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Proceedings Paper

Design of a MEMS-based retina scanning system for biometric authentication
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Paper Abstract

There is an increasing need for reliable authentication for a number of applications such as e commerce. Common authentication methods based on ownership (ID card) or knowledge factors (password, PIN) are often prone to manipulations and may therefore be not safe enough. Various inherence factor based methods like fingerprint, retinal pattern or voice identifications are considered more secure. Retina scanning in particular offers both low false rejection rate (FRR) and low false acceptance rate (FAR) with about one in a million. Images of the retina with its characteristic pattern of blood vessels can be made with either a fundus camera or laser scanning methods. The present work describes the optical design of a new compact retina laser scanner which is based on MEMS (Micro Electric Mechanical System) technology. The use of a dual axis micro scanning mirror for laser beam deflection enables a more compact and robust design compared to classical systems. The scanner exhibits a full field of view of 10° which corresponds to an area of 4 mm2 on the retinal surface surrounding the optical disc. The system works in the near infrared and is designed for use under ambient light conditions, which implies a pupil diameter of 1.5 mm. Furthermore it features a long eye relief of 30 mm so that it can be conveniently used by persons wearing glasses. The optical design requirements and the optical performance are discussed in terms of spot diagrams and ray fan plots.

Paper Details

Date Published: 2 May 2014
PDF: 10 pages
Proc. SPIE 9130, Micro-Optics 2014, 91300G (2 May 2014); doi: 10.1117/12.2051425
Show Author Affiliations
Franziska Woittennek, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Jens Knobbe, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Tino Pügner, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Uwe Schelinski, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)
Heinrich Grüger, Fraunhofer-Institut für Photonische Mikrosysteme (Germany)

Published in SPIE Proceedings Vol. 9130:
Micro-Optics 2014
Hugo Thienpont; Jürgen Mohr; Hans Zappe; Hirochika Nakajima, Editor(s)

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