Detection of Fingerprint using He-Ne and Diode Lasers on Aluminium and Glass Surfaces

Ali Abdelrhman Saeed Marouf,Malka Aldar Daood Abdalrheim Daood

doi:10.11648/j.rst.20190504.11

Abstract

There are different latent fingerprint recovering techniques, physical and chemical techniques are available for the development of latent fingerprints. Fingerprints detection requires high sensitivity, which is provided by luminescence and appropriate physical and chemical treatments. Photoluminescence detection of latent fingerprints has over the last quarter-century brought about a new level of fingerprint detection sensitivity. Fingerprints have many uses, a chemical solution usually used to detect fingerprints but it takes time. In this paper, we were operating with low-power lasers, He-Ne laser with output power 1mmW and wavelength 632.8nm and diode laser with output power 5mmW and wavelength 532nm to detect fingerprints on an aluminium and glass surfaces. Fingerprints were exposed by the laser beam through a convex lens with focal length 5mm then a digital camera was used to record luminescence from fingerprint. The revealed results show clear images for the fingerprints using two types of lasers He-Ne and diode and appearing its characteristics on different surfaces obviously. Using laser sources to detect fingerprints is a simple method using low-level lasers without chemicals, in a short period of time, with low cost and gives good results.

Highlights

Significant advances in laser technology and the development of novel light detectors have dramatically improved spectroscopic methods for molecular characterization over the last decade
We have studied visible fluorescence spectra of fingerprints excited with 532 nm and 632 nm illumination in detail with our new imaging system
Diode laser pointer with an output power of 5mW used to expose on aluminium knife surface the showing fingerprint with six different following patterns: 1. Island

Summary

Introduction

Significant advances in laser technology and the development of novel light detectors have dramatically improved spectroscopic methods for molecular characterization over the last decade. The light sources used to generate narrow bandwidths come in several different varieties, including UV lamps, filtered lamps, and lasers. Each of these light sources has advantages and disadvantages, depending on the intended purpose and one’s budget. In 2009, Alaoui used Argon laser with the blue lines 476.5 and 488 nm to excited the prints to be detected and observed the sample’s fluorescence is under orange filters. He compared between photoluminescence fingerprints and trace explosives detection. We have studied visible fluorescence spectra of fingerprints excited with 532 nm and 632 nm illumination in detail with our new imaging system

Detection of Fingerprint on Aluminium Surface

Materials and Methods

Detection of Fingerprint on Glass Surface

Conclusions