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UV–Vis Spectroscopy of Conjugated Systems01:32

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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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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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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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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Monochrome Camera Conversion: Effect on Sensitivity for Multispectral Imaging (Ultraviolet, Visible, and Infrared).

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  • 1JMC Scientific Consulting Ltd., Egham TW20 8LL, UK.

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Summary

Standard cameras converted to monochrome capture ultraviolet (UV) and infrared (IR) light. This study measured spectral sensitivities of modified monochrome cameras compared to standard multispectral conversions, focusing on UV-IR performance.

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Area of Science:

  • Optics and Photonics
  • Imaging Science

Background:

  • Standard digital cameras use a Color Filter Array (CFA) to capture color information.
  • Modifying cameras to capture ultraviolet (UV) and infrared (IR) spectra has diverse applications.
  • Removing the CFA creates monochrome cameras, altering spectral response.

Purpose of the Study:

  • To measure and compare the spectral sensitivities of monochrome cameras converted from standard cameras.
  • To evaluate the UV and IR performance of these modified monochrome cameras.
  • To compare their performance against standard multispectral camera conversions.

Main Methods:

  • Conversion of various standard cameras to monochrome by removing the CFA.
  • Measurement of spectral sensitivities across a wide range, from UV to IR.
  • Comparative analysis of sensitivity data between modified monochrome and standard multispectral cameras.

Main Results:

  • Monochrome conversion significantly alters spectral sensitivity compared to standard cameras.
  • Modified cameras demonstrate measurable sensitivity in UV and IR regions.
  • Performance variations observed across different sensor types in monochrome configurations.

Conclusions:

  • Monochrome camera conversion is a viable method for extending spectral imaging into UV and IR.
  • Understanding spectral sensitivity is crucial for applications utilizing modified cameras.
  • Further research can optimize monochrome conversions for specific UV-IR imaging tasks.