A Dual-Domain Multiplexed QEPAS System for Multispecies Gas Detection Based on Wavelength-Selective LPFG

Chong Niu; Chupeng Lu; Haiyue Sun; Shunda Qiao; Ying He; Tao Geng; Yufei Ma

doi:10.1021/acs.analchem.6c03260

A Dual-Domain Multiplexed QEPAS System for Multispecies Gas Detection Based on Wavelength-Selective LPFG

Chong Niu
, Chupeng Lu
, Haiyue Sun
, Shunda Qiao
, Ying He
, Tao Geng^*
, Yufei Ma^*

^*Corresponding author for this work

School of Astronautics

Harbin Institute of Technology
Harbin Engineering University

Research output: Contribution to journal › Article › peer-review

Abstract

We propose a novel method for trace detection of multicomponent gases by combining optical mode multiplexing based on long-period fiber gratings (LPFGs) with frequency multiplexing of quartz tuning forks (QTFs). By leveraging the advantages of LPFGs, including flexible mode selection and high mechanical robustness, a three-channel LPFG-based quartz-enhanced photoacoustic spectroscopy (LPFG-QEPAS) sensor was constructed for the first time to simultaneously detect H₂O, CH₄, and C₂H₂, with minimum detection limits (MDLs) of 4.85, 8.12, and 2.88 ppm, respectively. This work represents the first integration of optical fibers with a QEPAS system for multicomponent trace gas detection. Featuring no requirement for complex and precise spatial optical alignment and allowing flexible selection of target gas components, this method is expected to be highly valuable for multicomponent, multifunctional gas sensing applications.

Original language	English
Pages (from-to)	19872-19881
Number of pages	10
Journal	Analytical Chemistry
Volume	98
Issue number	26
DOIs	https://doi.org/10.1021/acs.analchem.6c03260
State	Published - 7 Jul 2026

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title = "A Dual-Domain Multiplexed QEPAS System for Multispecies Gas Detection Based on Wavelength-Selective LPFG",

abstract = "We propose a novel method for trace detection of multicomponent gases by combining optical mode multiplexing based on long-period fiber gratings (LPFGs) with frequency multiplexing of quartz tuning forks (QTFs). By leveraging the advantages of LPFGs, including flexible mode selection and high mechanical robustness, a three-channel LPFG-based quartz-enhanced photoacoustic spectroscopy (LPFG-QEPAS) sensor was constructed for the first time to simultaneously detect H2O, CH4, and C2H2, with minimum detection limits (MDLs) of 4.85, 8.12, and 2.88 ppm, respectively. This work represents the first integration of optical fibers with a QEPAS system for multicomponent trace gas detection. Featuring no requirement for complex and precise spatial optical alignment and allowing flexible selection of target gas components, this method is expected to be highly valuable for multicomponent, multifunctional gas sensing applications.",

author = "Chong Niu and Chupeng Lu and Haiyue Sun and Shunda Qiao and Ying He and Tao Geng and Yufei Ma",

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doi = "10.1021/acs.analchem.6c03260",

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T1 - A Dual-Domain Multiplexed QEPAS System for Multispecies Gas Detection Based on Wavelength-Selective LPFG

AU - Niu, Chong

AU - Lu, Chupeng

AU - Sun, Haiyue

AU - Qiao, Shunda

AU - He, Ying

AU - Geng, Tao

AU - Ma, Yufei

PY - 2026/7/7

Y1 - 2026/7/7

N2 - We propose a novel method for trace detection of multicomponent gases by combining optical mode multiplexing based on long-period fiber gratings (LPFGs) with frequency multiplexing of quartz tuning forks (QTFs). By leveraging the advantages of LPFGs, including flexible mode selection and high mechanical robustness, a three-channel LPFG-based quartz-enhanced photoacoustic spectroscopy (LPFG-QEPAS) sensor was constructed for the first time to simultaneously detect H2O, CH4, and C2H2, with minimum detection limits (MDLs) of 4.85, 8.12, and 2.88 ppm, respectively. This work represents the first integration of optical fibers with a QEPAS system for multicomponent trace gas detection. Featuring no requirement for complex and precise spatial optical alignment and allowing flexible selection of target gas components, this method is expected to be highly valuable for multicomponent, multifunctional gas sensing applications.

AB - We propose a novel method for trace detection of multicomponent gases by combining optical mode multiplexing based on long-period fiber gratings (LPFGs) with frequency multiplexing of quartz tuning forks (QTFs). By leveraging the advantages of LPFGs, including flexible mode selection and high mechanical robustness, a three-channel LPFG-based quartz-enhanced photoacoustic spectroscopy (LPFG-QEPAS) sensor was constructed for the first time to simultaneously detect H2O, CH4, and C2H2, with minimum detection limits (MDLs) of 4.85, 8.12, and 2.88 ppm, respectively. This work represents the first integration of optical fibers with a QEPAS system for multicomponent trace gas detection. Featuring no requirement for complex and precise spatial optical alignment and allowing flexible selection of target gas components, this method is expected to be highly valuable for multicomponent, multifunctional gas sensing applications.

UR - https://www.scopus.com/pages/publications/105044250356

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DO - 10.1021/acs.analchem.6c03260

M3 - 文章

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VL - 98

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EP - 19881

JO - Analytical Chemistry

JF - Analytical Chemistry

IS - 26

ER -

A Dual-Domain Multiplexed QEPAS System for Multispecies Gas Detection Based on Wavelength-Selective LPFG

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