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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
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Updated: Jun 16, 2026

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Published on: December 14, 2017

Vacuum ultraviolet absolute radiometry utilizing total blackbody radiation.

G Marette

    Applied Optics
    |February 19, 2010
    PubMed
    Summary

    A novel calibration technique establishes secondary standards for vacuum ultraviolet measurements. This method uses a monochromator and blackbody simulator, achieving an overall uncertainty below 20% for ultraviolet flux.

    Area of Science:

    • Physics
    • Spectroscopy
    • Metrology

    Background:

    • Accurate calibration is crucial for reliable measurements in the vacuum ultraviolet (VUV) spectral range.
    • Existing calibration methods may have limitations in terms of accuracy or accessibility.
    • Establishing secondary standards is essential for disseminating accurate radiometric scales.

    Purpose of the Study:

    • To develop a new calibration technique for the vacuum ultraviolet spectral range.
    • To enable the establishment of secondary standards for monochromatic sources and detectors.
    • To provide a reliable method for VUV flux calibration.

    Main Methods:

    • A calibration technique comparing ultraviolet flux from a monochromator against a blackbody simulator.
    • Utilizing a thermopile as a reference detector for the comparison.

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    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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  • Operating within the vacuum ultraviolet spectral range.

    • Main Results:

    • A new calibration technique for VUV measurements has been successfully developed.
    • Monochromatic sources and detectors can be established as secondary standards.
    • The method achieves an overall uncertainty not exceeding 20%.

    Conclusions:

    • The described technique offers a viable method for calibrating VUV instrumentation.
    • Secondary standards can be realized using this comparison-based approach.
    • The achieved uncertainty level is suitable for many VUV applications.