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Time-reversal ultrasonic for biometrical applications

Objective

The TUBA project aims at an assessment of a recently discovered phenomenon called Time-Reversed Mirroring (TRM) of acoustic waves for biometric authentication. The effect is based on the material inherent reflectance of a point-like ultrasonic source. It has been observed that the environment outside the material, in particular, can influence the reflectance by touching of the probe by a person. In case such an influence by a person (through a specific mean to be defined) would lead to a reproducible, characteristic measurement pattern, the effect could be used as a new approach of biometrical identification. The TUBA project aims at an assessment of a recently discovered phenomenon called Time-Reversed Mirroring (TRM) of acoustic waves for biometric authentication. The effect is based on the material inherent reflectance of a point-like ultrasonic source. It has been observed that the environment outside the material, in particular, can influence the reflectance by touching of the probe by a person. In case such an influence by a person (through a specific mean to be defined) would lead to a reproducible, characteristic measurement pattern, the effect could be used as a new approach of biometrical identification.

OBJECTIVES
The TUBA project aims at an assessment of a recently discovered phenomenon called Time-Reversed Mirroring (TRM) of acoustic waves as a new biometric mean. According to the theoretical framework of TRM and its experimental proof it is possible to generate the time-reversed counterpart of an acoustic wave inside a solid body and to re-emit it towards the original source of the wave. A crucial observation was that the wave propagation inside the solid body might be influenced by the environmental conditions of the solid body. In particular, a human finger put on the surface of such a solid body results in a specific variation of the reflectance pattern. This observation has led to the idea of using the specific variation as a new biometric authentication mean.

The TUBA project intends to explore the feasibility of this technique using small sized silicon plates ("chip-like") with inherent piezoelectric transducers for the following applications:
- Identification/Authentication of persons;
- Identification the aliveness of a probe. The main result of the project shall be a roadmap for further R&D based on a successful assessment of the basic principle.

DESCRIPTION OF WORK
The work is separated into three phases:
1. Experimental Framework Targeting Biometric Usability: The theoretical and experimental work in this project shall examine the general usability of the TRM rationale for biometric identification purposes. Thus, an experimentation plan (Deliverable D1) will be developed according to the targeted biometric application scenario, which enables the consortium to answer the three most crucial questions (WP2). This experimentation plan includes proposed designs for the experimentation scenario (e.g. geometry of solid body and transducers, nature and frequency of signals). The experimentation plan forms milestone 1;
2. Experiments for Biometric Usability: According to the experimentation plan, experiments will be performed in order to recognise and distinguish between various objects put on the surface of the solid body cavity (WP3). The result is the experimentation documentation (Deliverable D3 at milestone 2), which should give the answers to the questions addressed in this project;
3. Research Roadmap: Development of a research roadmap for further investigations towards a technical and economical exploitation of the TRM rationale (WP4). This roadmap shall be given even in the case that some of the targets could not be met in order to propose additional research, which eventually might lead to better results.

Funding Scheme

ACM - Preparatory, accompanying and support measures

Coordinator

UNIVERSITAET KARLSRUHE (TH)
Address
Kaiserstrasse 12
76131 Karlsruhe
Germany

Participants (1)

INSTITUT POUR LE DEVELOPPEMENT DE LA SCIENCE, L'EDUCATION ET LA TECHNOLOGIE
France
Address
Rue Vauquelin 10
75005 Paris