Gas detection based on optical correlation spectroscopy using a single light source

Amy Cheung, Walter Johnstone, David Moodie

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

An alternative method of gas detection using optical correlation spectroscopy (OCS) has been investigated. A semiconductor optical amplifier (SOA) is employed to transmit broadband light through a reference and measurement cell containing the absorbing species, and the required 180° phase shift between the reference and measurement signal is achieved using an optical fibre delay line. The use of a single SOA light source reduces zero point drift errors that arise when two light sources are utilized and provides high compatibility with single mode optical fibre systems. A theoretical minimum detectable concentration of 0.15 ppm.m has been calculated and experimental results have been obtained for varying concentrations of acetylene (C2H2) gas at different pressures. The theoretical system response was determined using absorption data from the HITRAN database and compares well with the experimental results. Signal-to-noise ratio (SNR) analysis has been performed for our experimental system and an ideal system with minimal losses, an optimum filter and longer cell lengths.
Original languageEnglish
Pages (from-to)1107-1112
Number of pages5
JournalMeasurement Science and Technology
Volume17
Issue number5
DOIs
Publication statusPublished - 2006

Fingerprint

Optical correlation
Semiconductor optical amplifiers
light amplifiers
Light sources
Spectroscopy
Optical fibers
light sources
optical fibers
Semiconductor Optical Amplifier
signal measurement
Electric delay lines
delay lines
Acetylene
Single mode fibers
cells
Gases
gases
Phase shift
acetylene
compatibility

Keywords

  • absorption
  • correlation spectroscopy
  • gas detection
  • semiconductor optical amplifiers

Cite this

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abstract = "An alternative method of gas detection using optical correlation spectroscopy (OCS) has been investigated. A semiconductor optical amplifier (SOA) is employed to transmit broadband light through a reference and measurement cell containing the absorbing species, and the required 180° phase shift between the reference and measurement signal is achieved using an optical fibre delay line. The use of a single SOA light source reduces zero point drift errors that arise when two light sources are utilized and provides high compatibility with single mode optical fibre systems. A theoretical minimum detectable concentration of 0.15 ppm.m has been calculated and experimental results have been obtained for varying concentrations of acetylene (C2H2) gas at different pressures. The theoretical system response was determined using absorption data from the HITRAN database and compares well with the experimental results. Signal-to-noise ratio (SNR) analysis has been performed for our experimental system and an ideal system with minimal losses, an optimum filter and longer cell lengths.",
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Gas detection based on optical correlation spectroscopy using a single light source. / Cheung, Amy; Johnstone, Walter; Moodie, David.

In: Measurement Science and Technology, Vol. 17, No. 5, 2006, p. 1107-1112.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Gas detection based on optical correlation spectroscopy using a single light source

AU - Cheung, Amy

AU - Johnstone, Walter

AU - Moodie, David

PY - 2006

Y1 - 2006

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AB - An alternative method of gas detection using optical correlation spectroscopy (OCS) has been investigated. A semiconductor optical amplifier (SOA) is employed to transmit broadband light through a reference and measurement cell containing the absorbing species, and the required 180° phase shift between the reference and measurement signal is achieved using an optical fibre delay line. The use of a single SOA light source reduces zero point drift errors that arise when two light sources are utilized and provides high compatibility with single mode optical fibre systems. A theoretical minimum detectable concentration of 0.15 ppm.m has been calculated and experimental results have been obtained for varying concentrations of acetylene (C2H2) gas at different pressures. The theoretical system response was determined using absorption data from the HITRAN database and compares well with the experimental results. Signal-to-noise ratio (SNR) analysis has been performed for our experimental system and an ideal system with minimal losses, an optimum filter and longer cell lengths.

KW - absorption

KW - correlation spectroscopy

KW - gas detection

KW - semiconductor optical amplifiers

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