Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy
AbstractWe 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/Hz½, was achieved, representing a nearly one-order-of-magnitude improvement with respect to previous reports. View Full-Text
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Sampaolo, A.; Patimisco, P.; Giglio, M.; Vitiello, M.S.; Beere, H.E.; Ritchie, D.A.; Scamarcio, G.; Tittel, F.K.; Spagnolo, V. Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy. Sensors 2016, 16, 439.
Sampaolo A, Patimisco P, Giglio M, Vitiello MS, Beere HE, Ritchie DA, Scamarcio G, Tittel FK, Spagnolo V. Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy. Sensors. 2016; 16(4):439.Chicago/Turabian Style
Sampaolo, Angelo; Patimisco, Pietro; Giglio, Marilena; Vitiello, Miriam S.; Beere, Harvey E.; Ritchie, David A.; Scamarcio, Gaetano; Tittel, Frank K.; Spagnolo, Vincenzo. 2016. "Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy." Sensors 16, no. 4: 439.
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