High-resolution trace gas detection by sub-Doppler noise-immune cavity-enhanced optical heterodyne molecular spectrometry: Application to detection of acetylene in human breath

Gang Zhao, Thomas Hausmaninger, Florian M. Schmidt, Weiguang Ma, Ove Axner (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)17940-17953
    Number of pages14
    JournalOptics Express
    Volume27
    Issue number13
    DOIs
    Publication statusPublished - 1 Jan 2019
    MoE publication typeA1 Journal article-refereed

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