Simultaneous Detection of 12CH4, 13CH4, and Related Isotope Ratio Exploiting a Frequency-Multiplexed Mid-Infrared Quartz-Enhanced Photoacoustic Sensor
Mariagrazia Olivieri, Arianna Elefante, Giansergio Menduni, Marilena Giglio, Hongpeng Wu, Lei Dong, Pietro Patimisco, Vincenzo Spagnolo, Angelo Sampaolo
TL;DR
A new sensor detects two methane isotopes at once using infrared light, enabling precise real-time analysis for environmental and industrial applications.
Contribution
A dual-gas QEPAS sensor enables simultaneous detection of 12CH4 and 13CH4 with high precision using frequency-multiplexed lasers.
Findings
The sensor achieved a precision of 1‰ in detecting isotopic delta ratio variations for 1% CH4 mixtures.
The system demonstrated a linear response to varying 13CH4 concentrations in methane-based samples.
The sensor is suitable for real-time, high-precision methane isotopic analysis in environmental and industrial settings.
Abstract
We report the development of a dual-gas Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) sensor operating in the mid-infrared range for the simultaneous detection of 12CH4 and 13CH4. The sensor employs a frequency-modulated multiplexing scheme using two distributed-feedback quantum cascade lasers to independently excite the fundamental (fo) and overtone (f 1) vibrational modes of a quartz tuning fork coupled with resonator tubes. The f 0-demodulated signal is dedicated to monitoring 12CH4, while the f 1-demodulated signal selectively quantifies 13CH4, enabling the analysis of the isotopic composition of methane samples. Calibration measurements demonstrated a linear response of the QEPAS signal to varying 13CH4 concentrations in CH4-based samples diluted in N2, with a precision of 1‰ in detecting isotopic delta ratio variations for 1% CH4 mixtures at 0.8 s integration time. The…
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Taxonomy
TopicsSpectroscopy and Laser Applications · Atmospheric and Environmental Gas Dynamics · Gas Sensing Nanomaterials and Sensors