Accelerometer and methods thereof

• US 6,854,330 B2
• Filed: 10/24/2002
• Issued: 02/15/2005
• Est. Priority Date: 10/26/2001
• Status: Expired due to Fees

• Current Assignee: Nth Tech Corporation
• Original Assignee: Nth Tech Corporation
• Inventors: Potter, Michael D.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): SAINT SURIN, JACQUES M
• Application Number:
  US10/280,299
• Publication Number:
  US 20030079543A1
• Time in Patent Office: 845 Days
• Field of Search: 735/142.5, 735/143.2, 735/143.6, 361/281, 361/283.3, 361/283.4, 310/309, 310/308
• US Class Current: 73/514.25
• CPC Class Codes: G01P 15/125 by capacitive pick-up
• CPC Class Codes: G01P 2015/0828 the mass being of the paddle type being suspended at one of its longitudinal ends

Abstract

An accelerometer includes a housing with a chamber, a member with a stored static charge, and a pair of electrodes connected to the housing. The member is connected to the housing and extends at least partially across the chamber. The pair of electrodes are each spaced from and on substantially opposing sides of the member from each other and are at least partially in alignment with each other. The member is movable with respect to the pair of electrodes or one of the pair of electrodes is movable with respect to the member.

Claims

1. An accelerometer comprising:

a non-conducting member with a stored static charge that remains substantially constant; and

a pair of electrodes are spaced from and on substantially opposing sides of the non-conducting member from each other and are at least partially in alignment with each other, wherein the non-conducting member is movable with respect to the pair of electrodes or one of the pair of electrodes is movable with respect to the non-conducting member in response to an acceleration.

2. The system as set forth in claim 1 further comprising an acceleration system coupled to the pair of electrodes, wherein movement of the member or one of the pair of electrodes in response to the acceleration generates a potential difference in the pair of electrodes, the acceleration system outputting an acceleration based on the potential difference.

3. The system as set forth in claim 1 further comprising a housing with a chamber, the member is connected to the housing and extends at least partially across the chamber and the electrodes are connected to the housing.

4. The system as set forth in claim 3 wherein the member is connected to the housing to form a cantilever beam.

5. The system as set forth in claim 4 further comprising at least one mass coupled to the member in the chamber.

6. The system as set forth in claim 4 further comprising a pair of masses coupled to the member in the chamber.

7. The system as set forth in claim 3 wherein the member is connected to the housing to form a diaphragm.

8. The system as set forth in claim 7 further comprising at least one mass coupled to the member in the chamber.

9. The system as set forth in claim 3 wherein at least one of the pair of electrodes is connected to extend across the chamber in the housing to form a diaphragm.

10. The system as set forth in claim 9 further comprising at least one mass coupled to the at least one of the pair of electrodes.

11. The system as set forth in claim 3 wherein at least one of the pair of electrodes is connected to extend partially across the chamber in the housing to form a cantilever beam.

12. The system as set forth in claim 1 wherein the member comprises two or more dielectric layers.

13. The system as set forth in claim 1 wherein the member comprises a single dielectric layer.

14. The system as set forth in claim 1 wherein the member is made from one or more materials selected from a group consisting of silicon oxide, silicon dioxide, silicon nitride, aluminum oxide, tantalum oxide, tantalum pentoxide, titanium oxide, titanium dioxide, barium strontium titanium oxide.

15. A method for making an accelerometer, the method comprising:

providing a non-conducting member with a stored static charge that remains substantially constant; and

providing a pair of electrodes, the electrodes are spaced from and on substantially opposing sides of the non-conducting member from each other and are at least partially in alignment with each other, wherein the non-conducting member is movable with respect to the pair of electrodes or one of the pair of electrodes is movable with respect to the non-conducting member in response to an acceleration.

16. The method as set forth in claim 15 further comprising providing an acceleration system coupled to the pair of electrodes, wherein movement of the member or one of the pair of electrodes in response to the acceleration generates a potential difference in the pair of electrodes, the acceleration system outputting an acceleration based on the potential difference.

17. The method as set forth in claim 15 further comprising providing a housing with a chamber, the member is connected to the housing and extends at least partially across the chamber and the electrodes are connected to the housing.

18. The method as set forth in claim 17 wherein the member is connected to the housing to form a cantilever beam.

19. The method as set forth in claim 18 further comprising at least one mass coupled to the member in the chamber.

20. The method as set forth in claim 18 further comprising a pair of masses coupled to the member in the chamber.

21. The method as set forth in claim 17 wherein the member is connected to the housing to form a diaphragm.

22. The method as set forth in claim 21 further comprising at least one mass coupled to the member in the chamber.

23. The method as set forth in claim 17 wherein at least one of the pair of electrodes is connected to extend across the chamber in the housing to form a diaphragm.

24. The method as set forth in claim 23 further comprising at least one mass coupled to the at least one of the pair of electrodes.

25. The method as set forth in claim 17 wherein at least one of the pair of electrodes is connected to extend partially across the chamber in the housing to form a cantilever beam.

26. The method as set forth in claim 15 wherein the member comprises two or more dielectric layers.

27. The method as set forth in claim 15 wherein the member comprises a single dielectric layer.

28. The method as set forth in claim 15 wherein the member is made from one or more materials selected from a group consisting of silicon oxide, silicon dioxide, silicon nitride, aluminum oxide, tantalum oxide, tantalum pentoxide, titanium oxide, titanium dioxide, barium strontium titanium oxide.

29. A method for measuring acceleration, the method comprising:

exposing at least one of a non-conducting member with a stored static charge that remains substantially constant or one of a pair of electrodes to an acceleration;

displacing the non-conducting member or one of the pair of electrodes in response to the acceleration;

producing a potential difference in the pair of electrodes which are spaced from and on substantially opposing sides of the non-conducting member from each other and are at least partially in alignment with each other; and

outputting the potential difference which represents a measurement of the acceleration.

30. The method as set forth in claim 29 wherein the member comprises two or more dielectric layers.

31. The method as set forth in claim 29 wherein the member comprises a single dielectric layer.

32. The method as set forth in claim 29 wherein the member is made from one or more materials selected from a group consisting of silicon oxide, silicon dioxide, silicon nitride, aluminum oxide, tantalum oxide, tantalum pentoxide, titanium oxide, titanium dioxide, barium strontium titanium oxide.

33. The method as set forth in claim 29 further comprising attaching at least one mass to the at least one of the member or one of the pair of electrodes to increase sensitivity to the acceleration.