Sensor slip fit apparatus and method

• US 7,047,813 B2
• Filed: 08/05/2003
• Issued: 05/23/2006
• Est. Priority Date: 08/05/2003
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Marsh, Brian J., Gall, Kenneth E.
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): ALLEN, ANDRE J
• Application Number:
  US10/635,351
• Publication Number:
  US 20050028600A1
• Time in Patent Office: 1,022 Days
• Field of Search: None
• US Class Current: 73/715
• CPC Class Codes: G01L 9/0025 with acoustic surface waves
• CPC Class Codes: G01L 9/0064 the element and the diaphragm being in intimate contact

Abstract

A sensor apparatus and method are disclosed herein. A base is generally located proximate to a cover. A sensor element (e.g., quartz, silicon, ceramic, and the like) can be located on the base, such that the cover and the base form a clearance between the cover and the base. The clearance can be configured such that when the cover is at its smallest dimension within the tolerance range thereof and the base is at its largest dimension within the tolerance range thereof there is a clearance between them. Additionally, a sensor diaphragm and a dimple can be incorporated into the cover, wherein the dimple is in intimate contact with the sensor element at all pressure levels and temperatures thereof.

Claims

1. A sensor apparatus, said apparatus comprising:

a base located proximate to a cover;

a sensor element located on said base, wherein said cover and said base form a clearance between said cover and said base; and

a sensor diaphragm and a dimple formed from and incorporated inwardly into said cover, wherein said dimple is in intimate contact with said sensor element at all pressure levels and temperatures thereof.

2. The apparatus of claim 1 wherein said sensor diaphragm comprises a pressure transducer sensor diaphragm.

3. The apparatus of claim 1 wherein said sensor element comprises quartz.

4. The apparatus of claim 1 wherein said sensor element comprises ceramic.

5. The apparatus of claim 1 wherein said sensor element comprises silicon.

6. The apparatus of claim 1 wherein said sensor apparatus comprises a pressure sensor.

7. The apparatus of claim 6 wherein said pressure sensor comprises a surface acoustic wave (SAW) pressure sensor.

8. The apparatus of claim 1 wherein said cover is soldered to said base when said cover is assembled to said base.

9. The apparatus of claim 1 wherein said cover is welded to said base when said cover is assembled to said base.

10. A surface acoustic wave (SAW) pressure sensor apparatus, said apparatus comprising:

a base located proximate to a cover;

a SAW sensor element comprising a sense element located on said base, wherein said cover and said base form a clearance between said cover and said base; and

a pressure transducer sensor diaphragm incorporated inwardly into said cover, wherein said pressure transducer sensor diaphragm contains a dimple that is also incorporated into said cover, wherein said dimple is in intimate contact with said SAW sensor element at all pressure levels and temperatures thereof.

11. A method for forming a sensor, said method comprising the steps of:

locating a base proximate to a cover;

positioning a sensor element on said base;

forming a clearance between said cover and said base; and

incorporating a sensor diaphragm and a dimple into said cover, wherein said dimple is formed inwardly into said cover and is in intimate contact with said sensor element at all pressure levels and temperatures thereof.

12. The method of claim 11 wherein said sensor diaphragm comprises a pressure transducer sensor diaphragm.

13. The method of claim 11 wherein said sensor element comprises quartz.

14. The method of claim 11 wherein said sensor element comprises ceramic.

15. The method of claim 11 wherein said sensor element comprises silicon.

16. The method of claim 11 wherein said sensor apparatus comprises a pressure sensor.

17. The method of claim 16 wherein said pressure sensor comprises a surface acoustic wave (SAW) pressure sensor.

18. The method of claim 11 further comprising the step of soldering said cover to said base when said cover is assembled to said base.

19. The method of claim 11 further comprising the step of welding said cover to said base when said cover is assembled to said base.

20. A method for forming a surface acoustic wave (SAW) pressure sensor apparatus, said method comprising the steps of:

locating a base proximate to a cover;

positioning a SAW sensor element comprising a sense element on said base, wherein said cover and said base form a clearance between said cover and said base; and

incorporating a pressure transducer sensor diaphragm into said cover, wherein said pressure transducer sensor diaphragm contains a dimple that is inwardly incorporated into said cover, wherein said dimple is in intimate contact with said SAW sensor element at all pressure levels and temperatures thereof.