Quartz-Enhanced Photoacoustic Detection of Ethane in the Near-IR Exploiting a Highly Performant Spectrophone

Applied Sciences

FrankK. Tittel¹  Ezio Ranieri²  VittorioM. N. Passaro³  Marilena Giglio⁴  Fabrizio Sgobba⁴  Giansergio Menduni⁴  Stefano Dello Russo⁴  Angelo Sampaolo⁴  Vincenzo Spagnolo⁴  Pietro Patimisco⁴ 

[1] Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA;Dipartimento di Biologia Via Orabona 4, Università di Bari, I-70126 Bari, Italy;Photonics Research Group, Dipartimento di Ingegneria Elettrica e dell’informazione, Politecnico di Bari, Via Orabona 4, 70126 Bari, Italy;PolySense Lab—Dipartimento Interateneo di Fisica, Politecnico and University of Bari, CNR—IFN, Via Amendola 173, I-70126 Bari, Italy;

关键词: ethane;    quartz-enhanced photoacoustic spectroscopy;    laser diode;    near-infrared;   

DOI  :  10.3390/app10072447

来源: DOAJ

【 摘 要 】

In this paper the performances of two spectrophones for quartz-enhanced photoacoustic spectroscopy (QEPAS)-based ethane gas sensing were tested and compared. Each spectrophone contains a quartz tuning fork (QTF) acoustically coupled with a pair of micro-resonator tubes and having a fundamental mode resonance frequency of 32.7 kHz (standard QTF) and 12.4 kHz (custom QTF), respectively. The spectrophones were implemented into a QEPAS acoustic detection module (ADM) together with a preamplifier having a gain bandwidth optimized for the respective QTF resonance frequency. Each ADM was tested for ethane QEPAS sensing, employing a custom pigtailed laser diode emitting at ~1684 nm as the exciting light source. By flowing 1% ethane at atmospheric pressure, a signal-to-noise ratio of 453.2 was measured by implementing the 12.4 kHz QTF-based ADM, ~3.3 times greater than the value obtained using a standard QTF. The minimum ethane concentration detectable using a 100 ms lock-in integration time achieving the 12.4 kHz custom QTF was 22 ppm.

【 授权许可】

Unknown