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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

177
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
An analytical balance measures mass and requires regular calibration to...
177
Flame Photometry: Overview01:02

Flame Photometry: Overview

550
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...
550

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Uncertainty budget for detector-based absolute radiometric calibration with GLAMR.

Zhipeng Wang, Julia Barsi, Kurtis Thome

    Applied Optics
    |June 10, 2024
    PubMed
    Summary

    A new detector-based method using the Goddard Laser for Absolute Measurement of Radiance (GLAMR) system significantly improves absolute radiometric calibration (RadCal) accuracy for remote sensing instruments. This advancement is crucial for climate studies, achieving better than 0.6% uncertainty.

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    Area of Science:

    • Remote Sensing
    • Metrology
    • Optical Engineering

    Background:

    • Accurate absolute radiometric calibration (RadCal) is vital for remote sensing applications, with traditional methods having uncertainties of 2% or higher.
    • Climate studies require higher accuracy than currently achievable with traditional RadCal techniques.
    • Detector-based calibration offers a path to improved accuracy.

    Purpose of the Study:

    • To present a comprehensive uncertainty analysis of detector-based absolute RadCal using the GLAMR system.
    • To identify and quantify uncertainty sources in the GLAMR RadCal process.
    • To demonstrate the potential for improved calibration accuracy for remote sensing instruments.

    Main Methods:

    • Utilized the Goddard Laser for Absolute Measurement of Radiance (GLAMR) system for detector-based calibration.
    • Employed transfer radiometers calibrated at NIST as standards for traceable measurements.
    • Measured the absolute spectral response function of remote sensing instruments.
    • Conducted a detailed uncertainty analysis, examining sources from the GLAMR system, test configuration, and data processing.

    Main Results:

    • Achieved calibration uncertainty better than 0.3% (k=1) for 350-950 nm and 0.6% (k=1) for 950-2300 nm (excluding water absorption regions).
    • Quantified the contribution of various uncertainty sources, highlighting the most influential factors.
    • Demonstrated traceability to the International System of Units.

    Conclusions:

    • The GLAMR system enables highly accurate absolute radiometric calibration for remote sensing instruments.
    • The detector-based approach significantly reduces uncertainty compared to traditional methods.
    • Further refinements to the calibration process can lead to even greater accuracy.