Low-volume, fast response-time hollow silica waveguide gas cells for mid-IR spectroscopy

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dc.contributor.author Francis, Daniel
dc.contributor.author Hodgkinson, Jane
dc.contributor.author Livingstone, B.
dc.contributor.author Black, Paul
dc.contributor.author Tatam, Ralph P.
dc.date.accessioned 2016-09-02T14:55:31Z
dc.date.available 2016-09-02T14:55:31Z
dc.date.issued 2016-08-22
dc.identifier.citation Francis, D. et al. (2016) Low-volume, fast response-time hollow silica waveguide gas cells for mid-IR spectroscopy, Applied Optics, Volume 55, Issue 25, pp. 6797-6806 en_UK
dc.identifier.issn 1559-128X
dc.identifier.uri http://dx.doi.org/10.1364/AO.55.006797
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/10490
dc.description.abstract Hollow silica waveguides (HSWs) are used to produce long path length, low-volume gas cells, and are demonstrated with quantum cascade laser spectroscopy. Absorption measurements are made using the intrapulse technique, which allows measurements to be made across a single laser pulse. Simultaneous laser light and gas coupling is achieved through the modification of commercially available gas fittings with low dead volume. Three HSW gas cell configurations with different path lengths and internal diameters are analyzed and compared with a 30 m path length astigmatic Herriott cell. Limit of detection measurements are made for the gas cells using methane at a wavelength 7.82 μm. The lowest limit of detection was provided by HSW with a bore diameter of 1000 μm and a path length of 5 m and was measured to be 0.26 ppm, with a noise equivalent absorbance of 4.1×10 −4 . The long-term stability of the HSW and Herriott cells is compared through analysis of the Allan–Werle variance of data collected over a 24 h period. The response times of the HSW and Herriott cells are measured to be 0.8 s and 36 s, respectively. en_UK
dc.language.iso en en_UK
dc.publisher Optical Society of America en_UK
dc.rights Attribution 4.0 International
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.title Low-volume, fast response-time hollow silica waveguide gas cells for mid-IR spectroscopy en_UK
dc.type Article en_UK


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