CNRS Technologies

Find the best CNRS technologies to boost your innovative project.

Les brevets les plus récents

You are a research scientist?

We can guide you through the whole technology transfer process.

See all our services

You are a corporate player?

Thanks to our expertise, our network and our know-how of the innovation ecosystem, we support you throughout your project.

Contact us

Follow our news and upcoming events

Discover CNRS technologies

Meet our team

Fermer

Locating a signal source

Référence

01034-01

Statut des brevets

US patent and EP patent n°06291133.4 filed on July 7th, 2006 and entitled “Method and system for locating a source of particle, molecule, or fragment of molecule using their reception rate”

Inventeurs

Massimo VERGASSOLA
Boris SHRAIMAN
Emmanuel VILLERMAUX

Statut commercial

Exclusive or non-exclusive licenses and collaborative research

Laboratoire

Laboratoire Génétique in silico – CNRS URA 2171
http://www.pasteur.fr/recherche/RAR/RAR2006/Gins.html

Description

CONTEXT

Animals like insects or birds look for food and other animals by locating odorous sources. Semiconductor sensor detect substances and evaluate their concentration, however such task must take into account the environment like air flow which impact the diffusion characteristics. Chemotactic strategies are based on gradient of concentration measurement but mixing in a flowing medium breaks up regions of high concentration into random and disconnected patches and average concentration may decay rapidly with distance from the source. So a macroscopic searcher must devise a strategy of movement based on sporadic cues and partial information.

TECHNICAL DESCRIPTION

The present invention proposes a search algorithm, which we call ‘infotaxis’, designed to locate the source of a signal. The idea is that the rate of acquisition of information on source location, can play the same role as local concentration in bacterial chemotaxis; the expected local rate of information gain and the resulting trajectories feature zigzagging and casting paths similar to those observed in flights of moths and birds. When signal is an odour a lattice is designed in search space after having determined the diffusion parameters of the desired particles in said space. The sensor measures the presence/or absence of molecule and the system determines the probability of presence on each node of the space. Then the sensor moves to another node depending on the entropy of the computed probabilities.
Said particles may be biological molecules or proteins or dust or fragments thereof or pathogens. The method also applies to the localization of two or more sources of signal.
The general idea of infotaxis can be applied more broadly in the context of searching with sparse information and provides a framework for quantitative understanding of the balance between the competing exploration and exploitation behaviors in learning processes.

BENEFIT

  • Reduced time of search
  • Easy to implement on any robot type
  • Sensor independent  (gas or drug molecule…)
  • Adapted to fluid (gas or liquid) environment
  • Distance of localization much higher than with chemotaxis

INDUSTRIAL APPLICATIONS

  • Civilian security and defense : research of explosive, mines, drugs, chemical or gas leaks, fire detection …
  • Industrial security : chemical or gas leaks, fire detection …
  • Luggage inspection
DEVELOPMENT STAGE

Computer validation and test with robots have shown that the search time is reduced
Search on a 10 m scale is possible which chemotaxis does not allowed

For further information, please contact us (Ref 01034-01)


Besoin de plus d'informations ?

Nous contacter
Fermer

Contactez-nous

  • This field is for validation purposes and should be left unchanged.
Fermer

Les brevets les plus récents