We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air. With the aim of developing a lightweight, compact, low-power-consumption sensor suitable for unmanned aerial vehicles (UAVs)-empowered environmental monitoring, an all-fiber configuration was designed and realized. Two laser diodes emitting at 1653.7 nm and 1684 nm for CH4 and C2H6 detection, respectively, were fiber-combined and fiber-coupled to the collimator port of the acoustic detection module. No cross talk between methane and ethane QEPAS signal was observed, and the related peak signals were well resolved. The QEPAS sensor was calibrated using gas samples generated from certified concentrations of 1% CH4 in N2 and 1% C2H6 in N2. At a lock-in integration time of 100 ms, minimum detection limits of 0.76 ppm and 34 ppm for methane and ethane were achieved, respectively. The relaxation rate of CH4 in standard air has been investigated considering the effects of H2O, N2 and O2 molecules. No influence on the CH4 QEPAS signal is expected when the water vapor concentration level present in air varies in the range 0.6–3%.

Fiber-Coupled Quartz-Enhanced Photoacoustic Spectroscopy System for Methane and Ethane Monitoring in the Near-Infrared Spectral Range / Menduni, Giansergio; Sgobba, Fabrizio; Russo, Stefano Dello; Ranieri, Ada Cristina; Sampaolo, Angelo; Patimisco, Pietro; Giglio, Marilena; Passaro, Vittorio M. N.; Csutak, Sebastian; Assante, Dario; Ranieri, Ezio; Geoffrion, Eric; Spagnolo, Vincenzo. - In: MOLECULES. - ISSN 1420-3049. - ELETTRONICO. - 25:23(2020). [10.3390/molecules25235607]

Fiber-Coupled Quartz-Enhanced Photoacoustic Spectroscopy System for Methane and Ethane Monitoring in the Near-Infrared Spectral Range

Menduni, Giansergio;Sampaolo, Angelo;Patimisco, Pietro;Giglio, Marilena;Passaro, Vittorio M. N.;Ranieri, Ezio;Spagnolo, Vincenzo
2020-01-01

Abstract

We report on a fiber-coupled, quartz-enhanced photoacoustic spectroscopy (QEPAS) near-IR sensor for sequential detection of methane (CH4 or C1) and ethane (C2H6 or C2) in air. With the aim of developing a lightweight, compact, low-power-consumption sensor suitable for unmanned aerial vehicles (UAVs)-empowered environmental monitoring, an all-fiber configuration was designed and realized. Two laser diodes emitting at 1653.7 nm and 1684 nm for CH4 and C2H6 detection, respectively, were fiber-combined and fiber-coupled to the collimator port of the acoustic detection module. No cross talk between methane and ethane QEPAS signal was observed, and the related peak signals were well resolved. The QEPAS sensor was calibrated using gas samples generated from certified concentrations of 1% CH4 in N2 and 1% C2H6 in N2. At a lock-in integration time of 100 ms, minimum detection limits of 0.76 ppm and 34 ppm for methane and ethane were achieved, respectively. The relaxation rate of CH4 in standard air has been investigated considering the effects of H2O, N2 and O2 molecules. No influence on the CH4 QEPAS signal is expected when the water vapor concentration level present in air varies in the range 0.6–3%.
2020
Fiber-Coupled Quartz-Enhanced Photoacoustic Spectroscopy System for Methane and Ethane Monitoring in the Near-Infrared Spectral Range / Menduni, Giansergio; Sgobba, Fabrizio; Russo, Stefano Dello; Ranieri, Ada Cristina; Sampaolo, Angelo; Patimisco, Pietro; Giglio, Marilena; Passaro, Vittorio M. N.; Csutak, Sebastian; Assante, Dario; Ranieri, Ezio; Geoffrion, Eric; Spagnolo, Vincenzo. - In: MOLECULES. - ISSN 1420-3049. - ELETTRONICO. - 25:23(2020). [10.3390/molecules25235607]
File in questo prodotto:
File Dimensione Formato  
123_molecules-methane-Ethane_2020.pdf

accesso aperto

Descrizione: Articolo principale
Tipologia: Versione editoriale
Licenza: Creative commons
Dimensione 2.11 MB
Formato Adobe PDF
2.11 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/210975
Citazioni
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 25
social impact