New tricks for an old dog: Fingerprint detection and inkjet-trace imaging using disulfur dinitride
✍ Scribed by R.S.P. King
- Book ID
- 104092202
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 64 KB
- Volume
- 50
- Category
- Article
- ISSN
- 1355-0306
No coin nor oath required. For personal study only.
✦ Synopsis
the fingerprint components. MALDI Mass Spectrometry Imaging has been selected for its established potential in both compound identification and distribution. With this technique a UV absorbing laser is fired automatically on each position of a raster defined for the fingerprint and every time a mass spectrum is acquired. A data set consisting of an ordered array of mass spectra is created, where each spectrum represents the local molecular composition at known x,y coordinates. Ultimately, an image can be generated for each of the mass signals detected throughout the fingerprint. The intensity of the ion at each point of the analysed fingerprint will provide the colour intensity in the image. Raman spectroscopy has also been used increasingly for applications in forensic science because of its potential as a non-destructive, fast and portable technique. In this technique a laser source is used to cause a change in the vibrational and rotational energies of the molecules in the sample. These changes are characteristic of the molecule and are recorded as a shift from the laser energy accompanied by an intensity. As a latent fingerprint is constituted of lipids in the order of 2%, we have examined the distribution of a selection of lipids and the degradation produced in the fingerprint. Both 'real' and groomed fingerprints from 10 male individuals have been analysed in parallel through the abovementioned techniques monitoring lipid distribution and degradation over time and under a range of conditions, which will contribute in particular to the study of fingerprint-ageing by statistically linking lipids and their degradation products' images to age.