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Related Concept Videos

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
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Calibration of Reflectance Standards.

W Budde1

  • 1National Research Council of Canada, Ottawa, Canada K1A OR6.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|March 21, 2020
PubMed
Summary
This summary is machine-generated.

Accurate diffuse spectral reflectance measurements rely on calibrated standards. This study compares various calibration methods, including goniophotometric and integrating sphere techniques, to assess their suitability for transfer and working standards.

Keywords:
Barium sulfatediffuse reflectance spectramagnesium oxideopal glassradiant fluxreflectance standardsstandards calibration

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Area of Science:

  • Optical Physics
  • Metrology

Background:

  • Diffuse spectral reflectance measurements are crucial in various scientific fields.
  • Direct flux measurements are challenging; relative measurements using standards are preferred.
  • Calibration of reflectance standards is essential for accurate data.

Purpose of the Study:

  • To review and compare different methods for calibrating diffuse spectral reflectance standards.
  • To evaluate the suitability of various materials (e.g., MgO, BaSO4, opal glass) as standards.
  • To present comparative measurement results between different calibration techniques.

Main Methods:

  • Goniophotometric (Indicatrix/point-by-point) methods.
  • Methods based on the Kubelka-Munk theory.
  • Integrating sphere methods (Taylor, Benford, Sharp-Little, van den Akker, Korte).

Main Results:

  • Discussion on the suitability of different materials as transfer or working standards.
  • Presentation of comparative measurement results obtained from various methods.
  • Insights into the performance and applicability of each calibration technique.

Conclusions:

  • The choice of calibration method impacts the accuracy and reliability of reflectance standards.
  • Different materials exhibit varying suitability for use as transfer or working standards.
  • Comparative analysis provides guidance for selecting appropriate calibration procedures.