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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

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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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Data Validation

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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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Linearization of the Bradford Protein Assay
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Measurement Assurance Program Transmittance Standards for Spectrophotometric Linearity Testing: Preparation and

Kenneth L Eckerle1, Victor R Weidner1, Jack J Hsia1

  • 1National Bureau of Standards, Washington, DC 20234.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary

Neutral density glass filters were prepared and calibrated for spectrophotometry to ensure photometric linearity. These filters aid laboratories in accurate spectral transmittance measurements, crucial for calibration assurance.

Keywords:
experimental designfilter uniformitylinearity testingmeasurement assurance programneutral density glasspassband effectspolarization effectspolynomial fittingspectrophotometrystatisticstransmittance standards

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Area of Science:

  • Metrology
  • Optical Physics
  • Analytical Chemistry

Background:

  • Spectrophotometric calibrations require reliable methods for assessing photometric linearity.
  • Neutral density filters are essential tools for checking spectrophotometer performance.

Purpose of the Study:

  • To establish a Measurement Assurance Program for spectrophotometry.
  • To prepare and calibrate neutral density glass filters for linearity checks in spectral transmittance measurements.

Main Methods:

  • Preparation of neutral density glass filters with nominal transmittances from 92% to 0.1% at 548.5 nm.
  • Calibration of filters using the NBS Reference Spectrophotometer with a 1.5 nm passband collimated beam.
  • Analysis of spectral transmittance data, including uniformity, polarization effects, and passband variations (1.5 nm to 10.5 nm).

Main Results:

  • Filters were prepared in three standard sizes for broad applicability.
  • High-accuracy spectral transmittance measurements were performed.
  • Statistical analysis quantified the impact of different passbands on transmittance data.

Conclusions:

  • The developed neutral density filters are suitable for verifying photometric linearity in spectrophotometry.
  • The calibration data provides a reliable basis for spectrophotometric assurance programs.
  • Understanding passband effects is critical for accurate transmittance measurements.