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Related Concept Videos

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...
Instrument Calibration01:12

Instrument Calibration

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...
UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
UV–Vis Spectrum01:30

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
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UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media

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Field calibration unit for ultraviolet spectroradiometers.

E A Early, E A Thompson, P Disterhoft

    Applied Optics
    |February 28, 2008
    PubMed
    Summary

    New field calibration equipment ensures accurate solar ultraviolet irradiance measurements. This system, using horizontal standard lamps, is suitable for routine spectroradiometer calibrations in the field.

    Area of Science:

    • Atmospheric science
    • Radiometry
    • Spectroradiometry

    Background:

    • Accurate measurement of solar ultraviolet (UV) irradiance is crucial for environmental and health studies.
    • Spectroradiometers are key instruments for measuring UV irradiance, but require regular calibration.
    • Field calibrations are necessary to account for instrument drift and environmental conditions.

    Purpose of the Study:

    • To describe a novel field calibration unit and power supply for horizontal standard lamps.
    • To detail the operation and uncertainties associated with this field calibration system.
    • To assess the suitability of the system for routine calibration of spectroradiometers in the field.

    Main Methods:

    • Development of a specialized field calibration unit and power supply.

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    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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  • Utilization of horizontal standard lamps for spectral irradiance responsivity calibration.
  • Assessment of the system's performance at two independent field instrument intercomparisons.

    • Main Results:

    • The developed field calibration unit and power supply meet the requirements for field use.
    • Operation and uncertainty analyses confirm system reliability.
    • Instrument intercomparison results demonstrate that the system operates within design tolerances.

    Conclusions:

    • The horizontal standard lamp system, including the field calibration unit and power supply, is suitable for routine field calibrations.
    • This system enhances the accuracy and reliability of spectroradiometer measurements of solar UV irradiance.
    • The technology facilitates consistent and dependable UV irradiance data collection globally.