Quartz-enhanced photoacoustic spectroscopy exploiting low-frequency tuning forks as a tool to measure the vibrational relaxation rate in gas species

被引：68

作者：

Dello Russo, Stefano ^{[1
,2
,3
,4
]}

Sampaolo, Angelo ^{[3
,4
]}

Patimisco, Pietro ^{[3
,4
]}

Menduni, Giansergio ^{[3
,4
,5
]}

Giglio, Marilena ^{[3
,4
]}

Hoelzl, Christine ^{[6
]}

Passaro, Vittorio M. N. ^{[5
]}

Wu, Hongpeng ^{[1
,2
]}

Dong, Lei ^{[1
,2
]}

Spagnolo, Vincenzo ^{[1
,2
,3
,4
]}

机构：

[1] Shanxi Univ, Inst Laser Spect, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Peoples R China

[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China

[3] Univ Bari, PolySense Lab, CNR IFN, Dipartimento Interateneo Fis, Via Amendola 173, I-70126 Bari, Italy

[4] Politecn Bari, CNR IFN, Via Amendola 173, I-70126 Bari, Italy

[5] Politecn Bari, Dipartimento Ingn Elettr & Informaz, Photon Res Grp, Via Orabona 4, I-70126 Bari, Italy

[6] Thorlabs GmbH, Munchner Weg 1, D-85232 Bergkirchen, Germany

来源：

PHOTOACOUSTICS | 2021年 / 21卷

基金：

欧盟地平线“2020”; 中国国家自然科学基金;

关键词：

Quartz enhanced photoacoustic spectroscopy; Quartz tuning forks; Gas relaxation rate; Methane; Water vapour; METHANE; SENSOR; QEPAS; CO;

D O I：

10.1016/j.pacs.2020.100227

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

We demonstrated that quartz-enhanced photoacoustic spectroscopy (QEPAS) is an efficient tool to measure the vibrational relaxation rate of gas species, employing quartz tuning forks (QTFs) as sound detectors. Based on the dependence of the QTF resonance frequency on the resonator geometry, a wide range of acoustic frequencies with narrow detection bandwidth was probed. By measuring the QEPAS signal of the target analyte as well as the resonance properties of different QTFs as a function of the gas pressure, the relaxation time can be retrieved. This approach has been tested in the near infrared range by measuring the CH4 (n nu 4) vibrational relaxation rate in a mixture of 1% CH4, 0.15 % H2O in N2, and the H2O (nu 1) relaxation rate in a mixture of 0.5 % H2O in N2. Relaxation times of 3.2 ms Torr and 0.25 ms Torr were estimated for CH4 and H2O, respectively, in excellent agreement with values reported in literature.

引用

页数：8

共 33 条

[1] Water-based enhancement of the resonant photoacoustic signal from methane-air samples excited at 3.3 μm [J].