Simultaneous detection of methane, oxygen and water vapour utilising near-infrared diode lasers in conjunction with difference-frequency generation
(2000) In Applied Physics B 71(6). p.853-857- Abstract
- An all-diode-laser-based spectrometer is used for the simultaneous detection of methane, oxygen and water vapour. This is accomplished using a 760-nm diode laser and a 980-nm diode laser in conjunction with difference-frequency generation to 3.4 mum in a periodically poled lithium niobate crystal. Each of the output wavelengths is resonant with one of the molecular species. Simultaneous recordings over a 15-m open path of laboratory air are demonstrated. The recording scheme shows the wide applicability of a diode-laser-based difference-frequency spectrometer for the detection of molecular species in different wavelength ranges. By increasing the frequency of the 760-nm diode laser and decreasing the frequency of the 980-nm diode laser, a... (More)
- An all-diode-laser-based spectrometer is used for the simultaneous detection of methane, oxygen and water vapour. This is accomplished using a 760-nm diode laser and a 980-nm diode laser in conjunction with difference-frequency generation to 3.4 mum in a periodically poled lithium niobate crystal. Each of the output wavelengths is resonant with one of the molecular species. Simultaneous recordings over a 15-m open path of laboratory air are demonstrated. The recording scheme shows the wide applicability of a diode-laser-based difference-frequency spectrometer for the detection of molecular species in different wavelength ranges. By increasing the frequency of the 760-nm diode laser and decreasing the frequency of the 980-nm diode laser, a maximum continuous tuning range in the mid infrared of 3.6 cm(-1) is achieved. This enables the recording of several methane lines at atmospheric pressure. Pressure-dependence studies of methane lineshapes are also performed in an absorption cell. An indoor-air methane background level of 3 ppm is measured. The signal-to-noise ratio in the recorded methane spectra indicates that sub-ppm detection of methane at atmospheric pressure is feasible. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2258301
- author
- Gustafsson, U ; Sandsten, J and Svanberg, Sune LU
- organization
- publishing date
- 2000
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Physics B
- volume
- 71
- issue
- 6
- pages
- 853 - 857
- publisher
- Springer
- external identifiers
-
- scopus:0000085024
- ISSN
- 0946-2171
- DOI
- 10.1007/s003400000431
- language
- English
- LU publication?
- yes
- id
- 022298b4-4874-4eb7-b6cf-cfa4e3a3ce6c (old id 2258301)
- date added to LUP
- 2016-04-01 12:25:54
- date last changed
- 2022-01-27 03:38:32
@article{022298b4-4874-4eb7-b6cf-cfa4e3a3ce6c,
abstract = {{An all-diode-laser-based spectrometer is used for the simultaneous detection of methane, oxygen and water vapour. This is accomplished using a 760-nm diode laser and a 980-nm diode laser in conjunction with difference-frequency generation to 3.4 mum in a periodically poled lithium niobate crystal. Each of the output wavelengths is resonant with one of the molecular species. Simultaneous recordings over a 15-m open path of laboratory air are demonstrated. The recording scheme shows the wide applicability of a diode-laser-based difference-frequency spectrometer for the detection of molecular species in different wavelength ranges. By increasing the frequency of the 760-nm diode laser and decreasing the frequency of the 980-nm diode laser, a maximum continuous tuning range in the mid infrared of 3.6 cm(-1) is achieved. This enables the recording of several methane lines at atmospheric pressure. Pressure-dependence studies of methane lineshapes are also performed in an absorption cell. An indoor-air methane background level of 3 ppm is measured. The signal-to-noise ratio in the recorded methane spectra indicates that sub-ppm detection of methane at atmospheric pressure is feasible.}},
author = {{Gustafsson, U and Sandsten, J and Svanberg, Sune}},
issn = {{0946-2171}},
language = {{eng}},
number = {{6}},
pages = {{853--857}},
publisher = {{Springer}},
series = {{Applied Physics B}},
title = {{Simultaneous detection of methane, oxygen and water vapour utilising near-infrared diode lasers in conjunction with difference-frequency generation}},
url = {{https://lup.lub.lu.se/search/files/2920611/2297244.pdf}},
doi = {{10.1007/s003400000431}},
volume = {{71}},
year = {{2000}},
}