Absorption line profile recovery based on residual amplitude modulation and first harmonic integration methods in photoacoustic gas sensing

Li Li, Norhana Arsad, G. Stewart, G.J. Thursby, B. Culshaw, Yiding Wang

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Two methods for recovery of gas absorption line profiles are presented in this paper using photoacoustic spectroscopy and tunable diode laser spectroscopy (TDLS) with wavelength modulation (WM). A theoretical analysis based on Fourier coefficients is given in order to describe the various components that arise under simultaneous intensity and frequency modulation. The first method makes use of the residual amplitude modulation (RAM) signal which is always present in current modulation of distributed feedback (DFB) tunable diode lasers. The second method involves integration of a near-pure first harmonic derivative signal, separated from other distorting components by appropriate choice of the lock-in detection phase in the case of low modulation index. Good agreement is obtained with both methods between the experimental results and the theoretical simulation for the P17 absorption line of acetylene at 1535.39 nm but the second method gives a much improved accuracy and signal-to-noise ratio in lineshape recovery with photoacoustic spectroscopy.
LanguageEnglish
Pages312-316
Number of pages5
JournalOptics Communications
Volume284
Issue number1
DOIs
Publication statusPublished - 1 Jan 2011

Fingerprint

Photoacoustic effect
Amplitude modulation
Photoacoustic spectroscopy
Gases
recovery
Modulation
harmonics
modulation
Recovery
photoacoustic spectroscopy
Semiconductor lasers
profiles
gases
Gas absorption
Acetylene
Laser spectroscopy
Frequency modulation
Signal to noise ratio
laser spectroscopy
acetylene

Keywords

  • tunable diode
  • laser spectroscopy
  • wavelength modulation
  • absorption line profile recovery
  • residual amplitude modulation
  • first harmonic integration

Cite this

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abstract = "Two methods for recovery of gas absorption line profiles are presented in this paper using photoacoustic spectroscopy and tunable diode laser spectroscopy (TDLS) with wavelength modulation (WM). A theoretical analysis based on Fourier coefficients is given in order to describe the various components that arise under simultaneous intensity and frequency modulation. The first method makes use of the residual amplitude modulation (RAM) signal which is always present in current modulation of distributed feedback (DFB) tunable diode lasers. The second method involves integration of a near-pure first harmonic derivative signal, separated from other distorting components by appropriate choice of the lock-in detection phase in the case of low modulation index. Good agreement is obtained with both methods between the experimental results and the theoretical simulation for the P17 absorption line of acetylene at 1535.39 nm but the second method gives a much improved accuracy and signal-to-noise ratio in lineshape recovery with photoacoustic spectroscopy.",
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Absorption line profile recovery based on residual amplitude modulation and first harmonic integration methods in photoacoustic gas sensing. / Li, Li; Arsad, Norhana; Stewart, G.; Thursby, G.J.; Culshaw, B.; Wang, Yiding.

In: Optics Communications, Vol. 284, No. 1, 01.01.2011, p. 312-316.

Research output: Contribution to journalArticle

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AU - Arsad, Norhana

AU - Stewart, G.

AU - Thursby, G.J.

AU - Culshaw, B.

AU - Wang, Yiding

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