Hwang, JoonhyukPark, SoobongKo, KiyoungSuk, DaewonLee, Yong-HeeChoi, DukRotermund, FabianKo, Kwang-HoonLee, Hanseuk2025-02-022025-02-021094-4087https://hdl.handle.net/1885/733734614We 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.Samsung Research Funding & Incubation Center of Samsung Electronics (SRFC-IT1801-03); National Research Foundation of Korea (2023R1A2C2004472, 2020R1A4A2002828); Korea Atomic Energy Research Institute Institutional Program (524430-22); Y.H.L. and H.L. acknowledge the support by KAIST Cross-Generation Collaborative Lab project.application/pdfen-AU© 2023 The authors202310.1364/OE.4743922024-01-07Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement