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Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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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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Using spectral information in forensic imaging.

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  • 1Department of Chemistry, Forensic Science Programme, The University of Auckland, Private Bag 92019, Auckland, New Zealand. g.miskelly@auckland.ac.nz

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Forensic evidence detection is enhanced by using specialized reagents with narrow spectral features. This method improves visibility of latent prints and soil traces using digital imaging and computer analysis.

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Digital Imaging

Background:

  • Traditional forensic visualization agents often lack distinct spectral features, hindering detection.
  • Distinguishing target substances from substrates is challenging with conventional methods.

Purpose of the Study:

  • To demonstrate improved detection of forensic evidence using reagents with narrow spectral features.
  • To showcase the application of digital imaging and computer enhancement for forensic analysis.

Main Methods:

  • Utilizing reagents with narrow absorption or emission bands for enhanced spectral contrast.
  • Employing digital cameras and computer image enhancement for background correction at specific wavelengths.
  • Applying advanced algorithms like principal component analysis for improved detection.

Main Results:

  • Successfully visualized latent fingermarks on paper using the zinc complex of Ruhemann's Purple.
  • Detected cyanoacrylate-fumed fingerprints with Europium(III) thenoyltrifluoroacetonate-phenanthroline complex (Eu(tta)(3)(phen)).
  • Visualized soil prints with 2,6-bis(benzimidazol-2-yl)-4-[4'-(dimethylamino)phenyl]pyridine (BBIDMAPP).

Conclusions:

  • Reagents with narrow spectral features significantly enhance the visibility of forensic evidence.
  • Digital imaging combined with spectral analysis offers a powerful tool for forensic trace detection.
  • This approach improves upon traditional methods, even with less intensely colored reagents.