Highly sensitive acetylene detection based on a compact multi-pass gas cell and optimized wavelength modulation technique

Haiyue Sun; Y. Ma; Ying He; Shunda Qiao; Xiaotao Yang; Frank K. Tittel

doi:10.1016/j.infrared.2019.103012

Highly sensitive acetylene detection based on a compact multi-pass gas cell and optimized wavelength modulation technique

Haiyue Sun
, Y. Ma^*
, Ying He
, Shunda Qiao
, Xiaotao Yang
, Frank K. Tittel

^*Corresponding author for this work

School of Astronautics

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

25 Scopus citations

Abstract

A highly sensitive acetylene (C₂H₂) sensor system was demonstrated using tunable diode laser absorption spectroscopy (TDLAS) based on a compact multi-pass gas cell with a 10 m optical path. The sensor system can work in two measurement modes: direct measurements and wavelength modulation (WMS). The incident laser beam with a small spot radius (0.5 mm) effectively eliminated interference fringes and improved the signal-to-noise ratio. The minimum detection limit (MDL) of the direct detection mode was 4.9 ppm. As for the wavelength modulation method, after optimization the modulation depth, a MDL of 14.3 ppb was obtained. The corresponding noise-equivalent absorbance (NEA) was calculated and obtained an excellent value of 1.8 × 10^-8 cm^-1 Hz^−1/2. An Allan deviation analysis was used to analyze the system stability. The MDL was improved to 1.3 ppb when the averaging time was 270 s.

Original language	English
Article number	103012
Journal	Infrared Physics and Technology
Volume	102
DOIs	https://doi.org/10.1016/j.infrared.2019.103012
State	Published - Nov 2019

Keywords

Optimum modulation depth
TDLAS
Trace CH detection
Wavelength modulation spectroscopy

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10.1016/j.infrared.2019.103012

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@article{b0d769dea646423ca89851579dd1fcd4,

title = "Highly sensitive acetylene detection based on a compact multi-pass gas cell and optimized wavelength modulation technique",

abstract = "A highly sensitive acetylene (C2H2) sensor system was demonstrated using tunable diode laser absorption spectroscopy (TDLAS) based on a compact multi-pass gas cell with a 10 m optical path. The sensor system can work in two measurement modes: direct measurements and wavelength modulation (WMS). The incident laser beam with a small spot radius (0.5 mm) effectively eliminated interference fringes and improved the signal-to-noise ratio. The minimum detection limit (MDL) of the direct detection mode was 4.9 ppm. As for the wavelength modulation method, after optimization the modulation depth, a MDL of 14.3 ppb was obtained. The corresponding noise-equivalent absorbance (NEA) was calculated and obtained an excellent value of 1.8 × 10-8 cm-1 Hz−1/2. An Allan deviation analysis was used to analyze the system stability. The MDL was improved to 1.3 ppb when the averaging time was 270 s.",

keywords = "Optimum modulation depth, TDLAS, Trace CH detection, Wavelength modulation spectroscopy",

author = "Haiyue Sun and Y. Ma and Ying He and Shunda Qiao and Xiaotao Yang and Tittel, \{Frank K.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = nov,

doi = "10.1016/j.infrared.2019.103012",

language = "英语",

volume = "102",

journal = "Infrared Physics and Technology",

issn = "1350-4495",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Highly sensitive acetylene detection based on a compact multi-pass gas cell and optimized wavelength modulation technique

AU - Sun, Haiyue

AU - Ma, Y.

AU - He, Ying

AU - Qiao, Shunda

AU - Yang, Xiaotao

AU - Tittel, Frank K.

PY - 2019/11

Y1 - 2019/11

N2 - A highly sensitive acetylene (C2H2) sensor system was demonstrated using tunable diode laser absorption spectroscopy (TDLAS) based on a compact multi-pass gas cell with a 10 m optical path. The sensor system can work in two measurement modes: direct measurements and wavelength modulation (WMS). The incident laser beam with a small spot radius (0.5 mm) effectively eliminated interference fringes and improved the signal-to-noise ratio. The minimum detection limit (MDL) of the direct detection mode was 4.9 ppm. As for the wavelength modulation method, after optimization the modulation depth, a MDL of 14.3 ppb was obtained. The corresponding noise-equivalent absorbance (NEA) was calculated and obtained an excellent value of 1.8 × 10-8 cm-1 Hz−1/2. An Allan deviation analysis was used to analyze the system stability. The MDL was improved to 1.3 ppb when the averaging time was 270 s.

AB - A highly sensitive acetylene (C2H2) sensor system was demonstrated using tunable diode laser absorption spectroscopy (TDLAS) based on a compact multi-pass gas cell with a 10 m optical path. The sensor system can work in two measurement modes: direct measurements and wavelength modulation (WMS). The incident laser beam with a small spot radius (0.5 mm) effectively eliminated interference fringes and improved the signal-to-noise ratio. The minimum detection limit (MDL) of the direct detection mode was 4.9 ppm. As for the wavelength modulation method, after optimization the modulation depth, a MDL of 14.3 ppb was obtained. The corresponding noise-equivalent absorbance (NEA) was calculated and obtained an excellent value of 1.8 × 10-8 cm-1 Hz−1/2. An Allan deviation analysis was used to analyze the system stability. The MDL was improved to 1.3 ppb when the averaging time was 270 s.

KW - Optimum modulation depth

KW - TDLAS

KW - Trace CH detection

KW - Wavelength modulation spectroscopy

UR - https://www.scopus.com/pages/publications/85070626357

U2 - 10.1016/j.infrared.2019.103012

DO - 10.1016/j.infrared.2019.103012

M3 - 文章

AN - SCOPUS:85070626357

SN - 1350-4495

VL - 102

JO - Infrared Physics and Technology

JF - Infrared Physics and Technology

M1 - 103012

ER -

Highly sensitive acetylene detection based on a compact multi-pass gas cell and optimized wavelength modulation technique

Abstract

Keywords

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