High-precision ethanol measurement by mid-IR laser absorption spectroscopy for metrological applications

被引：15

作者：

Aseev, Oleg ^{[1
]}

Tuzson, Bela ^{[1
]}

Looser, Herbert ^{[1
]}

Scheidegger, Philipp ^{[1
]}

Liu, Chang ^{[1
]}

Morstein, Carina ^{[2
]}

Niederhauser, Bernhard ^{[2
]}

Emmenegger, Lukas ^{[1
]}

机构：

[1] Empa, Lab Air Pollut & Environm Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[2] METAS, Lindenweg 50, CH-3003 Bern, Switzerland

来源：

OPTICS EXPRESS | 2019年 / 27卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

BREATH; STANDARD;

D O I：

10.1364/OE.27.005314

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the development and validation of a compact laser instrument using mid-IR direct absorption spectroscopy (DAS) for high-precision measurements of ethanol in breath-like air mixtures. Leveraging the intermittent continuous wave (iCW) driving for conventional narrow-band distributed feedback (DFB) quantum cascade laser (QCL) emitting around 9.3 mu m and using a 25 m path length multiple-pass absorption cell at reduced pressure, a precision of 9 ppb (amount fraction, nmol mol(-1)) at 60 s integration time is achieved even in the presence of 5% of H2O and CO2. Thus, the instrument is well suitable for metrological studies to investigate observed, but yet unquantified, discrepancies between different breath alcohol reference-generation methods. The approach can be generalized and applied for other organic molecules in a wide range of applications. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：5314 / 5325

页数：12