초록 ▼

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

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.

대표청구항 ▼

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

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; said end portion being constituted by a cone having a radius of curvature which is small enough to ensure that the forces of capillarity are insufficient to maintain a drop of liquid on said pointed end portion when said probe is in a liquid medium and to produce a total internal reflection effect of said light at said pointed end portion when the probe is in gaseous medium.