Centre National De La Recherche Scientifique

Universitë De Bordeaux

Eric Freysz

Jean-Francois Letard

Jean-François Letard

Jean-Paul Robert-Arnouil

Benoit Philippeau

A method and system for visualizing infrared radiation emitted by a source, the visualizing system including a substrate, at least one solid temperature-sensitive layer containing thermochromic pigments having at least one transition temperature TH associated with a visible color change, and at least one intermediate layer placed between the substrate and the solid layer containing thermochromic pigments; the substrate, the at least one intermediate layer and the solid temperature-sensitive layer containing thermochromic pigments forming a multilayer suitable for absorbing infrared electromagnetic radiation and for inducing a local temperature increase dT; and the at least one intermediate layer being suitable for transferring, by thermal conduction, the local temperature increase dT to a region of the solid temperature-sensitive layer, so as to induce a local change in the visible color of the solid temperature-sensitive layer of thermochromic pigments.

Method and system for visualising infrared electromagnetic radiation emitted by a source

A system for transferring electrical energy to thermal energy which comprises two electrodes separated by a distance along the axis joining them and able to create field lines defining a zone of influence when subjected to a potential difference, an electrical power supply device for these electrodes, which is able to provide the potential difference, and a device for triggering an electric arc between these two electrodes. The triggering device comprises a device for emitting a laser pulse, a device for focusing the pulse at N focusing points situated in the zone of influence of the two electrodes, with a peak power density of the pulse per focusing point of greater than 1 GW/cm, N being determined as a function of the peak power of the pulse and of the distance d which is fixed, so as to form an electrically conducting zone between the two electrodes.

System for converting electric energy into thermal energy

A method is provided for the thermal photoswitching of spin-transition compounds from the low-spin state to the high-spin state, including at least one step of exposing the material to a non-polarized laser beam which is at room temperature, and the wavelength of which is in the infrared range and the power of which is 1 mW&#xb7;cmto 1 W&#xb7;cm. The method may be used for the temporary or permanent marking of materials including particles of at least one spin-transition compound including an iron(II) and triazole ligand compound.

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Pessac, France

Eric Freysz