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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

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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...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Vis Spectrum01:30

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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.     
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Measurement system for ultraviolet channel modeling and communications.

C Hakan Arslan, Fikadu T Dagefu, Terrence J Moore

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    This study introduces an experimental system for ultraviolet (UV) communication, enabling non-line-of-sight networking. The system validates UV channel models and optimizes communication links through precise measurements.

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    Area of Science:

    • Optical Communications
    • Wireless Networking
    • Atmospheric Physics

    Background:

    • Growing interest in ultraviolet (UV) communication for non-line-of-sight (NLOS) networking.
    • Limited experimental validation of theoretical and simulation-based UV channel models.

    Purpose of the Study:

    • To present a flexible experimental system for precise UV channel and communication measurements.
    • To validate analytical models through experimental research.
    • To demonstrate the system's utility in UV communication link optimization.

    Main Methods:

    • Development of a transceiver system with a gimbal, UV light-emitting-diode (LED) array, and photomultiplier tube detector.
    • Implementation of node synchronization and LabVIEW-based data acquisition.
    • Novel techniques for characterizing UV LED radiation patterns, transmit power, and detector field of view.

    Main Results:

    • Successful demonstration of precise UV channel and communication measurements.
    • Experimental validation of UV channel models showing good agreement with theory and simulations.
    • Demonstration of steering optimization for UV communication links.

    Conclusions:

    • The developed experimental system provides a robust platform for UV communication research.
    • Experimental validation confirms the accuracy of theoretical and simulation models for UV channels.
    • The system facilitates advancements in NLOS UV communication technologies.