Remote methane sensor using raman amplified open path TDLS

D.M. Mitchell, K. Duffin, W. Johnstone

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

Reported here is a long-range optical methane sensor designed with the purpose of enabling more efficient leak monitoring of natural gas pipelines, oil rigs and gas containers including ships. Combining sensitive Wavelength Modulation Spectroscopy (WMS) and a high power Raman amplifier system, the sensor launches a high power 1650.95nm signal at an inspection
site at a distance of around 100m and analyses the backscatter via a large Fresnel lens to detect methane concentrations of 100ppm in a 1m gas cloud up to 100%. The work comprises the design and testing of a low-noise high-power fibre Raman amplifier system as a remote methane sensing source. Seeded by a single-mode 1650.95nm laser (DFB), upon which the WMS modulation is applied, the Raman amplifier produces a highpower, narrow-band methane sensing signal. Key to the system’s competitive advantage is its low cost, small size, low weight, high reliability and superior performance when compared
to bulk long-range airborne systems. This results from designing a fibre based system that is constructed entirely from standard communications fibre and components. Lab trials at 11m have been conducted and show by extrapolation that a 1m cloud of methane at a concentration of 100ppm can be detected with a signal to noise ratio of 3:1 at a range of >100m.

Conference

Conference7th International Conference on Tunable Diode Laser Spectroscopy
CityZermatt, Switzerland
Period13/07/0917/07/09

Fingerprint

Methane
Sensors
Modulation
Fibers
Spectroscopy
Wavelength
Natural gas pipelines
Distributed feedback lasers
Laser modes
Gases
Extrapolation
Containers
Light sources
Lenses
Signal to noise ratio
Ships
Monitoring
Communication
Testing
Costs

Keywords

  • optical methane sensor
  • wavelength modulation spectroscopy
  • raman amplifier
  • yunable diode laser spectroscopy

Cite this

Mitchell, D. M., Duffin, K., & Johnstone, W. (2009). Remote methane sensor using raman amplified open path TDLS. 34. Paper presented at 7th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, .
Mitchell, D.M. ; Duffin, K. ; Johnstone, W. / Remote methane sensor using raman amplified open path TDLS. Paper presented at 7th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, .1 p.
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keywords = "optical methane sensor, wavelength modulation spectroscopy, raman amplifier, yunable diode laser spectroscopy",
author = "D.M. Mitchell and K. Duffin and W. Johnstone",
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language = "English",
pages = "34",
note = "7th International Conference on Tunable Diode Laser Spectroscopy ; Conference date: 13-07-2009 Through 17-07-2009",

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Mitchell, DM, Duffin, K & Johnstone, W 2009, 'Remote methane sensor using raman amplified open path TDLS' Paper presented at 7th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, 13/07/09 - 17/07/09, pp. 34.

Remote methane sensor using raman amplified open path TDLS. / Mitchell, D.M.; Duffin, K.; Johnstone, W.

2009. 34 Paper presented at 7th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Remote methane sensor using raman amplified open path TDLS

AU - Mitchell, D.M.

AU - Duffin, K.

AU - Johnstone, W.

PY - 2009/7

Y1 - 2009/7

N2 - Reported here is a long-range optical methane sensor designed with the purpose of enabling more efficient leak monitoring of natural gas pipelines, oil rigs and gas containers including ships. Combining sensitive Wavelength Modulation Spectroscopy (WMS) and a high power Raman amplifier system, the sensor launches a high power 1650.95nm signal at an inspection site at a distance of around 100m and analyses the backscatter via a large Fresnel lens to detect methane concentrations of 100ppm in a 1m gas cloud up to 100%. The work comprises the design and testing of a low-noise high-power fibre Raman amplifier system as a remote methane sensing source. Seeded by a single-mode 1650.95nm laser (DFB), upon which the WMS modulation is applied, the Raman amplifier produces a highpower, narrow-band methane sensing signal. Key to the system’s competitive advantage is its low cost, small size, low weight, high reliability and superior performance when compared to bulk long-range airborne systems. This results from designing a fibre based system that is constructed entirely from standard communications fibre and components. Lab trials at 11m have been conducted and show by extrapolation that a 1m cloud of methane at a concentration of 100ppm can be detected with a signal to noise ratio of 3:1 at a range of >100m.

AB - Reported here is a long-range optical methane sensor designed with the purpose of enabling more efficient leak monitoring of natural gas pipelines, oil rigs and gas containers including ships. Combining sensitive Wavelength Modulation Spectroscopy (WMS) and a high power Raman amplifier system, the sensor launches a high power 1650.95nm signal at an inspection site at a distance of around 100m and analyses the backscatter via a large Fresnel lens to detect methane concentrations of 100ppm in a 1m gas cloud up to 100%. The work comprises the design and testing of a low-noise high-power fibre Raman amplifier system as a remote methane sensing source. Seeded by a single-mode 1650.95nm laser (DFB), upon which the WMS modulation is applied, the Raman amplifier produces a highpower, narrow-band methane sensing signal. Key to the system’s competitive advantage is its low cost, small size, low weight, high reliability and superior performance when compared to bulk long-range airborne systems. This results from designing a fibre based system that is constructed entirely from standard communications fibre and components. Lab trials at 11m have been conducted and show by extrapolation that a 1m cloud of methane at a concentration of 100ppm can be detected with a signal to noise ratio of 3:1 at a range of >100m.

KW - optical methane sensor

KW - wavelength modulation spectroscopy

KW - raman amplifier

KW - yunable diode laser spectroscopy

UR - http://tdls.conncoll.edu/2009/ABSTRACTBOOK2009.pdf

UR - http://tdls.conncoll.edu/2009/

M3 - Paper

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ER -

Mitchell DM, Duffin K, Johnstone W. Remote methane sensor using raman amplified open path TDLS. 2009. Paper presented at 7th International Conference on Tunable Diode Laser Spectroscopy, Zermatt, Switzerland, .