Patent ID: 7406883

Claim:
Device for measuring the speed and direction of rotation of a non-magnetic propeller integral with at least one magnet, the propeller being in a flow and being near to where the device is placed, the device comprising: a magnetic detection device ( 2 ) that delivers, in response to a rotation of the propeller generating a magnetic field variation, signals representative of the propeller's speed and direction of rotation, a conductor ( 4 ) intended to be connected to a power source to supply current to the magnetic detection device ( 2 ) at least, a current receptor means ( 6 ) placed between the magnetic detection device ( 2 ) and the conductor ( 4 ) that creates, from signals coming from the magnetic detection device ( 2 ), a modulation of the current (Iout) flowing in the conductor ( 4 ), wherein the frequency of the modulated current (Iout) or the number of transitions that it has reflects the speed of the propeller, and the form of the modulated current (Iout) reflects the direction of rotation of the propeller.