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Thales

Universite Paris X

Jean-Jacques Bonnefois

Herve Lefevre

Cedric Molucon

Joachin Honthaas

Frederic Guattari

Gérard Berginc

Eric Ducloux

Cédric Molucon

Alain Priou

Karl Aubry

Hervé Lefevre

Frédéric Guattari

Géraldine Guida

An interferometric measurement device includes a broad-spectrum spontaneous emission light source; a measurement interferometer, receiving a light signal with input light power and delivering a modulated light signal with output light power, the modulated light signal being modulated at a modulation frequency, depending on a physical parameter to be measured and being proportional to the input light power; an optical radiation detector, receiving the modulated light signal exiting from the measurement interferometer and delivering a modulated electrical signal representative of the output light power; a filtering interferometer, insensitive to the physical parameter to be measured, having a free spectral range ISL and a finesse F selected such that an interval of frequencies, centerd around an optimal frequency fequal to (2k+1)ISL/2, k being a natural number, and of width &#x394;f equal to [0.9&#x2212;(3/2F)]ISL, includes the modulation frequency of the modulated light.

Interferometric measurement device comprising a filtering interferometer

A fiber-optic interferometric measurement device () intended to measure a physical parameter (QR), includes: a wide-spectrum light source (); a SAGNAC fiber-optic interferometer (), in which there propagate two counter-propagating light waves () including measurement elements () sensitive to the physical parameter that results in a non-reciprocal phase difference &#x394;&#x3c6;&#x3c1; between the two light waves; and a detector () delivering an electric signal representative of the physical parameter. The measurement elements include a ring resonator () in transmission mode including a first coupler () and a second coupler () respectively, which couple a first arm () and a second arm () respectively of the SAGNAC interferometer to the ring resonator, in such a way that the two light waves travel in opposing directions of travel (H,AH).

Fibre-optic interferometric measurement device comprising a ring resonator, gyrometer and inertial attitude or navigation unit comprising such a device

An interferometric system includes a polarization separation element (), a first polarization conversion element (), a Mach-Zehnder interferometer () including a first () and second () arms connected to one another by a first () and second () ends in order for a first and second beams () having the same polarization to pass through the interferometer in a reciprocal manner in opposite directions of propagation, respectively, so as to form a first and second interferometric beam (), a second polarization conversion element () for obtaining an interferometric beam (), the polarization of which is converted, a polarization-combining element (), and a detection element () suitable for detecting an output beam ().

Apolarized interferometric system, and apolarized interferometric measurement method

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Saint-Cloud, France

Jean-Jacques Bonnefois