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AssigneeElectricite de France
InventorsHerve Arditty, Gilles Le Boudec, Philippe Graindorge, Jean-Pierre Gerardin, Jean-Louis Lesne, Dominique Meyet
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The discriminating device comprises an optical coupler (4) having at least three ends (5 to 8) to which are connected a semiconductor source of light (1) whose intensity is modulated, a semiconductor photoconductor (2) and an optical probe constituted by a multi-mode optical fibre (3) whose end has a pointed shape. This discriminating device is in particular applicable in a device for measuring the voluminal fraction of at least one fluid of a current of non-mixible fluids.
A device for discriminating fluids having different refractive indices, comprising in combination an optical fibre coupler with optical fibers having at least three ends, a semiconductor source of light combined with a circuit for modulating the intensity of said source of light and connected to one of said three ends, a semiconductor photodetector connected to another of said three ends, and an optical probe connected to a third of said three ends and comprising a multimode optical fibre which has the same refractive index profile as the fibres of the coupler and an end portion in the shape of a point;
A device for discriminating fluids having different refractive indices, comprising in combination an optical fibre coupler with optical fibers having at least three ends, a semiconductor source of light combined with a circuit for modulating the intensity of said source of light and connected to one of said three ends, a semiconductor photodetector connected to another of said three ends, and an optical probe connected to a third of said three ends and comprising a multimode optical fibre which has the same refractive index profile as the fibres of the coupler and an end portion in the shape of a point obtained by a hot drawing out of said end portion;
A device for measuring the voluminal fraction of at least one fluid of a current of non-mixible fluids comprising a fluid discriminating device delivering an output signal, a circuit for integrating the output signal of the discriminating circuit, said discriminating device being adapted to discriminate fluids having different refractive indices and comprising in combination an optical fibre coupler having at least three ends, a semiconductor source of light combined with a circuit for modulating the intensity of said course of light and connected to one of said three ends, a semiconductor photodetector connected to another of said three ends, and an optical probe connected to a third of said three ends and comprising a multimode optical fibre which has the same refractive index profile as the fibres of the coupler and an end portion in the shape of a point obtained by a hot drawing out of said end portion, a synchronous amplifier for demodulating and filtering the output signal of the photodetector connected to said circuit for modulating said source of light and a circuit for discriminating levels at least one predetermined threshold connected to the synchronous amplifier for receiving an output signal of the synchronous amplifier;
A method of making a device for discriminating fluids having different refractive indices, said device comprising in combination an optical fibre coupler with optical fibers having at least three ends, a semiconductor source of light combined with a circuit for modulating the intensity of said source of light and connected to one of said three ends, a semiconductor photodetector connected to another of said three ends, and an optical probe connected to a third of said three ends and comprising a multimode optical fibre which has the same refractive index profile as the fibres of the coupler and an end portion in the shape of a point;
Dependencies are inferred from the claim text.