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High-resolution trace gas detection by sub-Doppler noise-immune cavity-enhanced optical heterodyne molecular spectrometry: application to detection of acetylene in human breath
Umeå University, Faculty of Science and Technology, Department of Physics. State Key Laboratory of Quantum Optics & Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 030006 Taiyuan, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, 030006 Taiyuan, China .ORCID iD: 0000-0002-3966-8943
Umeå University, Faculty of Science and Technology, Department of Physics. National Metrology Institute VTT MIKES, Tekniikantie 1, FI-02044 VTT, Finland.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.ORCID iD: 0000-0002-5065-7786
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 13, p. 17940-17953Article in journal (Refereed) Published
Abstract [en]

A sensitive high-resolution sub-Doppler detecting spectrometer, based on noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS), for trace gas detection of species whose transitions have severe spectral overlap with abundant concomitant species is presented. It is designed around a NICE-OHMS instrumentation utilizing balanced detection that provides shot-noise limited Doppler-broadened (Db) detection. By synchronous dithering the positions of the two cavity mirrors, the effect of residual etalons between the cavity and other surfaces in the system could be reduced. An Allan deviation of the absorption coefficient of 2.2 × 10-13 cm-1 at 60 s, which, for the targeted transition in C2H2, corresponds to a 3σ detection sensitivity of 130 ppt, is demonstrated. It is shown that despite significant spectral interference from CO2 at the targeted transition, which precludes Db detection of C2H2, acetylene could be detected in exhaled breath of healthy smokers.

Place, publisher, year, edition, pages
Optical Society of America, 2019. Vol. 27, no 13, p. 17940-17953
National Category
Atom and Molecular Physics and Optics Physical Chemistry Medical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-161422DOI: 10.1364/OE.27.017940ISI: 000472621000043PubMedID: 31252745OAI: oai:DiVA.org:umu-161422DiVA, id: diva2:1335738
Funder
Swedish Research Council, 2015-04374Swedish Research Council, 2013-6031The Kempe Foundations, JCK-1317The Kempe Foundations, SMK-1446Available from: 2019-07-07 Created: 2019-07-07 Last updated: 2019-07-25Bibliographically approved

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Zhao, GangHausmaninger, ThomasSchmidt, Florian M.Axner, Ove
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