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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–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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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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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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High resolution ultraviolet imaging spectrometer for latent image analysis.

Hang Lyu, Ningfang Liao, Hongsong Li

    Optics Express
    |May 4, 2016
    PubMed
    Summary

    We developed a novel ultraviolet imaging spectrometer using an all-reflective design to overcome chromatic aberration. This high-resolution instrument effectively identifies latent traces in forensic imaging applications.

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    Area of Science:

    • Optics and Photonics
    • Forensic Science
    • Spectroscopy

    Background:

    • Chromatic aberration in transmissive optics limits ultraviolet (UV) imaging quality.
    • High spatial and spectral resolution are crucial for detailed analysis in forensic applications.

    Purpose of the Study:

    • To present a close-range ultraviolet imaging spectrometer with enhanced image quality.
    • To demonstrate its capability in forensic imaging for latent trace identification.

    Main Methods:

    • An all-reflective imaging scheme was employed, incorporating an oscillating mirror, Cassegrain objective, Michelson structure, Offner relay, and UV-enhanced CCD.
    • Interferogram and spectrum datacubes were generated and analyzed using pattern recognition algorithms.
    • Spectral calibration was performed using a high-pressure mercury discharge lamp.

    Main Results:

    • The spectrometer achieved a spatial resolution of 29.30μm.
    • It covers the near and middle UV bands (240-370nm) with approximately 100 wavelength samples.
    • The system successfully distinguished latent traces from base materials in test runs.

    Conclusions:

    • The all-reflective ultraviolet imaging spectrometer offers high spatial and spectral resolution for detailed analysis.
    • This instrument is particularly effective for identifying latent traces in forensic imaging.
    • The developed pattern recognition algorithms enhance the analysis of spectral datacubes for forensic applications.