Thales

Gérard Roux

Vito Suppa

Martine Doisy

Raphael Lardat

Thomas Pastureaud

Raphaël Lardat

Gilles Lubrano

Sylvie Ponthus

Christophe Oubaiche

François-Xavier Launay

François - Xavier Launay

Romain Barreau

A holder and at least one terminal element that are configured and arranged with respect to one another so as to form a cavity of length &#x394;L bounded axially by two walls the relative position of which with respect to each other varies in the opposite direction to the variation in ambient temperature, an increase in temperature causing the walls to move closer together and vice versa. A linear structure incorporating the device sees its length decrease when temperature increases and vice versa. Electro-optical transducers comprising a piezoelectric actuator of linear structure that acts on the length of a segment of optical fiber that forms the laser source of the transducer, and having such a device incorporated into the actuator in order to compensate, by modifying the length of the segment of fiber, for the variations in wavelength induced in the laser by the variations in temperature.

Temperature-compensating device and electro optic transponder implementing such a device

There is provided a method for manufacturing an optical-fibre sensor device, including an enclosure defining a cavity and an optical-fibre sensor including an optical-fibre and a device for holding the sensor rigidly connected to the optical fibre, the optical fibre passing through the holding device between two attachment points. The method comprises: positioning the optical-fibre sensor in the enclosure to pass the fibre through two passage openings provided on the enclosure, which defines two optical-fibre portions in the enclosure, on either side of the holding device, each fibre portion extending between one of the attachment points and one of the passage openings; holding the optical-fibre sensor in position; performing a differential elongation of the enclosure relative to the optical-fibre sensor in the longitudinal direction and towards the outside of the enclosure, the optical-fibre sensor remaining held in position; attaching the optical fibre to the enclosure at the passage openings.

Optical-fibre sensor device

The invention relates to acoustic transducers which comprise a ceramic ring formed from a pre-stressed set of segments. It consists in using, as screws for tightening pre-stressing wedges, screws with hexagonal heads and in placing on the inner face of these wedges a plate provided with recesses in which the cants of these screw heads become anchored. This plate comprises transverse channels allowing the passage of the power supply wires for the sectors. The central screw is removed after the desired pre-stressing has been obtained. It makes it possible to improve the manufacture of these transducers.

Acoustic transducer with prestressed ring

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Sophia Antipolis, France

Gérard Roux