Quantitative gas pressure measurement by molecular spectroscopy using chip-based supercontinuum in the mid-infrared

Joonhyuk Hwang, Soobong Park, Kiyoung Ko, Daewon Suk, Yong Hee Lee, Duk Yong Choi, Fabian Rotermund, Kwang Hoon Ko, Hansuek Lee

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    We demonstrate the quantitative pressure measurement of gas molecules in the mid-infrared using chip-based supercontinuum and cepstrum analysis without additional measurements for baseline normalization. A supercontinuum generated in an on-chip waveguide made of chalcogenide glass having high nonlinearity passes through CO gas and provides a transmission spectrum. The gas absorption information is deconvoluted from the original supercontinuum spectral information containing temporal fluctuation by cepstrum analysis and extracted simply by applying a bandpass filter in the temporal domain. The gas pressure estimated from the extracted absorption information is consistent with the value measured by a pressure gauge within a difference of 1.25%, despite spectral fluctuations in the supercontinuum baseline comparable to the spectral depth of the gas absorption lines.

    Original languageEnglish
    Pages (from-to)35624-35631
    Number of pages8
    JournalOptics Express
    Volume31
    Issue number22
    DOIs
    Publication statusPublished - 23 Oct 2023

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