Uncertainty budgets for liquid waveguide CDOM absorption measurements

Lefering, Ina and Röttgers, Rüdiger and Utschig, Christian and McKee, David (2017) Uncertainty budgets for liquid waveguide CDOM absorption measurements. Applied Optics, 56 (22). pp. 6357-6366. ISSN 1559-128X (https://doi.org/10.1364/AO.56.006357)

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Abstract

Long path length liquid waveguide capillary cell (LWCC) systems using simple spectrometers to determine the spectral absorption by colored dissolved organic matter (CDOM) have previously been shown to have better measurement sensitivity compared to high-end spectrophotometers using 10 cm cuvettes. Information on the magnitude of measurement uncertainties for LWCC systems, however, has remained scarce. Cross-comparison of three different LWCC systems with three different path lengths (50, 100, and 250 cm) and two different cladding materials enabled quantification of measurement precision and accuracy, revealing strong wavelength dependency in both parameters. Stable pumping of the sample through the capillary cell was found to improve measurement precision over measurements made with the sample kept stationary. Results from the 50 and 100 cm LWCC systems, with higher refractive index cladding, showed systematic artifacts including small but unphysical negative offsets and high-frequency spectral perturbations due to limited performance of the salinity correction. In comparison, the newer 250 cm LWCC with lower refractive index cladding returned small positive offsets that may be physically correct. After null correction of measurements at 700 nm, overall agreement of CDOM absorption data at 440 nm was found to be within 5% root mean square percentage error.

ORCID iDs

Lefering, Ina ORCID logoORCID: https://orcid.org/0000-0003-1167-2227, Röttgers, Rüdiger, Utschig, Christian and McKee, David ORCID logoORCID: https://orcid.org/0000-0001-8023-5923;
  • Item type:Article
    ID code:61593
    Dates:
    Date
    Event
    1 August 2017
    Published
    31 July 2017
    Published Online
    28 June 2017
    Accepted
    Notes:© 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:17 Aug 2017 11:53
    Last modified:11 Nov 2024 11:46
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/61593
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