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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Location of Latent Forensic Traces Using Multispectral Bands.

Samuel Miralles-Mosquera1, Bernardo Alarcos2, Alfredo Gardel2

  • 1Police-Specialist of Forensic Image of General Headquarters of Forensics Police, National Police, c/Julián González Segador s/n, 28043 Madrid, Spain.

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|December 11, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a modified digital SLR camera for multispectral imaging, enabling forensic experts to detect hidden evidence like bloodstains and tattoos at crime scenes using specific filters and lighting. This non-invasive optical method enhances forensic trace detection.

Keywords:
bloodforensic scienceinfraredlatent tracesmultispectralphotographyultraviolet

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Area of Science:

  • Forensic Science
  • Optical Imaging
  • Digital Forensics

Background:

  • Commercial multispectral capture devices are expensive and not field-ready for crime scene investigations.
  • Existing forensic techniques may not reveal all latent evidence effectively.

Purpose of the Study:

  • To develop and validate a cost-effective, field-adaptable multispectral imaging system for forensic trace detection.
  • To demonstrate the capability of a modified digital SLR camera in revealing latent forensic evidence invisible to the naked eye.

Main Methods:

  • Modification of a digital SLR camera for capturing images beyond the visible spectrum.
  • Strategic use of wavelength filters, capturing angles, and illumination sources.
  • Application of the system in real-world forensic scenarios, including bloodstains, tattoos, and device patterns.

Main Results:

  • Successful detection of latent forensic traces, including bloodstains, hidden/erased tattoos, and unlocking patterns on mobile devices.
  • Demonstration of the system's validity across diverse forensic case types.
  • Validation of the non-invasive optical procedure for latent evidence location.

Conclusions:

  • A modified digital SLR camera offers a viable, non-invasive solution for forensic multispectral imaging.
  • The developed procedure enhances the capabilities of forensic units in locating latent evidence at crime scenes.
  • Multispectral inspection presents a promising avenue for operational forensic units.