Omnisens Sa

Etienne Rochat

Fabien Briffod

Jean-Charles Montavon

Fabien Ravet

Sanghoon Chin

Marc Nikles

Miguel González Herráez

Jacques Morel

Chin Sanghoon

Julien Gosteli

Alexandre Goy

Pedro José Vidal Moreno

An assembly assembled by a plurality of sections put together, wherein the section includes

Section and assembly comprising a plurality of such sections

Process and device for measurement of physical quantity based on Rayleigh backscattering

A device for calibrating distributing sensing technologies is presented. The device includes an optical fiber, a first input arranged for receiving at least one optical pulse and injecting this at least one optical pulse towards the optical fiber, an output arranged for receiving a backscattered signal generated in the optical fiber. The optical fiber includes at least one event, each event being a part of the optical fiber and having at least one modified physical state or property that is different from the physical state or property of the rest of the optical fiber. The device includes structure creating different optical paths for the at least one optical pulse, the different optical paths having different lengths, each optical path passing through the at least one event. The invention also relates to a process implemented in the device.

Calibration device for distributing sensing technologies

A method of determining deformation in a structure around which a sensing optical fiber is helically wound, includes performing a distributed measurement at a point along the fiber, to obtain a frequency gain spectrum at that point. Performing a distributed measurement includes, adjusting a pulse width of a pulse pump signal to achieve a predefined spatial resolution and providing the pulse pump signal with adjusted pulse width in the fiber to generate scattering, which is used to obtain the frequency gain spectrum. Identifying at least two curves which, when added together, best fit the frequency gain spectrum. Identifying the frequency at which peaks of the curves occur. Determining deformation in the structure by determining deformation in the fiber at the point using a frequency at which a peak of an identified curve occurs. The amount of deformation in the fiber corresponds to the amount of deformation in the structure.

Method of determining deformation in a structure

Brillouin optical distributed sensing device and method is provided and includes a structure for generating an optical pulsed signal and an optical probe signal. The structure includes a circulation component for directing the optical pulsed signal to a sensing optical fiber, and directing an optical measurement signal with Brillouin scattering information arising from the sensing optical fiber toward a detection apparatus. Also included is an optical routing component for configuring the device to allow generating: (i) according to a first configuration, an optical measurement signal with stimulated Brillouin scattering information resulting from the interaction of the optical pulsed signal, and an optical probe signal propagating in the sensing optical fiber in a direction opposite to the optical pulsed signal, or (ii) according to a second configuration, an optical measurement signal with spontaneous Brillouin scattering information resulting from the propagation of the optical pulsed signal in the sensing optical fiber.

Brillouin optical distributed sensing device and method with improved tolerance to sensor failure

A method for performing distributed pressure sensing including the steps of, forming a grating in a birefringent fiber, measuring the birefringence distribution along the length of the birefringent fiber, and determining pressure present along the length of the fiber using the measured the birefringence distribution. The invention also relates to a corresponding sensing device.

Method and device for pressure sensing

According to the invention, these aims are achieved by means of a sensor, suitable for sensing one or more properties of one or more structures, the sensor comprising, a first optical propagation path which is configurable to cooperate with a structure whose properties are to be sensed; a second optical propagation path which is configurable to cooperate with a structure whose properties are to be sensed; a third optical propagation path; a means for amplifying a signal which propagates in the third optical propagation path, so that the signal is amplified before it begins propagation along the second optical propagation path, and a means to prevent the propagation of signals from the second optical propagation path to the third optical propagation path. There is further provided a corresponding method of sensing.

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Valeyres sous Ursins, Switzerland

Etienne Rochat