System for detecting conductive coatings on non-conductive medium surfaces

• US 8,723,944 B1
• Filed: 09/27/2010
• Issued: 05/13/2014
• Est. Priority Date: 09/28/2009
• Status: Active Grant

• Current Assignee: EDTM, Inc.
• Original Assignee: EDTM, Inc.
• Inventors: Imbrock, Mark A., Simpson, Jeffrey A., Martens, Jed, Strimpel, Nathan
• Primary Examiner(s): Perungavoor, Sath V
• Assistant Examiner(s): Brown, Jr., Howard D
• Application Number:
  US12/891,384
• Time in Patent Office: 1,324 Days
• Field of Search: 348/87
• US Class Current: 348/87
• CPC Class Codes: G01B 11/0625 with measurement of absorption or reflection
• CPC Class Codes: G01B 17/025 for measuring thickness of coating
• CPC Class Codes: G01B 7/085 for measuring thickness of coating

Abstract

Methods and apparatuses for detecting the presence and/or location of any conductive coating on a non-conductive medium surface are described.

Claims

1. A method for detecting at least one conductive coating on at least one non-conductive medium having a defined thickness, comprising:

i) measuring capacitance of at least one conductive coating on at least one surface of the at least one non-conductive medium;

ii) comparing the measured capacitance data of step i) with the thickness of the at least one non-conductive medium;

wherein the step ii) includes comparing;

a) at least one measured capacitance value and/or any results that occur from a changing capacitance value, to

b) a range of stored capacitance value data and/or trigger point(s) that correspond to the medium thickness; and

,

iii) identifying the presence and surface location of the at least one conductive coating on the surface of the non-conductive medium.

2. The method of claim 1, wherein step ii) includes measuring the thickness of the non-conductive medium.

3. The method of claim 1, when the non-conductive medium comprises two or more sheets of the non-conductive medium, and the method further includes:

iv) correlating the measured capacitance data of step i) and the thickness of the non-conductive medium with a width of a gap between the two or more sheets of the medium.

4. The method of claim 1, wherein the method includes accumulating and storing additional capacitance values for one or more non-conductive mediums.

5. The method of claim 1, wherein the method includes:

generating and measuring a first capacitance for any conductive layer present on a first surface of a first non-conductive medium;

generating and measuring a second capacitance for any conductive layer present on a second surface of the first non-conductive medium;

generating and measuring a third capacitance for any conductive layer on a third or a fourth surface of a second non-conductive medium; and

generating a fourth capacitance for the absence of any conductive coatings.

6. The method of claim 1, wherein the method includes:

independently measuring and/or manually entering data on the medium thickness and/or gap width.

7. The method of claim 1, wherein the method includes pre-programming known capacitance data associated with a given thickness(es) of the medium(s) and any gap widths.

8. The method of claim 1, wherein the method includes:

calibrating one or two thicknesses of the medium wherein, by calibrating with one or more known capacitance values and/or trigger points, the method can obtain valid results for the given thicknesses of the medium(s) and/or width of the gap(s).

9. The method of claim 1, wherein the method includes:

substantially minimizing environmental moisture and/or condensation from affecting accuracy of the measured capacitance.

10. The method of claim 1, wherein two or more non-conductive mediums are present in an assembly.

11. The method of claim 2, wherein step ii) includes measuring the thickness of the non-conductive medium using an ultrasonic sensor and/or a light sensor.

12. The method of claim 3, wherein the method includes measuring the width of the gap between adjacent mediums and comparing such width with the measured capacitance of step i).

13. The method of claim 11, wherein the method includes using data comprising the medium thickness(es) and/or data comprising the gap width(s) to:

i) select an appropriate representation of the stored capacitance value data and/or trigger point(s) for the medium thickness, and

ii) identify the presence and location of at least one conductive coating on the non-conductive medium.

14. The method of claim 11, wherein the method includes electronically measuring the medium thickness and/or the gap width, and optionally, collecting the electronically measured medium thickness and/or the gap width within a single apparatus or in a different instrument.

54. The method of claim 2, wherein the method includes measuring the medium thickness and/or the gap width using a charge coupled device (CCD) linear image array having a plurality of sensor elements, and the method further includes regulating energy carryover effects from one sensor element to another sensor element in the CCD linear image array.

55. The method of claim 54, wherein the method includes:

a) regulating energy carryover effects by;

a-1) controlling intensity of energy from an energy source as the energy is directed to the medium; and

/or

a-2) adjusting sensitivity of the CCD linear image array as the energy source is directed to the medium; and

/or

a-3) adjusting shutter speed of the CCD linear image array as the energy source is directed to the medium;

b) monitoring the intensity of reflections of the energy from the medium onto the CCD linear image array; and

,

c) substantially preventing the measured energy reflections of step b) from saturating or entering any other undesirable state, wherein the energy reflections have a peak reflection having a center, and

d) substantially preventing the center of the peak reflection and/or the peak reflection itself from shifting onto one or more adjacent pixel elements in the CCD linear image array when the measurement is performed.

15. A method for detecting at least one conductive coating on at least one non-conductive medium having a defined thickness, comprising:

i) measuring capacitance of at least one conductive coating on at least one surface of the at least one non-conductive medium;

ii) comparing the measured capacitance data of step i) with the thickness of the at least one non-conductive medium; and

,

iii) identifying the presence and surface location of the at least one conductive coating on the surface of the non-conductive medium;

wherein the method includes;

measuring a temperature of one or more of;

the non-conductive medium; and

an environment in which the non-conductive medium is present.

16. The method of claim 15, wherein the method includes measuring the temperature of the medium'"'"'s environment substantially simultaneously during the measuring of the capacitance.

17. The method of claim 15, wherein the method includes adjusting one or more corresponding capacitive measurements based on the measured temperature to yield a test result that is not impacted by varying temperature.

18. An apparatus for detecting the presence and surface location of at least one conductive coating on at least one surface of at least one non-conductive medium, comprising

a capacitive-measuring sensor configured to generate a capacitance value in the presence of a conductive layer on a surface of at least one non-conductive medium;

and

a processor configured for identifying the presence and surface location of one or more conductive coatings on at least one surface of the non-conductive medium by correlating a value of the capacitance measured with the thickness of the non-conductive medium;

wherein the processor is configured for comparing;

i) at least one measured capacitance value and/or any results occurring from a changing capacitance value, to

ii) a range of stored capacitance values and/or trigger points corresponding to the thickness of the non-conductive medium.

19. The apparatus of claim 18, further including a thickness-measuring sensor configured to measure the thickness of the at least one non-conductive medium.

20. The apparatus of claim 18, wherein the processor is configured for:

i) collecting and/or storing the measured capacitance values, and optionally, measured thicknesses, within the apparatus; and

/or

ii) collecting; and

/or storing the measured capacitance values, and optionally, measured thicknesses, at one or more devices remote from the apparatus.

21. The apparatus of claim 18, wherein the processor is configured for independently measuring and/or allowing for manual entering of data on the thickness of the non-conductive medium and/or any gap width between adjacent non-conductive mediums.

22. The apparatus of claim 18, wherein the processor is configured for accepting a known capacitance value associated with a given thickness of the non-conductive medium and any width of a gap between adjacent non-conductive mediums.

23. The apparatus of claim 18, wherein the processor is configured for accumulating and/or storing additional data comprised of measured capacitance values for various non-conductive mediums.

24. The apparatus of claim 19, wherein the thickness-measuring sensor is further configured to measure a width of a gap between two adjacent non-conductive mediums.

25. The apparatus of claim 19, wherein the thickness-measuring sensor comprises an ultrasonic sensor.

26. The apparatus of claim 19, wherein the thickness-measuring sensor comprises a light sensor.

27. The apparatus of claim 24, wherein the processor is configured for further correlating the width of the gap with the measured capacitance value.

28. The apparatus of claim 19, wherein the processor is configured for electronically measuring the thickness of one or more non-conductive mediums and a width of any gap separating adjacent non-conductive mediums.

31. The apparatus of claim 18, wherein the capacitance-measuring sensor comprises sensing plates that are configured to form an electric circuit with a conductive coating, when present.

32. The apparatus of claim 18, further including a moisture protective material that substantially fills a space around the sensing plates.

33. The apparatus of claim 32, wherein the moisture protective material comprises one or more of foam, insulation and/or desiccant material.

56. The apparatus of claim 19, wherein the thickness-measuring sensor comprises a charge coupled device (CCD) linear image array comprised of a plurality of sensor elements, the CCD linear image array being configured to regulate energy carryover effects from one sensor element to another sensor element.

57. The apparatus of claim 56, wherein the processor is configured for:

a-1) controlling intensity of energy from the energy source as the energy is directed to the medium; and

/or

a-2) adjusting sensitivity of the CCD linear image array as the energy source is directed to the medium; and

/or

a-3) adjusting a shutter speed of the CCD linear image array as the energy source is directed to the medium;

b) monitoring the intensity of reflections of the energy from the medium onto the CCD linear image array; and

,

c) substantially preventing the measured energy reflections of step b) from saturating or entering any other undesirable state, wherein the energy reflections have a peak reflection having a center; and

d) substantially preventing the center of the peak reflection and/or the peak reflection itself from shifting onto one or more adjacent pixel elements in the CCD linear image array.

29. An apparatus for detecting the presence and surface location of at least one conductive coating on at least one surface of at least one non-conductive medium, comprising

a capacitive-measuring sensor configured to generate a capacitance value in the presence of a conductive layer on a surface of at least one non-conductive medium;

and

a processor configured for identifying the presence and surface location of one or more conductive coatings on at least one surface of the non-conductive medium by correlating a value of the capacitance measured with the thickness of the non-conductive medium; and

a temperature sensor configured for measuring temperatures of one or more of;

the non-conductive medium;

an environment in which the non-conductive medium is present;

a sensor configured for measuring the capacitance; and

sensor configured for measuring the thickness of the non-conductive medium;

wherein the temperature sensor is configured for measuring the temperature of the medium and the environment substantially simultaneously during the measuring of the capacitance values.

30. An apparatus for detecting the presence and surface location of at least one conductive coating on at least one surface of at least one non-conductive medium, comprising

a capacitive-measuring sensor configured to generate a capacitance value in the presence of a conductive layer on a surface of at least one non-conductive medium;

and

a processor configured for identifying the presence and surface location of one or more conductive coatings on at least one surface of the non-conductive medium by correlating a value of the capacitance measured with the thickness of the non-conductive medium; and

a temperature sensor configured for measuring temperatures of one or more of;

the non-conductive medium;

an environment in which the non-conductive medium is present;

a sensor configured for measuring the capacitance; and

sensor configured for measuring the thickness of the non-conductive medium;

wherein the processor is configured for adjusting one or more corresponding capacitive measurements based on a measured thermal response to yield a test result that is not impacted by varying temperatures.

34. A method for measuring thickness of a medium using a charge coupled device (CCD) linear image array having a plurality of sensor elements, the method comprising regulating energy carryover effects from one sensor element to another sensor element;

wherein the method includes;

a) regulating energy carryover effects by;

a-1) controlling intensity of energy from an energy source as the energy is directed to the medium; and

/or

a-2) adjusting sensitivity of the CCD linear image array as the energy source is directed to the medium; and

/or

a-3) adjusting shutter speed of the CCD linear image array as the energy source is directed to the medium;

b) monitoring the intensity of reflections of the energy from the medium onto the CCD linear image array; and

,

c) substantially preventing the measured energy reflections of step b) from saturating or entering any other undesirable state, wherein the energy reflections have a peak reflection having a center, and

d) substantially preventing the center of the peak reflection and/or the peak reflection itself from shifting onto one or more adjacent pixel elements than desired on the CCD linear image array when the measurement is performed.

35. The method of claim 34, wherein an average thickness of the mediums being measured is resolved by taking the mathematical average of any, or all, of the sensor elements comprising the peak reflection.

36. The method of claim 34, including determining the average thickness by measuring the weighted average from the intensity of any, or all, of the sensor elements.

37. The method of claim 34, including finding the center of the reflected peak by determining the location of one or more of the sensor elements in the CCD linear image array.

38. The method of claim 34, including allowing the excess energy of one sensor element to be transferred to one or more adjacent sensor elements.

39. The method of claim 34, including controlling the amount of time the energy source directs energy onto the medium.

40. The method of claim 34, including substantially preventing the measured reflections on the CCD linear image array from saturating the CCD linear image array at particular locations on the CCD linear image array when the thickness measurement is being performed.

41. The method of claim 34, including substantially preventing the center of the peak reflection to shift on the CCD linear image array.

42. The method of claim 34, wherein the CCD linear image array comprises a CCD linear image array that allows each sensor element'"'"'s excess energy to be transferred to an adjacent sensor element.

43. The method of claim 34, further including measuring an average thickness of gap spaces between adjacent mediums.

44. An apparatus for measuring a thickness of a medium, comprising a charge coupled device (CCD) array comprised of a plurality of sensor elements, the apparatus being configured to regulate energy carryover effects from one sensor element to another sensor element;

an energy source, a sensor comprised of the CCD linear image array, and a processor configured for;

a-1) controlling intensity of energy from the energy source as the energy is directed to the medium; and

/or

a-2) adjusting sensitivity of the CCD linear image array as the energy source is directed to the medium; and

/or

a-3) adjusting a shutter speed of the CCD linear image array as the energy source is directed to the medium;

b) monitoring the intensity of reflections of the energy from the medium onto the CCD linear image array; and

,

c) substantially preventing the measured energy reflections of step b) from saturating or entering any other undesirable state, wherein the energy reflections have a peak reflection having a center; and

d) substantially preventing the center of the peak reflection and/or the peak reflection itself from shifting onto one or more adjacent pixel elements in the CCD linear image array.

45. The apparatus of claim 44, wherein the processor is configured to resolve an average thickness by taking the mathematical average of any, or all, of the sensor elements comprising the peak reflection.

46. The apparatus of claim 45, wherein the processor is configured for determining an average thickness by measuring the weighted average from the intensity of any, or all, of the sensor elements.

47. The apparatus of claim 45, wherein the processor is configured for finding the center of the reflected peak by determining one or more locations of the sensor elements in the CCD linear image array.

48. The apparatus of claim 44, wherein the processor is configured for allowing each sensor element'"'"'s excess energy to be transferred to one or more adjacent sensor elements.

49. The apparatus of claim 44, wherein the processor is configured for controlling the amount of time the energy source directs energy onto the medium.

50. The apparatus of claim 44, wherein the processor is configured to substantially prevent the measured reflections on the CCD linear image array from saturating the CCD linear image array at particular locations on the CCD linear image when the thickness measurement is being performed.

51. The apparatus of claim 44, wherein the processor is configured for substantially preventing the center of the peak reflection to shift on the CCD linear image array.

52. The apparatus of claim 44, wherein the CCD linear image array comprises a CCD linear image array configured to allow each sensor element'"'"'s excess energy to be transferred to an adjacent sensor element.

53. The apparatus of claim 44, including a processor configured for measuring an average width of a gap between adjacent mediums.