Rotor system for measuring the flow rate of a fluid comprising a liquid, and associated equipment

A system for measuring a flow rate of a fluid comprising liquid, comprising:

• a body comprising at least one inlet, at least one outlet, and at least one passage for a flow of the fluid from the inlet to the outlet;
• at least one rotor disposed inside the at least one passage and configured to be rotated, by the flow of the fluid, about an axis substantially parallel to a main direction according to which the fluid is intended to flow into the passage;
• and
• a device for measuring a rotation speed of the rotor, the measuring device comprising
• a module for emitting an incident light radiation,
• an optical module configured to
• transmit the incident light radiation from the emission module on vanes of the rotor, and
• receive a reflected light radiation, the reflected light radiation coming from a reflection, on the vanes of the rotor, of the incident light radiation, and
• a conversion module configured to
• determine the rotation speed of the rotor according to the reflected light radiation, and
• determine the flow rate of the fluid according to the rotation speed of the rotor, wherein the optical module is configured such that the incident light radiation is incident on the vanes of the rotor in a direction substantially perpendicular to the axis of rotation of the rotor,
• the measuring device further comprises a module for connecting the optical module to the body, the connection module being configured to establish a fluid seal junction between the optical module and the passage, and
• the rotor comprises a plurality of vanes, at least one vane of the plurality of vanes having a reflection coefficient of a light radiation different from a reflection coefficient of the light radiation of at least one other vane of the plurality of vanes.