Improved Tuning Fork for Terahertz Quartz-Enhanced Photoacoustic Spectroscopy

被引：52

作者：

Sampaolo, Angelo ^{[1
,2
,3
]}

Patimisco, Pietro ^{[1
,2
,3
]}

Giglio, Marilena ^{[1
,2
]}

Vitiello, Miriam S. ^{[4
,5
]}

Beere, Harvey E. ^{[6
]}

Ritchie, David A. ^{[6
]}

Scamarcio, Gaetano ^{[1
,2
]}

Tittel, Frank K. ^{[3
]}

Spagnolo, Vincenzo ^{[1
,2
]}

机构：

[1] Univ Bari Aldo Moro, Dipartimento Interateneo Fis, Via Amendola 173, I-70126 Bari, Italy

[2] Politecn Bari, Via Amendola 173, I-70126 Bari, Italy

[3] Rice Univ, Dept Elect & Comp Engn, 6100 Main St, Houston, TX 77005 USA

[4] CNR Ist Nanosci, NEST, Piazza San Silvestro 12, I-56127 Pisa, Italy

[5] Scuola Normale Super Pisa, Piazza San Silvestro 12, I-56127 Pisa, Italy

[6] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

来源：

SENSORS | 2016年 / 16卷 / 04期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

quartz enhanced photoacoustic spectroscopy; quartz tuning fork; gas sensing; THz spectroscopy; quantum cascade laser; COHERENT TRANSIENTS; SENSOR;

D O I：

10.3390/s16040439

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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 x 10(-11) cm(-1) W/Hz(1/2), was achieved, representing a nearly one-order-of-magnitude improvement with respect to previous reports.

引用

页数：8

共 24 条

[1] Terahertz quartz enhanced photo-acoustic sensor [J].