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Updated: Jan 8, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Simultaneous Detection of 12CH4, 13CH4, and Related Isotope Ratio Exploiting a Frequency-Multiplexed Mid-Infrared

Mariagrazia Olivieri1, Arianna Elefante2, Giansergio Menduni1

  • 1Polysense Lab, Dipartimento Interateneo di Fisica, University and Politecnico of Bari, Via Amendola 173, Bari 70126, Italy.

ACS Sensors
|December 15, 2025
PubMed
Abstract

Keywords:
frequency multiplexingisotopic composition analysismethane isotopologuesquartz-enhanced photoacoustic spectroscopysimultaneous detection

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