用于太赫兹石英增强光声光谱的改进型音叉
Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy.
作者信息
Sampaolo Angelo, Patimisco Pietro, Giglio Marilena, Vitiello Miriam S, Beere Harvey E, Ritchie David A, Scamarcio Gaetano, Tittel Frank K, Spagnolo Vincenzo
机构信息
Dipartimento Interateneo di Fisica, Università degli studi di Bari Aldo Moro e Politecnico di Bari, Via Amendola 173, Bari I-70126, Italy.
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
出版信息
Sensors (Basel). 2016 Mar 25;16(4):439. doi: 10.3390/s16040439.
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(-1)W/Hz(½), was achieved, representing a nearly one-order-of-magnitude improvement with respect to previous reports.
我们报道了一种用于甲醇（CH₃OH）检测的石英增强光声（QEPAS）传感器，该传感器采用了一种新型石英音叉（QTF），其经过专门设计，以增强太赫兹（THz）光谱范围内的QEPAS传感性能。本文讨论了QTF的特性，包括共振频率、品质因数和声电转换效率与音叉尺寸及音叉间距之间的函数关系。该QTF应用于一个QEPAS传感器系统中，该系统使用3.93 THz量子级联激光器作为激发源，与位于131.054 cm⁻¹处的甲醇旋转吸收线发生共振。在30 s积分时间内实现了160 ppb的最低检测限，对应归一化噪声等效吸收NNEA = 3.75×10⁻¹¹ cm⁻¹W/Hz½，与之前的报道相比有近一个数量级的提升。
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