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1. WO2016148704 - MULTI-SURFACE VISCOSITY MEASUREMENT

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[ EN ]

What is claimed is:

1. A system for measuring the viscosity of a fluid, comprising:

a rotor cup having an inner chamber;

a first bob rotatably disposed within a first region of the inner chamber; and

a second bob rotatably disposed within a second region of the inner chamber, wherein the second bob rotates relative to the first bob based on a difference in viscosity of fluid in the first region and the second region.

2. The system of claim 1 , wherein the first bob is connected to a first shaft and the second bob is connected to a second shaft.

3. The system of claim 2, wherein the first shaft is concentric to the second shaft.

4. The system of claim 2, further comprising a first sensor connected to the first shaft

capable of detecting a first property of the first bob and a second sensor connected to the second shaft capable of detecting a second property of the second bob.

5. The system of claim 1 , further comprising a torque transducer connecting the first bob to the second bob.

6. The system of claim 1 , further comprising a motor capable of rotating the rotor cup about the first bob and the second bob.

7. The system of claim 1, further comprising a heater disposed adjacent to the rotor cup capable of heating the rotor cup and fluid contained therein.

8. The system of claim 1 , wherein the fluid includes a non-homogeneous fluid.

9. A method for measuring the viscosity of a fluid, comprising:

containing the fluid within a rotor cup having a first bob rotatably disposed within a first region of the rotor cup and a second bob rotatably disposed within a second region of the rotor cup;

rotating the rotor cup and the fluid disposed therein;

sensing a first property of the first bob;

sensing a second property of the second bob;

determining a first viscosity of the fluid in the first region based on the first property of the first bob; and

determining a second viscosity of the fluid in the second region based on the second property of the second bob.

10. The method of claim 5, wherein the first property includes a first angular acceleration of the first bob and the second property includes a second angular acceleration of the second bob.

1 1. The method of claim 6, wherein the first property includes a first torque of the first bob and the second property includes a second torque of the second bob.

12. The method of claim 6, wherein the fluid is a non-homogeneous fluid.

13. The method of claim 6, further comprising heating the rotor cup and fluid contained

therein.

14. A viscometer, comprising:

a rotor cup;

a plurality of bobs rotatably disposed within the rotor cup, wherein the plurality of bobs includes a proximate bob and a distal bob;

a plurality of measurement regions defined within the rotor cup, wherein discrete bobs are disposed within discrete measurement regions; and

a first sensor capable of detecting a first property of the proximate bob indicative of the viscosity of the fluid within a proximate measurement region and a second sensor capable of detecting a second property of the distal bob indicative of the viscosity of the fluid within a distal measurement region.

15. The viscometer of claim 14, wherein the proximate bob is connected to a first shaft and the distal bob is connected to a second shaft, and wherein the second shaft is concentric to the first shaft.

16. The viscometer of claim 14, wherein the proximate bob and the distal bob are connected via at least one torque transducer.

17. The viscometer of claim 16, further comprising an anchor torque transducer connected to the distal bob and a rotor cup inner wall located at an opposite end from the proximate bob.

18. The viscometer of claim 14, further comprising a non-homogeneous fluid disposed

within the rotor cup.

19. The viscometer of claim 14, wherein each of the plurality of bobs is axially aligned with one another and extend along a length of the rotor cup.

20. The viscometer of claim 14, wherein the first and second sensors are capable of detecting a rotational property of each of the plurality of bobs.