Abstract: Disclosed is a method for reconstructing an electromagnetic vector wave backscattered in all or part of an optical fiber. According to an embodiment of the method a light signal of a frequency v0 or v0+vA is injected into the optical fiber. A step of polarization-resolved heterodyne optical detection includes the generation of at least two orthogonally polarized backscattered light signals, producing a beat preferably of a frequency vA. At least one photodetector converts the orthogonally polarized backscattered light signals into initial analog signals. Electrical homodyne detection is performed by an IQ demodulator so as to generate I and Q demodulated analog signals. A processing module reconstructs the electromagnetic vector wave backscattered in all or part of the optical fiber.

Abstract: The invention relates to a method (1) for reconstructing an electromagnetic vector wave backscattered in all or part of an optical fiber (106), comprising: A step (200) of injecting into the optical fiber (106) a light signal of a frequency v0 or v0+vA, A step (300) of polarization-resolved heterodyne optical detection including the generation of at least two orthogonally polarized backscattered light signals, producing a beat preferably of a frequency vA, A step (400) of converting, by at least one photodetector (203), the orthogonally polarized backscattered light signals into initial analog signals, A step (500) of electrical homodyne detection, by an IQ demodulator (211, 302), so as to generate I (I1, I2) and Q (Q1, Q2) demodulated analog signals, and A step (600) of reconstructing, by a processing module (209), the electromagnetic vector wave backscattered in all or part of the optical fiber (106).

Abstract: The invention relates to a maintenance device (1) for determining the position of a blockage point (2) of a tubular member (3), characterized in that it includes a fiber-optic cable (40) and a plurality of holding guides (20), each holding guide (20) being attached to the fiber-optic cable (40) and including a means (21) for attaching to the tubular member (3). The invention also relates to a method and a system for determining the position of a blockage point of a tubular member.

Abstract: The invention relates to a maintenance device (1) for determining the position of a blockage point (2) of a tubular member (3), characterized in that it includes a fiber-optic cable (40) and a plurality of holding guides (20), each holding guide (20) being attached to the fiber-optic cable (40) and including a means (21) for attaching to the tubular member (3). The invention also relates to a method and a system for determining the position of a blockage point of a tubular member.

Abstract: The invention relates to an optoelectronic distributed measuring device based on optical fiber, said device comprising a continuous light source (1) emitting a continuous light signal at a first frequency ?0, an acousto-optical modulator (6) capable of transforming said continuous signal into a pulse signal to be injected into an optical fiber (15) to be tested, and a photodetection module (10) capable of detecting a backscattering signal from a Rayleigh backscattering and a spontaneous Brillouin backscattering from said optical fiber (15) to be tested, said device being characterized in that it further comprises a first coupler (3) and a second coupler (9), said second coupler (9) being capable of mixing the signal of the local oscillator with the backscattering signal from said optical fiber (15) to be tested before transmitting it to the photodetection module (10), the backscattering signal being modulated at least at a frequency ?rB equal to ?0??bref+?A+?bAS, where ?bAS is the anti-Stokes Brillouin (backs

Abstract: The invention relates to an optoelectronic distributed measuring device based on optical fiber, said device comprising a continuous light source (1) emitting a continuous light signal at a first frequency ?0, an acousto-optical modulator (6) capable of transforming said continuous signal into a pulse signal to be injected into an optical fiber (15) to be tested, and a photodetection module (10) capable of detecting a backscattering signal from a Rayleigh backscattering and a spontaneous Brillouin backscattering from said optical fiber (15) to be tested, said device being characterized in that it further comprises a first coupler (3) and a second coupler (9), said second coupler (9) being capable of mixing the signal of the local oscillator with the backscattering signal from said optical fiber (15) to be tested before transmitting it to the photodetection module (10), the backscattering signal being modulated at least at a frequency ?rB equal to ?0??bref+?A+?bAS, where ?bAS is the anti-Stokes Brillouin (backs

Abstract: The invention relates to a method for digitally processing a signal from an optoelectronic distributed measuring device based on Brillouin scattering, said device comprising a continuous light source (1), a coupler (2), an acousto-optic modulator (3), an optical fiber (5) to be tested so that it emits in return a signal by spontaneous Brillouin backscattering at a frequency ?F equal to ?p??Bz, where ?Bz is the Brillouin frequency to be measured at every point z of said optical fiber (5), a local oscillator (16) emitting another light signal intended to be mixed with said return signal emitted by Brillouin backscattering by said optical fiber (5) to be tested, a detection module (9) able to detect said Brillouin shift frequency ?Bz at every point z of said optical fiber and a processing module for linking this Brillouin shift frequency ?Bz at every point z of said optical fiber to a temperature value and a strain value.

Abstract: The invention relates to a method for digitally processing a signal from an optoelectronic distributed measuring device based on Brillouin scattering, said device comprising a continuous light source (1), a coupler (2), an acousto-optic modulator (3), an optical fiber (5) to be tested so that it emits in return a signal by spontaneous Brillouin backscattering at a frequency ?F equal to ?p??Bz, where ?Bz is the Brillouin frequency to be measured at every point z of said optical fiber (5), a local oscillator (16) emitting another light signal intended to be mixed with said return signal emitted by Brillouin backscattering by said optical fiber (5) to be tested, a detection module (9) able to detect said Brillouin shift frequency ?Bz at every point z of said optical fiber and a processing module for linking this Brillouin shift frequency ?Bz at every point z of said optical fiber to a temperature value and a strain value.