Absorption line profile recovery based on TDLS and MEMS micro-mirror for photoacoustic gas sensing

Li Li, Norhana Arsad, George Stewart, Graham Thursby, Deepak Uttamchandani, Brian Culshaw, Yi Ding Wang

Research output: Contribution to journalArticle

Abstract

A novel and efficient absorption line recovery technique is presented. A micro-electromechanical systems (MEMS) mirror driven by an electrothermal actuator is used to generate laser intensity modulation through the mirror reflection. Tunable diode laser spectroscopy (TDLS) and photoacoustic spectroscopy (PAS) are used to recover the target absorption line profile which is compared with the theoretical Voigt profile. The target gas is 0.01% acetylene (C2H2) in a nitrogen host gas. The laser diode wavelength is swept across the P17 absorption line of acetylene at 1535.4 nm by a current ramp, and an erbium-doped fibre amplifier (EDFA) is used to enhance the optical intensity and increase the signal-to-noise ratio (SNR). A SNR of about 35 is obtained with 100 mW laser power from the EDFA. Good agreement is achieved between the experimental results and the theoretical simulation for the P17 absorption line profile.

Original languageEnglish
Pages (from-to)1814-1818
Number of pages5
JournalGuang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Volume31
Issue number7
DOIs
Publication statusPublished - Jul 2011
Externally publishedYes

Fingerprint

Acetylene
Erbium doped fiber amplifiers
Laser spectroscopy
Photoacoustic effect
laser spectroscopy
microelectromechanical systems
MEMS
Semiconductor lasers
Signal to noise ratio
Mirrors
Gases
recovery
diodes
mirrors
Photoacoustic spectroscopy
Recovery
Lasers
profiles
gases
acetylene

Keywords

  • Absorption line profile recovery
  • Laser intensity modulation
  • Micro-electro-mechanical-systems (MEMS)
  • Photo-acoustic gas sensing
  • Tunable diode laser spectroscopy

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

Cite this

Absorption line profile recovery based on TDLS and MEMS micro-mirror for photoacoustic gas sensing. / Li, Li; Arsad, Norhana; Stewart, George; Thursby, Graham; Uttamchandani, Deepak; Culshaw, Brian; Wang, Yi Ding.

In: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis, Vol. 31, No. 7, 07.2011, p. 1814-1818.

Research output: Contribution to journalArticle

Li, Li ; Arsad, Norhana ; Stewart, George ; Thursby, Graham ; Uttamchandani, Deepak ; Culshaw, Brian ; Wang, Yi Ding. / Absorption line profile recovery based on TDLS and MEMS micro-mirror for photoacoustic gas sensing. In: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis. 2011 ; Vol. 31, No. 7. pp. 1814-1818.
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abstract = "A novel and efficient absorption line recovery technique is presented. A micro-electromechanical systems (MEMS) mirror driven by an electrothermal actuator is used to generate laser intensity modulation through the mirror reflection. Tunable diode laser spectroscopy (TDLS) and photoacoustic spectroscopy (PAS) are used to recover the target absorption line profile which is compared with the theoretical Voigt profile. The target gas is 0.01{\%} acetylene (C2H2) in a nitrogen host gas. The laser diode wavelength is swept across the P17 absorption line of acetylene at 1535.4 nm by a current ramp, and an erbium-doped fibre amplifier (EDFA) is used to enhance the optical intensity and increase the signal-to-noise ratio (SNR). A SNR of about 35 is obtained with 100 mW laser power from the EDFA. Good agreement is achieved between the experimental results and the theoretical simulation for the P17 absorption line profile.",
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AU - Uttamchandani, Deepak

AU - Culshaw, Brian

AU - Wang, Yi Ding

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