Safran

Nassim Salhi

Rabih Khazaka

Minh Chau Phan Huy

Rafik Hadjria

Ioannis Stasinopoulos

Oscar D'almeida

Baptiste Joël Christian Fedi

A method for measuring temperature and deformation of a part or structure on the basis of a single line of optical fiber having a single Bragg rating is provided. The method includes: interrogating the optical fiber based on two sampling frequencies; one being a low frequency and the other being a high frequency, said low frequency being suitable for sensing a slow rate of change corresponding to the temperature variation, and said high frequency being suitable for sensing a fast rate of change corresponding to vibrations; implementing an algorithmic block based on a blind-source-separation (BSS) technique, comprising a frequency analysis, a multivariate analysis and higher-order statistics; and returning to the time domain via an inverse Fourier transform.

Method and device for physically measuring environmental and operational conditions

In the field of measuring physical parameters with a multimode optical fiber, a system for measuring P physical parameters at one or more measurement points has one or more multimode optical fibers. The system includes: a light source generating a source optical signal, a multimode measurement optical fiber transporting optical signals in at least M distinct second predetermined propagation modes, M being an integer greater than or equal to P, the measurement optical fiber including a measurement section reflecting the optical signals with a wavelength variable according to physical parameters to be measured, a detection device measuring wavelengths of the optical signals reflected by the measurement section, and an optical module generating M signals from the source optical signal, the M signals each being injected into the measurement optical fiber to propagate in one of the modes, the optical module also transferring the optical signals reflected toward the detection device.

System for measuring a plurality of physical parameters at a measurement point with a multimode optical fiber

A measuring device including a measuring equipment that is configured to be optically interrogated by a measuring instrument with first optical signals in a first wavelength range, and a connecting optical fibre for optically connecting a measuring equipment to a measuring instrument. The connecting optical fibre includes at least a first optical core that is multimode in the first wavelength range and a second optical core that is single-mode in a second wavelength range. The connecting optical fibre includes at least one first segment of functionalised optical fibre that is such as to exhibit, at the second wavelength, and optical property that varies with an environmental parameter of the connecting optical fibre. The invention also relates to a measuring assembly and to an apparatus that includes such a measuring assembly.

Measuring device comprising a connecting optical fibre and a measuring equipment for instrumentation of an aeronautical system, and an aeronautical system comprising such a measuring device

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Moissy-Cramayel, France

Nassim Salhi