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Related Concept Videos

Scaling01:26

Scaling

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In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Multilateral spectral radiance factor scale comparison.

C Strothkämper, A Ferrero, A Koo

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    |March 2, 2017
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    Summary
    This summary is machine-generated.

    This study compared spectral radiance factor (SRF) measurements across six national metrology institutes (NMIs) using ceramic samples. Results show good agreement in most spectral ranges, but highlight the need for improved uncertainty evaluations by NMIs.

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    Area of Science:

    • Metrology
    • Optical Engineering
    • Materials Science

    Background:

    • Spectral radiance factor (SRF) measurements are increasingly important.
    • Previous scale conformity was limited to two national metrology institutes (NMIs).
    • A multilateral comparison is needed to establish broader scale conformity.

    Purpose of the Study:

    • To conduct a multilateral scale comparison of goniospectrophotometers.
    • To assess scale conformity among six NMIs and two universities.
    • To evaluate SRF measurements across the visible spectrum (380-780 nm).

    Main Methods:

    • Utilized neutral and colored diffusely reflecting ceramic samples.
    • Included six NMIs, two universities with a home-built gonioreflectometer, and commercial instruments.
    • Covered the visible wavelength range from 380 nm to 780 nm.

    Main Results:

    • Identified systematic issues in SRF measurements.
    • Indicated that uncertainty evaluations by NMIs require further refinement.
    • Found good agreement across most of the spectral range studied.

    Conclusions:

    • Multilateral comparison revealed areas for improvement in NMI SRF measurements.
    • Further work is necessary for robust uncertainty evaluation in spectral radiance factor measurements.
    • The study provides a foundation for enhanced international collaboration in optical metrology.