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Related Concept Videos

Glassware Calibration01:11

Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T10:22

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A protocol to study biological tissue at high spatial resolution using ultra-high field magnetic resonance microscopy (MRM) using microcoils is presented. Step-by-step instructions are provided for characterizing the microcoils. Finally, optimization of imaging is demonstrated on plant...
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Calibration Curves07:43

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Source: Laboratory of Dr. B. Jill Venton - University of Virginia
Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
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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.
Analytical Balance Calibration
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Plotting and Calibrating the Root Locus01:19

Plotting and Calibrating the Root Locus

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Root loci often diverge as system poles shift from the real axis to the complex plane. Key points in this transition are the breakaway and break-in points, indicating where the root locus leaves and reenters the real axis. The branches of the root locus form an angle of 180/n degrees with the real axis, where n is the number of branches at a breakaway or break-in point.
The maximum gain occurs at the breakaway points between open-loop poles on the real axis, while the minimum gain is...
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Calibration Curves: Correlation Coefficient01:10

Calibration Curves: Correlation Coefficient

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In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
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Related Experiment Video

Updated: Jan 19, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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SPEX airborne spectropolarimeter calibration and performance.

J Martijn Smit, Jeroen H H Rietjens, Gerard van Harten

    Applied Optics
    |September 11, 2019
    PubMed
    Summary

    SPEX airborne, a hyperspectral polarimeter, provides accurate measurements of aerosol polarization and radiance. This instrument is crucial for advancing our understanding of aerosols

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    Area of Science:

    • Atmospheric Science
    • Climate Science
    • Optical Physics

    Background:

    • Aerosols significantly impact climate and air quality.
    • Accurate aerosol characterization requires multiangle, multiwavelength polarimetric measurements.
    • Satellite-based instruments are essential for global aerosol monitoring.

    Purpose of the Study:

    • To develop and validate SPEX airborne, a hyperspectral polarimeter for aerosol characterization.
    • To assess the accuracy of SPEX airborne's degree of linear polarization (DoLP) and radiance measurements.
    • To demonstrate SPEX airborne's capability as a precursor to space-based SPEX instruments.

    Main Methods:

    • SPEX airborne utilizes spectral polarization modulation for DoLP measurements.
    • Radiometric and polarimetric calibration performed using Jet Propulsion Laboratory (JPL) facilities.
    • In-flight intercomparison with Research Scanning Polarimeter (RSP) during a field campaign.

    Main Results:

    • SPEX airborne achieved laboratory DoLP measurement accuracy of 0.002-0.004.
    • Radiometric calibration accuracy was estimated at 4%.
    • In-flight DoLP measurements showed root-mean-square (RMS) differences of 0.004-0.02 compared to RSP.
    • Radiance measurements exhibited excellent agreement with RSP (RMS difference of ~4%).

    Conclusions:

    • SPEX airborne successfully demonstrated high-accuracy polarimetric and radiometric measurements.
    • In-flight performance validated SPEX airborne's capability to deliver high-quality aerosol data.
    • The instrument serves as a vital demonstrator for future space-based aerosol monitoring missions.