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Imaging electrostatic fingerprints with implications for a forensic timeline.

Philip Watson¹, Robert J Prance, Sam T Beardsmore-Rust

¹Centre for Physical Electronics and Quantum Technology, School of Engineering and Design, University of Sussex, Falmer, Brighton, United Kingdom.

Forensic Science International

|April 23, 2011

Summary

This summary is machine-generated.

This study demonstrates an electric field microscopy system capable of imaging surface charge from fingerprints. The technology offers high spatial resolution for identification and uses charge decay for fingerprint dating.

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Area of Science:

Forensic Science
Physics
Materials Science

Background:

Contact electrification generates electrical charge on insulating surfaces from finger contact.
Analyzing this surface charge offers potential for forensic applications.

Purpose of the Study:

To image electrical charge deposited by finger contact using electric field microscopy.
To assess the potential for fingerprint identification and dating based on charge decay.

Main Methods:

Utilized an ultrahigh impedance electric potential sensor as a non-contact raster scanning probe.
Achieved a spatial resolution of up to 5 μm for surface charge density measurement.

Main Results:

Demonstrated sufficient spatial resolution for fingerprint identification.
Indicated that surface charge decay is a viable method for fingerprint dating or sequencing.
Observed that charge decay is well-defined, material-dependent, and can persist for days.

Conclusions:

The electric field microscopy system provides high-resolution imaging of fingerprint-induced surface charge.
Charge decay analysis presents a novel, non-destructive method for forensic fingerprint analysis, complementing existing techniques.