A reference material with close to Lambertian reflectance and fluorescence emission profiles

Priit Jaanson, Tomi Pulli, Farshid Manoocheri, Erkki Ikonen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Fluorescent brightening agents are widely used in various industries to enhance the appearance of materials. The angular profiles of emission and reflectance of fluorescent surfaces have been shown to deviate from Lambertian behaviour, however, in industry and calibration facilities single geometry measurements are often used, which requires assumptions to be made on the angular distributions. In addition, the angular distribution of reflectance has been shown to deviate from that of fluorescence. In this work, it is shown that the angular distribution of reflectance is dependent on the excitation wavelength and the effect is explained by qualitative and quantitative models. These angular and spectral effects may cause measurement errors when single geometry bidirectional measurements are carried out. The angular distributions can be taken into account by using goniometrical measurements, which however, result in increased calibration time and cost. Alternatively, a reference material could be used where the angular dependencies are minimised. In this work, a novel material is presented which demonstrates more Lambertian emission and reflectance profiles than conventional polytetrafluoroethylene (PTFE) based materials and a smaller dependence of angular reflectance on the absorbance of the sample.
    Original languageEnglish
    Pages (from-to)1330-1338
    JournalMetrologia
    Volume53
    Issue number6
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Angular distribution
    Fluorescence
    Calibration
    Geometry
    Measurement errors
    Polytetrafluoroethylenes
    Industry
    Wavelength
    Costs

    Keywords

    • fluorescence
    • reference standard
    • Lambertian
    • angle resolved
    • goniometrical
    • radiance factor
    • bispectral luminescent radiance facto

    Cite this

    Jaanson, Priit ; Pulli, Tomi ; Manoocheri, Farshid ; Ikonen, Erkki. / A reference material with close to Lambertian reflectance and fluorescence emission profiles. In: Metrologia. 2016 ; Vol. 53, No. 6. pp. 1330-1338.
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    title = "A reference material with close to Lambertian reflectance and fluorescence emission profiles",
    abstract = "Fluorescent brightening agents are widely used in various industries to enhance the appearance of materials. The angular profiles of emission and reflectance of fluorescent surfaces have been shown to deviate from Lambertian behaviour, however, in industry and calibration facilities single geometry measurements are often used, which requires assumptions to be made on the angular distributions. In addition, the angular distribution of reflectance has been shown to deviate from that of fluorescence. In this work, it is shown that the angular distribution of reflectance is dependent on the excitation wavelength and the effect is explained by qualitative and quantitative models. These angular and spectral effects may cause measurement errors when single geometry bidirectional measurements are carried out. The angular distributions can be taken into account by using goniometrical measurements, which however, result in increased calibration time and cost. Alternatively, a reference material could be used where the angular dependencies are minimised. In this work, a novel material is presented which demonstrates more Lambertian emission and reflectance profiles than conventional polytetrafluoroethylene (PTFE) based materials and a smaller dependence of angular reflectance on the absorbance of the sample.",
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    A reference material with close to Lambertian reflectance and fluorescence emission profiles. / Jaanson, Priit; Pulli, Tomi; Manoocheri, Farshid; Ikonen, Erkki.

    In: Metrologia, Vol. 53, No. 6, 2016, p. 1330-1338.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - A reference material with close to Lambertian reflectance and fluorescence emission profiles

    AU - Jaanson, Priit

    AU - Pulli, Tomi

    AU - Manoocheri, Farshid

    AU - Ikonen, Erkki

    PY - 2016

    Y1 - 2016

    N2 - Fluorescent brightening agents are widely used in various industries to enhance the appearance of materials. The angular profiles of emission and reflectance of fluorescent surfaces have been shown to deviate from Lambertian behaviour, however, in industry and calibration facilities single geometry measurements are often used, which requires assumptions to be made on the angular distributions. In addition, the angular distribution of reflectance has been shown to deviate from that of fluorescence. In this work, it is shown that the angular distribution of reflectance is dependent on the excitation wavelength and the effect is explained by qualitative and quantitative models. These angular and spectral effects may cause measurement errors when single geometry bidirectional measurements are carried out. The angular distributions can be taken into account by using goniometrical measurements, which however, result in increased calibration time and cost. Alternatively, a reference material could be used where the angular dependencies are minimised. In this work, a novel material is presented which demonstrates more Lambertian emission and reflectance profiles than conventional polytetrafluoroethylene (PTFE) based materials and a smaller dependence of angular reflectance on the absorbance of the sample.

    AB - Fluorescent brightening agents are widely used in various industries to enhance the appearance of materials. The angular profiles of emission and reflectance of fluorescent surfaces have been shown to deviate from Lambertian behaviour, however, in industry and calibration facilities single geometry measurements are often used, which requires assumptions to be made on the angular distributions. In addition, the angular distribution of reflectance has been shown to deviate from that of fluorescence. In this work, it is shown that the angular distribution of reflectance is dependent on the excitation wavelength and the effect is explained by qualitative and quantitative models. These angular and spectral effects may cause measurement errors when single geometry bidirectional measurements are carried out. The angular distributions can be taken into account by using goniometrical measurements, which however, result in increased calibration time and cost. Alternatively, a reference material could be used where the angular dependencies are minimised. In this work, a novel material is presented which demonstrates more Lambertian emission and reflectance profiles than conventional polytetrafluoroethylene (PTFE) based materials and a smaller dependence of angular reflectance on the absorbance of the sample.

    KW - fluorescence

    KW - reference standard

    KW - Lambertian

    KW - angle resolved

    KW - goniometrical

    KW - radiance factor

    KW - bispectral luminescent radiance facto

    U2 - 10.1088/0026-1394/53/6/1330

    DO - 10.1088/0026-1394/53/6/1330

    M3 - Article

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    JO - Metrologia

    JF - Metrologia

    SN - 0026-1394

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