Mid-infrared spectroscopy for gases and liquids based on quantum cascade technologies

被引：52

作者：

Jouy, Pierre ^{[1
]}

Mangold, Markus ^{[2
]}

Tuzson, Bela ^{[2
]}

Emmenegger, Lukas ^{[2
]}

Chang, Yu-Chi ^{[3
]}

Hvozdara, Lubos ^{[3
]}

Herzig, Hans Peter ^{[3
]}

Waegli, Philip ^{[4
]}

Homsy, Alexandra ^{[4
,5
]}

de Rooij, Nico F. ^{[4
]}

Wirthmueller, Alexander ^{[6
]}

Hofstetter, Daniel ^{[6
]}

Looserg, Herbert ^{[7
]}

Faist, Jerome ^{[1
]}

机构：

[1] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland

[2] Empa, Swiss Fed Labs Mat Sci & Technol, CH-8600 Dubendorf, Switzerland

[3] Ecole Polytech Fed Lausanne, Inst Microengn, Opt & Photon Technol Lab, Neuchatel, Switzerland

[4] Ecole Polytech Fed Lausanne, Inst Microengn, Sensors Actuators & Microsyst Lab SAMLAB, CH-2000 Neuchatel, Switzerland

[5] HES SO, Haute Ecole ARC Ingn, Inst Microtechnol Appliquees, CH-2300 La Chaux De Fonds, Switzerland

[6] UNINE, Lab Temps Frequence, CH-2000 Neuchatel, Switzerland

[7] Hochschule Tech FHNW, CH-5210 Windisch, Switzerland

来源：

ANALYST | 2014年 / 139卷 / 09期

关键词：

CAVITY OUTPUT SPECTROSCOPY; ENHANCED PHOTOACOUSTIC-SPECTROSCOPY; CONTINUOUS-WAVE OPERATION; ROOM-TEMPERATURE; HIGH-SENSITIVITY; ABSORPTION-MEASUREMENTS; CARBON-DIOXIDE; RING-DOWN; LASER; COCAINE;

D O I：

10.1039/c3an01462b

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this paper we present two compact, quantum cascade laser absorption spectroscopy based, sensors developed for trace substance detection in gases and liquids. The gas sensor, in its most integrated version, represents the first system combining a quantum cascade laser and a quantum cascade detector. Furthermore, it uses a toroidal mirror cell with a volume of only 40 cm(3) for a path length of up to 4 m. The analytical performance is assessed by the measurements of isotope ratios of CO2 at ambient abundance. For the (CO2)-C-13/(CO2)-C-12 isotope ratio, a measurement precision of 0.2 parts per thousand is demonstrated after an integration time of 600 s. For the liquid sensor, a microfluidic system is used to extract cocaine from saliva into a solvent (PCE) transparent in the mid-infrared. This system is bonded on top of a Si/Ge waveguide and the concentration of cocaine in PCE is measured through the interaction of the evanescent part of the waveguide optical mode and the solvent flowing on top. A detection limit of <100 mu g mL(-1) was achieved with this systemand down to 10 mu g mL(-1) with a simplified, but improved system.

引用

页码：2039 / 2046

页数：8

共 65 条

[1] Sub-ppbv nitric oxide concentration measurements using cw thermoelectrically cooled quantum cascade laser-based integrated cavity output spectroscopy [J].