Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes.
Cavity enhanced absorption measurements have been made of several species that absorb light between 1.5 and 1.7 µm using both a supercontinuum source and superluminescent light emitting diodes. A system based upon an optical enhancement cavity of relatively high finesse, consisting of mirrors of ref...
| Huvudupphovsmän: | , , , , , , |
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| Materialtyp: | Journal article |
| Språk: | English |
| Publicerad: |
2011
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| _version_ | 1826267295699173376 |
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| author | Denzer, W Hancock, G Islam, M Langley, C Peverall, R Ritchie, G Taylor, D |
| author_facet | Denzer, W Hancock, G Islam, M Langley, C Peverall, R Ritchie, G Taylor, D |
| author_sort | Denzer, W |
| collection | OXFORD |
| description | Cavity enhanced absorption measurements have been made of several species that absorb light between 1.5 and 1.7 µm using both a supercontinuum source and superluminescent light emitting diodes. A system based upon an optical enhancement cavity of relatively high finesse, consisting of mirrors of reflectivity ∼99.98%, and a Fourier transform spectrometer, is demonstrated. Spectra are recorded of isoprene, butadiene, acetone and methane, highlighting problems with spectral interference and unambiguous concentration determinations. Initial results are presented of acetone within a breath-like matrix indicating ppm precision at <∼10 ppm acetone levels. Instrument sensitivities are sufficiently enhanced to enable the detection of atmospheric levels of methane. Higher detection sensitivities are achieved using the supercontinuum source, with a minimum detectable absorption coefficient of ∼4 × 10(-9) cm(-1) reported within a 4 min acquisition time. Finally, two superluminescent light emitting diodes are coupled together to increase the wavelength coverage, and measurements are made simultaneously on acetylene, CO(2), and butadiene. The absorption cross-sections for acetone and isoprene have been measured with an instrumental resolution of 4 cm(-1) and are found to be 1.3 ± 0.1 × 10(-21) cm(2) at a wavelength of 1671.9 nm and 3.6 ± 0.2 × 10(-21) cm(2) at 1624.7 nm, respectively. |
| first_indexed | 2024-03-06T20:51:59Z |
| format | Journal article |
| id | oxford-uuid:37e81104-7bba-4d6e-b842-d9115cb7fd6c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:51:59Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:37e81104-7bba-4d6e-b842-d9115cb7fd6c2022-03-26T13:46:46ZTrace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:37e81104-7bba-4d6e-b842-d9115cb7fd6cEnglishSymplectic Elements at Oxford2011Denzer, WHancock, GIslam, MLangley, CPeverall, RRitchie, GTaylor, DCavity enhanced absorption measurements have been made of several species that absorb light between 1.5 and 1.7 µm using both a supercontinuum source and superluminescent light emitting diodes. A system based upon an optical enhancement cavity of relatively high finesse, consisting of mirrors of reflectivity ∼99.98%, and a Fourier transform spectrometer, is demonstrated. Spectra are recorded of isoprene, butadiene, acetone and methane, highlighting problems with spectral interference and unambiguous concentration determinations. Initial results are presented of acetone within a breath-like matrix indicating ppm precision at <∼10 ppm acetone levels. Instrument sensitivities are sufficiently enhanced to enable the detection of atmospheric levels of methane. Higher detection sensitivities are achieved using the supercontinuum source, with a minimum detectable absorption coefficient of ∼4 × 10(-9) cm(-1) reported within a 4 min acquisition time. Finally, two superluminescent light emitting diodes are coupled together to increase the wavelength coverage, and measurements are made simultaneously on acetylene, CO(2), and butadiene. The absorption cross-sections for acetone and isoprene have been measured with an instrumental resolution of 4 cm(-1) and are found to be 1.3 ± 0.1 × 10(-21) cm(2) at a wavelength of 1671.9 nm and 3.6 ± 0.2 × 10(-21) cm(2) at 1624.7 nm, respectively. |
| spellingShingle | Denzer, W Hancock, G Islam, M Langley, C Peverall, R Ritchie, G Taylor, D Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title | Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title_full | Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title_fullStr | Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title_full_unstemmed | Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title_short | Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes. |
| title_sort | trace species detection in the near infrared using fourier transform broadband cavity enhanced absorption spectroscopy initial studies on potential breath analytes |
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