Prognostic health monitoring of fluidic systems using MEMS technology

• US 6,471,853 B1
• Filed: 11/22/2000
• Issued: 10/29/2002
• Est. Priority Date: 11/22/2000
• Status: Expired due to Term

• Current Assignee: PTI Technologies, Inc. (ESCO Technologies, Inc.)
• Original Assignee: PTI Technologies, Inc. (ESCO Technologies, Inc.)
• Inventors: Moscaritolo, Daniel
• Primary Examiner(s): Drodge, Joseph W.
• Application Number:
  US09/721,499
• Time in Patent Office: 706 Days
• Field of Search: 210/85, 210/87, 210/90, 210/91, 210/93, 210/103, 210/143, 210/130, 210/440, 210/443, 210/321.6, 210/321, 210/69, 210/636, 210/739, 210/149, 738/665, 964/17, 964/20--22
• US Class Current: 210/85
• CPC Class Codes: A61M 2005/1652 Filter with duct, e.g. filtering element incorporated in a flow line, tube, duct
• CPC Class Codes: A61M 2205/0244 Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology
• CPC Class Codes: A61M 2205/3327 Measuring
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 5/165 Filtering accessories, e.g. blood filters, filters for infusion liquids A61M1/14 , A61M1/34, A61M1/3627, A61M1/3679, A61M1/3687 take precedence; needle sets with incorporated air inlet filters A61M5/162
• CPC Class Codes: B01D 2201/54 Computerised or programmable systems
• CPC Class Codes: B01D 35/143 Filter condition indicators
• CPC Class Codes: B01D 37/046 by pressure measuring

Abstract

The present invention is directed to a filter module that may incorporate sensors to measure various characteristics of fluid flow and filtration. The sensors may be MEMS and may measure the temperature, flow rate, pressure, etc. of the fluid. One or more MEMS sensors may be included in a sensor package which, in turn, may be included in a sensor component. The latter, which may also include a processor, conductor pins, etc. for data communication, may be coupled to a sensor port in such a way as to allow contact between the sensor(s) and the fluid. Sensor measurements may be used to determine the occurrence of harmful events, such as cavitation or particle breakthrough, or to predict the remaining service life of a filter element.

Claims

1. A filter module for filtering a fluid, said filter module comprising:

a filter element receiving said fluid in an unfiltered state at an inlet side and producing said fluid in a filtered state at an outlet side;

a filter manifold having an inlet fluid flow cavity and an outlet fluid flow cavity, said inlet fluid flow cavity configured to transmit said fluid to said inlet side and said outlet fluid flow cavity configured to transmit said fluid from said outlet side;

a sensor port having a first end exposed to at least one of said inlet fluid flow cavity and said outlet fluid flow cavity; and

a sensor component coupled to said sensor port, said sensor component having a micro-electro-mechanical systems (MEMS) sensor package disposed proximate said first end such that said MEMS sensor package is in contact with said fluid,

wherein said MEMS sensor package includes a MEMS sensor and is configured to measure at least one of a fluid flow characteristic and a filtration characteristic and to communicate said measurement to at least one of a processor and a data processing device.

2. The filter module according to claim 1, wherein said sensor component is removably coupled to said sensor port.

3. The filter module according to claim 1, said sensor package including a temperature sensor.

4. The filter module according to claim 1, said sensor package including a flow rate sensor.

5. The filter module according to claim 1, said sensor package including a pressure sensor.

6. The filter module according to claim 5, wherein said pressure sensor is configured to measure differential pressure.

7. The filter module according to claim 1, wherein said sensor port has a first end exposed to said inlet fluid flow cavity and further including:

a second sensor port having a first end exposed to said outlet fluid flow cavity; and

a second sensor component coupled to said second sensor port, said second sensor component having a second sensor package disposed proximate said first end of said second sensor port such that said second sensor package is in contact with said fluid.

8. The filter module according to claim 7, wherein said second sensor package includes a second MEMS sensor.

9. The filter module according to claim 7, wherein said second sensor package is configured to measure at least one of a fluid flow characteristic and a filtration characteristic and to communicate said measurement to said at least one of a processor and a data processing device.

10. The filter module according to claim 9, wherein said second sensor package is configured to communicate said measurement to said at least one of a processor and a data processing device in real-time.

11. The filter module according to claim 1, wherein at least one of said sensor port and said sensor component further include an auto-configuration feature.

12. The filter module according to claim 11, wherein said sensor package is configured to communicate said measurement only if a configuration signal is received from said auto-configuration feature.

13. The filter module according to claim 1, said sensor component further including a processor.

14. The filter module according to claim 13, wherein said sensor package is configured to take a measurement upon receiving a signal from said processor of said sensor component.

15. The filter module according to claim 14, at least one of said sensor component and said sensor port including an auto-configuration feature and wherein said processor of said sensor component is configured to produce said signal only after receiving a configuration signal from said auto-configuration feature.

16. The filter module according to claim 1, wherein said sensor package is flush with said fluid as it flows through the at least one of said inlet fluid flow cavity and said outlet fluid flow cavity.

17. The filter module according to claim 1, said sensor component further including conductive pins configured to mate with a data processing device.

18. The filter module according to claim 1, wherein said sensor package is configured to communicate said measurement in real-time.

19. A filter module for filtering a fluid, said filter module comprising:

a filter element receiving said fluid in an unfiltered state at an inlet side and producing said fluid in a filtered state at an outlet side, said filter element having a first end, an interior containing said fluid in a filtered state, an exterior containing fluid in an unfiltered state and a membrane separating said interior from said exterior;

a filter body bounding said exterior of said filter element;

an end cap coupled to said first end of said filter element;

a sensor port having a first end exposed to said interior of said filter element and a second end exposed to said exterior of said filter element; and

a sensor component coupled to said sensor port, said sensor component having a micro-electro-mechanical systems MEMS sensor package,

wherein said MEMS sensor package includes a MEMS sensor and is configured to measure at least one of a fluid flow characteristic and a filtration characteristic and to communicate said measurement to at least one of a processor and a data processing device.

20. The filter module of claim 19, said sensor package including a differential pressure sensor.

21. A filter module for filtering a fluid, said filter module comprising:

a filter element receiving said fluid in an unfiltered state at an inlet side and producing said fluid in a filtered state at an outlet side;

a first sensor component having a first micro-electro-mechanical systems (MEMS) sensor disposed proximate said inlet side of said filter element such that said first MEMS sensor is in contact with said fluid; and

a second sensor component having a second MEMS sensor disposed proximate said outlet side of said filter element such that said second MEMS sensor is in contact with said fluid,

wherein each of said first and second MEMS sensors is configured to measure at least one of a fluid flow characteristic and a filtration characteristic and to communicate said measurement to at least one of a processor and a data processing device.

22. The filter module according to claim 21, wherein each of said first and second MEMS sensors is configured to communicate said measurement in real-time.

23. The filter module according to claim 21, further including a filter manifold having an inlet fluid flow cavity and an outlet fluid flow cavity, said inlet fluid flow cavity configured to transmit said fluid to said inlet side and said outlet fluid flow cavity configured to transmit said fluid from said outlet side, wherein each said MEMS sensor has a front face that is in contact with said fluid, and wherein the front face of said first MEMS sensor is flush with an interior surface of said inlet fluid flow cavity and the front face of said second MEMS sensor is flush with an interior surface of said outlet fluid flow cavity.

24. The filter module according to claim 23, further including:

a first sensor port having a first end exposed to said inlet fluid flow cavity; and

a second sensor port having a first end exposed to said outlet fluid flow cavity,

wherein said first sensor component is coupled to said first sensor port and said second sensor component is coupled to said second sensor port.

25. The filter module according to claim 24, wherein at least one of said first sensor port and said first sensor component further includes a first auto-configuration package, and at least one of said second sensor port, second sensor component, and second MEMS sensor further includes a second auto-configuration feature.

26. The filter module according to claim 25, wherein said first MEMS sensor is configured to communicate its measurement only if a configuration signal is received from said first auto-configuration feature, and wherein said second MEMS sensor is configured to communicate its measurement only if a configuration signal is received from said second auto-configuration feature.

27. The filter module according to claim 21, wherein each of said first and second MEMS sensors is a MEMS pressure sensor.

28. The filter module according to claim 27, each said MEMS pressure sensor comprising:

a pressure reference chamber;

a pressure sensor diaphragm, said diaphragm separating said fluid from said pressure reference chamber; and

a conductive element coupled to said diaphragm, said conductive element having a variable resistance that depends on an amount of deflection of said conductive element.

29. The filter module according to claim 28, wherein said conductive element is configured to deflect when a pressure difference exists between said fluid and said pressure reference chamber thereby allowing said pressure difference to be measured as a function of the change in said resistance of said conductive element.

30. The filter module according to claim 28, each said MEMS pressure sensor further including a conductive lead that is configured to electrically couple said conductive element to a bridge circuit having a reference resistance.

31. The filter module according to claim 28, wherein said conductive element is a piezoelectric element.

32. The filter module according to claim 28, wherein said conductive element is affixed to a surface of said diaphragm.

33. The filter module according to claim 28, wherein said conductive element is embedded within said diaphragm.

34. The filter module according to claim 21, wherein each said MEMS sensor component includes a plurality of MEMS sensors.

35. The filter module according to claim 21, wherein each said MEMS sensor component includes redundant sensors.

36. The filter module according to claim 21, each of said first and second sensor components further including a processor.

37. The filter module according to claim 36, wherein said first MEMS sensor is configured to take a measurement upon receiving a first signal from the processor of said first sensor component, and said second MWMS sensor is configured to take a measurement upon receiving a second signal from the processor of said second sensor component.

38. The filter module according to claim 37, wherein each said sensor component includes an auto-configuration feature.

39. The filter module according to claim 21, wherein each of said first and second MEMS sensors is a MEMS temperature sensor.

40. The filter module according to claim 38, each said MEMS temperature sensor comprising a resistive element having a variable, temperature-dependent resistance, wherein said resistive element is configured to have an electrical current applied thereacross, thereby allowing said fluid'"'"'s temperature to be measured as a function of the voltage drop across said resistive element.

41. The filter module according to claim 40, wherein said resistive element is supported by a temperature sensor diaphragm.