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- Title
Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy.
- Authors
Sampaolo, Angelo; Patimisco, Pietro; Giglio, Marilena; Vitiello, Miriam S.; Beere, Harvey E.; Ritchie, David A.; Scamarcio, Gaetano; Tittel, Frank K.; Spagnolo, Vincenzo
- Abstract
We report on a quartz-enhanced photoacoustic (QEPAS) sensor for methanol (CH3OH) detection employing a novel quartz tuning fork (QTF), specifically designed to enhance the QEPAS sensing performance in the terahertz (THz) spectral range. A discussion of the QTF properties in terms of resonance frequency, quality factor and acousto-electric transduction efficiency as a function of prong sizes and spacing between the QTF prongs is presented. The QTF was employed in a QEPAS sensor system using a 3.93 THz quantum cascade laser as the excitation source in resonance with a CH3OH rotational absorption line located at 131.054 cm-1. A minimum detection limit of 160 ppb in 30 s integration time, corresponding to a normalized noise equivalent absorption NNEA = 3.75 10-11 cm-1W/Hz, was achieved, representing a nearly one-order-of-magnitude improvement with respect to previous reports.
- Subjects
TUNING forks; PHOTOACOUSTIC spectroscopy; QUANTUM cascade lasers; GAS detectors; ELECTROACOUSTIC transducers; DETECTION limit
- Publication
Sensors (14248220), 2016, Vol 16, Issue 4, p439
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s16040439