Off-axis cavity-enhanced absorption spectroscopy of 14NH3 in air using a gain-switched frequency comb at 1.514 µm

Satheesh Chandran; Albert A. Ruth; Eamonn P. Martin; Justin K. Alexander; Frank H. Peters; Prince M. Anandarajah

doi:10.3390/s19235217

Off-axis cavity-enhanced absorption spectroscopy of ¹⁴NH₃ in air using a gain-switched frequency comb at 1.514 µm

Satheesh Chandran
, Albert A. Ruth
, Eamonn P. Martin
, Justin K. Alexander
, Frank H. Peters
, Prince M. Anandarajah

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

Abstract

A custom-designed gain-switched frequency comb (GSFC) source was passively coupled to a medium finesse (F ≈ 522) cavity in off-axis configuration for the detection of ammonia (¹⁴NH₃) in static dry air. The absorption of ammonia was detected in the near infrared spectral region between 6604 and 6607 cm⁻¹ using a Fourier transform detection scheme. More than 30 lines of the GSFC output (free spectral range 2.5 GHz) overlapped with the strongest ro-vibrational ammonia absorption features in that spectral region. With the cavity in off-axis configuration, an NH₃ detection limit of ∼3.7 ppmv in 20 s was accomplished in a laboratory environment. The experimental performance of the prototype spectrometer was characterized; advantages, drawbacks and the potential for future applications are discussed.

Original language	English
Article number	5217
Journal	Sensors
Volume	19
Issue number	23
DOIs	https://doi.org/10.3390/s19235217
Publication status	Published - 1 Dec 2019

Keywords

Ammonia detection
Cavity-enhanced absorption spectroscopy
Fourier transform spectroscopy
Frequency comb
Gain switching
Near infrared (IR) range
NH sensing
Off-axis alignment

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10.3390/s19235217

https://hdl.handle.net/10468/9348Licence: CC BY

Cite this

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title = "Off-axis cavity-enhanced absorption spectroscopy of 14NH3 in air using a gain-switched frequency comb at 1.514 µm",

abstract = "A custom-designed gain-switched frequency comb (GSFC) source was passively coupled to a medium finesse (F ≈ 522) cavity in off-axis configuration for the detection of ammonia (14NH3) in static dry air. The absorption of ammonia was detected in the near infrared spectral region between 6604 and 6607 cm−1 using a Fourier transform detection scheme. More than 30 lines of the GSFC output (free spectral range 2.5 GHz) overlapped with the strongest ro-vibrational ammonia absorption features in that spectral region. With the cavity in off-axis configuration, an NH3 detection limit of ∼3.7 ppmv in 20 s was accomplished in a laboratory environment. The experimental performance of the prototype spectrometer was characterized; advantages, drawbacks and the potential for future applications are discussed.",

keywords = "Ammonia detection, Cavity-enhanced absorption spectroscopy, Fourier transform spectroscopy, Frequency comb, Gain switching, Near infrared (IR) range, NH sensing, Off-axis alignment",

author = "Satheesh Chandran and Ruth, \{Albert A.\} and Martin, \{Eamonn P.\} and Alexander, \{Justin K.\} and Peters, \{Frank H.\} and Anandarajah, \{Prince M.\}",

note = "Publisher Copyright: {\textcopyright} 2019 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2019",

month = dec,

day = "1",

doi = "10.3390/s19235217",

language = "English",

volume = "19",

journal = "Sensors",

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TY - JOUR

T1 - Off-axis cavity-enhanced absorption spectroscopy of 14NH3 in air using a gain-switched frequency comb at 1.514 µm

AU - Chandran, Satheesh

AU - Ruth, Albert A.

AU - Martin, Eamonn P.

AU - Alexander, Justin K.

AU - Peters, Frank H.

AU - Anandarajah, Prince M.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - A custom-designed gain-switched frequency comb (GSFC) source was passively coupled to a medium finesse (F ≈ 522) cavity in off-axis configuration for the detection of ammonia (14NH3) in static dry air. The absorption of ammonia was detected in the near infrared spectral region between 6604 and 6607 cm−1 using a Fourier transform detection scheme. More than 30 lines of the GSFC output (free spectral range 2.5 GHz) overlapped with the strongest ro-vibrational ammonia absorption features in that spectral region. With the cavity in off-axis configuration, an NH3 detection limit of ∼3.7 ppmv in 20 s was accomplished in a laboratory environment. The experimental performance of the prototype spectrometer was characterized; advantages, drawbacks and the potential for future applications are discussed.

AB - A custom-designed gain-switched frequency comb (GSFC) source was passively coupled to a medium finesse (F ≈ 522) cavity in off-axis configuration for the detection of ammonia (14NH3) in static dry air. The absorption of ammonia was detected in the near infrared spectral region between 6604 and 6607 cm−1 using a Fourier transform detection scheme. More than 30 lines of the GSFC output (free spectral range 2.5 GHz) overlapped with the strongest ro-vibrational ammonia absorption features in that spectral region. With the cavity in off-axis configuration, an NH3 detection limit of ∼3.7 ppmv in 20 s was accomplished in a laboratory environment. The experimental performance of the prototype spectrometer was characterized; advantages, drawbacks and the potential for future applications are discussed.

KW - Ammonia detection

KW - Cavity-enhanced absorption spectroscopy

KW - Fourier transform spectroscopy

KW - Frequency comb

KW - Gain switching

KW - Near infrared (IR) range

KW - NH sensing

KW - Off-axis alignment

UR - https://www.scopus.com/pages/publications/85075731294

U2 - 10.3390/s19235217

DO - 10.3390/s19235217

M3 - Article

C2 - 31795087

AN - SCOPUS:85075731294

VL - 19

JO - Sensors

JF - Sensors

IS - 23

M1 - 5217

ER -

Off-axis cavity-enhanced absorption spectroscopy of ¹⁴NH₃ in air using a gain-switched frequency comb at 1.514 µm

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Keywords

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