Commissariat a L'energie Atomique

Jean-Claude Gaucher

Pierre Ferdinand

Sylvain Magne

Alain Lansiart

Alain Seigneur

Jean Lequais

Jean-Luc Moretti

Annick Quettier

The present invention relates to a high capacity, high signal-to-noise ratio sensor incorporating an array of Bragg grating transducers photoinscribed on a dielectric guide and a feedback loop incorporating a wavelength selective element which is time modulated making it possible to obtain a laser sensor selectively switched by each Bragg grating. Application to monitoring strains or temperatures in a structure.

Photoinscribed bragg grating sensor with a good signal-to-noise ratio

Process for the production of a device for the optical analysis of a microparticle flux and application to the production of a cytofluorimeter. As microparticles are able to emit light, around a nozzle (4) made from a material transparent to said light and whose hole (8) is provided for the passage of the flux, is moulded an optical element (6) made from a material transparent to said light, which has a melting point below that of the material of the nozzle and which has an optical index close to that of said material, and which has a dioptric element (10) admitting an optical axis passing through the hole. The cytofluorimeter in particular incorporates the device (2) obtained by this process.

Process for the production of a device for the optical analysis of a

Optical device with a high collection efficiency and cytofluorimeter using the same. This device permits the light excitation of a flow of material directed along an axis and able to emit light when it receives it and/or collects the light emitted by said flow. It comprises a first optical element and a spherical analysis chamber which can be penetrated by the flow, defined by the element and allowing a center of symmetry. The element has a convex spherical dioptre allowing an axis of symmetry passing through the center of the chamber and said element is positioned in such a way that the axis of the flow passes through the center of the chamber. Application to the analysis of a flow of biological cells.

Optical device with a high collection efficiency and cytofluorimeter

The camera comprises an emitting section and a receiving section which are both located on the surface of a portion of a cylinder. The receiving section consists of juxtaposed and parallel strips located in the central part of the portion of cylinder. The emitting section consists of two groups each constituted by a band of parallel strips which is placed on each side of the receiving section. Each emitter is constituted by a pair of strips having parallel sides each forming part of a directrix of the cylinder. Electronic means are provided for exciting the different emitting strips and collecting the signals received by the different receiving strips.

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le Val Saint Germain, France

Jean-Claude Gaucher