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1007/978-94-017-8828-1_8|
|Appare nelle tipologie:||2.1 Contributo in volume (Capitolo o Saggio)|