US 7,406,883 B2Granted

Compact device for measuring the speed and the direction of rotation of an object

AssigneeSchlumberger Technology Corporation

InventorsMarian Faur, Jacques Sellin, Bernard Parmentier

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Abstract

The invention concerns a device for measuring the speed and direction of rotation of an object (3) near to which it is placed. It comprises: a magnetic detection device (2) that delivers, in response to a rotation of the object (3) generating a magnetic field variation, signals representative of its speed and its 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, current receptor means (6) placed between the magnetic detection device (2) and the conductor (4) that create, from signals coming from said magnetic detection device (2), a modulation of the current (Iout) flowing in the conductor (4), said modulated current (Iout) reflecting both the speed and the direction of rotation of the object (3). Application particularly in the oil industry.

Claims19

Dependent claims

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.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/521,912Filed 25 Jun 2003
Priority: FR 02 0933123 Jul 2002
Published: US 2005/0235761 A127 Oct 2005
Granted: 5 Aug 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G01D 5/145
Using Hall-effect devices: influenced by the relative movement between the Hall device and magnetic fields
G01D 5/2451
Using a variable number of pulses in a train: incremental encoders
G01F 1/115
Using rotating vanes with axial admission: with magnetic or electromagnetic coupling to the indicating device
G01F 15/066
With transmission devices, e.g. mechanical: involving magnetic transmission devices

Family

US 2005/0235761 A1Pre-grant publication · published 27 Oct 2005
US 7,406,883 B2This patent

From the US filing history. Foreign family members aren’t listed.

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