Overtone resonance enhanced single-tube on-beam quartz enhanced photoacoustic spectrophone

被引：50

作者：

Zheng, Huadan ^{[1
,2
]}

Dong, Lei ^{[1
,2
]}

Sampaolo, Angelo ^{[3
,4
,5
]}

Patimisco, Pietro ^{[3
,4
,5
]}

Ma, Weiguang ^{[1
,2
]}

Zhang, Lei ^{[1
,2
]}

Yin, Wangbao ^{[1
,2
]}

Xiao, Liantuan ^{[1
,2
]}

Spagnolo, Vincenzo ^{[3
,4
]}

Jia, Suotang ^{[1
,2
]}

Tittel, Frank K. ^{[5
]}

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, Dipartimento Interateneo Fis, Via Amendola 173, I-70126 Bari, Italy

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

[5] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

来源：

APPLIED PHYSICS LETTERS | 2016年 / 109卷 / 11期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

QUANTUM CASCADE LASER; MODULATION CANCELLATION METHOD; PPB-LEVEL DETECTION; QEPAS SENSOR; MU-M; SPECTROSCOPY; SYSTEM; OXIDE;

D O I：

10.1063/1.4962810

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A single-tube on-beam quartz enhanced photoacoustic spectroscopy (SO-QEPAS) spectrophone, which employs a custom-made quartz tuning fork (QTF) having a prong spacing of 700 mu m and operating at the 1st overtone flexural mode, is reported. The design of QTF prong geometry allows the bare QTF to possess twice higher Q-factor values for the 1st overtone resonance mode falling at similar to 17.7 kHz than in the fundamental resonance mode at similar to 2.8 kHz, resulting in an 8 times higher QEPAS signal amplitude when operating in the 1st overtone resonance mode. Both the vertical position and length of the single-tube acoustic micro-resonator (AmR) were optimized to attain optimal spectrophone performance. Benefiting from the high overtone resonance frequency and the quasi 1st harmonic acoustic standing waves generated in the SO-QEPAS configuration, the AmR length is reduced to 14.5 mm. This allows the realization of compact spectrophone and facilitates the laser beam alignment through the QTF + AmR system. The signal enhancement in the overtone resonance mode and the high acoustic coupling efficiency between the AmR and QTF in the SO-QEPAS configuration yields an overall sensitivity enhancement factor of similar to 380 with respect to the bare custom QTF operating in the fundamental resonance mode. Published by AIP Publishing.

引用

页数：5

共 32 条

[1] Quartz-enhanced photoacoustic spectroscopy sensor for ethylene detection with a 3.32 μm distributed feedback laser diode [J].