MINIATURE STIMULATING AND SENSING SYSTEM

• US 20090322557A1
• Filed: 03/06/2006
• Published: 12/31/2009
• Est. Priority Date: 03/07/2005
• Status: Active Grant

• Current Assignee: Hottinger Bruel & Kjaer Incorporated
• Original Assignee: MicroStrain, Inc. (Spectris PLC)
• Inventors: Arms, Steven W., Townsend, Christopher P., Hamel, Michael J., Churchill, David L., Robb, John Chamberlain
• Granted Patent: US 7,668,667 B2
• Time in Patent Office: Days
• US Class Current: 340/870.3
• CPC Class Codes: G01M 5/0033 by determining damage, crack or wear
• CPC Class Codes: G01M 5/0066 by exciting or detecting vibration or acceleration vibration testing of structures G01M7/00
• CPC Class Codes: G01N 2291/0258 Structural degradation, e.g. fatigue of composites, ageing of oils
• CPC Class Codes: G01N 2291/0427 Flexural waves, plate waves, e.g. Lamb waves, tuning fork, cantilever
• CPC Class Codes: G01N 2291/2694 Wings or other aircraft parts
• CPC Class Codes: G01N 29/043 in the interior, e.g. by shear waves

Abstract

An electronic system for testing a material includes at least one module for mechanically mounting on the material. The module includes a signal generator for generating a signal generator signal. The module also includes a stimulus signal delivering device (SSDD) and an SSDD circuit for providing a device signal derived from said signal generator signal to the material. The module also includes a sensor and a sensor circuit for receiving an interaction signal derived from interaction of the device signal with the material.

Claims

1. An electronic system for testing a material, the system comprising:

at least one module for mechanically mounting to the material, said at least one module including;

a signal generator for generating a signal generator signal;

a stimulus signal delivering device (SSDD) and an SSDD circuit for providing a device signal to the material wherein said device signal is derived from said signal generator signal, and wherein said device signal provided to the material includes a first type of energy, wherein interaction of said device signal with said material produces an interaction signal, wherein said interaction signal includes said first type of energy; and

a sensor and a sensor circuit for receiving said interaction signal, wherein said sensor is sensitive to said first type of energy.

2. An electronic system as recited in claim 1, wherein said signal generator is programmable.

3. An electronic system as recited in claim 2, wherein said signal generator signal includes a multifrequency waveform having a waveform shape including multiple frequencies.

4. An electronic system as recited in claim 2, wherein at least one from the group consisting of waveform shape, duration of signals, number of signals provided, and timing of signals provided by said signal generator is programmable.

5. An electronic system as recited in claim 2, wherein said programmable signal generator includes a microprocessor programmable to provide a desired stimulus signal.

6. An electronic system as recited in claim 5, wherein said programmable signal generator includes a memory device for storing digital signal levels.

7. An electronic system as recited in claim 6, wherein said memory device is capable of storing a plurality of digitized data sets of digital signal levels.

8. An electronic system as recited in claim 7, wherein said microprocessor is capable of selecting from said digitized data sets of digital signal levels under program control to provide said signal generator signal.

9. An electronic system as recited in claim 2, wherein said programmable signal generator includes a digital to analog converter for providing said digital signal levels as an analog signal.

10. An electronic system as recited in claim 1, wherein said SSDD includes at least one from the group consisting of an actuator, a capacitor, an inductor, a resistor, and an electrode.

11. An electronic system as recited in claim 10, wherein said capacitor includes the material as a capacitor dielectric.

12. An electronic system as recited in claim 10, wherein said actuator includes a piezoelectric transducer.

13. An electronic system as recited in claim 1, wherein said at least one module further comprises a recording device for recording said interaction signal.

14. An electronic system as recited in claim 13, wherein said recording device is programmable.

15. An electronic system as recited in claim 14, wherein at least one of gain, offset, time data is collected, number of points collected, and acquisition rate by said recording device is programmable.

16. An electronic system as recited in claim 1, wherein said at least one module further comprises a microprocessor for analyzing said received signal to determine a property of the material.

17. An electronic system as recited in claim 16, wherein said microprocessor is capable of directing sampling data at a frequency of 1 Hz or higher.

18. An electronic system as recited in claim 17, wherein said data sampling frequency is programmable.

19. An electronic system as recited in claim 1, wherein said SSDD and said sensor are included in a single physical device.

20. An electronic system as recited in claim 19, wherein said single physical device is connected to said SSDD circuit and to said sensor circuit.

21. An electronic system as recited in claim 20, wherein said single physical device is connected to said SSDD circuit at a first time and to said sensor circuit at a second time different from said first time.

22. An electronic system as recited in claim 19, further comprising a plurality of said single physical devices all connected to a single SSDD circuit and to a single sensor circuit.

23. An electronic system as recited in claim 19, wherein single physical device includes at least one from the group consisting of a piezo device, a capacitor, an inductor, a resistor, and an electrode.

24. An electronic system as recited in claim 1, wherein said sensor circuit includes an a/d converter linked to said sensor to provide said received signal as digital data.

25. An electronic system as recited in claim 24, wherein said at least one module further comprises a signal conditioning, wherein said sensor provides said received signal to said signal conditioning, said signal conditioning including an amplifier for amplifying said received signal for providing to said a/d converter.

26. An electronic system as recited in claim 24, wherein said at least one module further comprises a first data storage device linked to said a/d converter, said first data storage device for storing said digital data.

27. An electronic system as recited in claim 26, wherein said first data storage device includes at least one from the group consisting of DRAM, SRAM, and NVRAM.

28. An electronic system as recited in claim 1, wherein said at least one module further comprises a communications link.

29. An electronic system as recited in claim 28, wherein said communications link is for transmitting data derived from said received signal.

30. An electronic system as recited in claim 28, wherein said communications link is for transmitting at least one from the group consisting of status and settings information and configuration parameters.

31. An electronic system as recited in claim 28, wherein said communications link is for receiving at least one from the group consisting of data, programs, and commands.

32. An electronic system as recited in claim 28, wherein said communications link includes at least one from the group consisting of a USB and a wireless link.

33. An electronic system as recited in claim 32, wherein said wireless link includes a data transceiver.

34. An electronic system as recited in claim 1, wherein said at least one module further comprises a microprocessor and a high voltage conversion electronics, said high voltage conversion electronics connected between said microprocessor and said SSDD, wherein said microprocessor controls output of said SSDD by providing a control signal to said high voltage conversion electronics.

35. An electronic system as recited in claim 1, wherein said signal generator is programmable, wherein said at least one module further comprises a first energy storage device, a digital recording device, and a communications link, said first energy storage device connected to provide power to run said programmable signal generator, said digital recording device, and said communications link.

36. An electronic system as recited in claim 35, wherein said first energy storage device includes a thin film battery.

37. An electronic system as recited in claim 35, wherein said at least one module further comprises a second energy storage device, said second energy storage device connected to provide a high current pulse.

38. An electronic system as recited in claim 35, wherein said at least one module further comprises a wireless battery charger connected to receive energy to recharge said first energy storage device.

39. An electronic system as recited in claim 38, wherein said wireless battery charger is coupled to receive power inductively.

40. An electronic system as recited in claim 38, wherein said wireless battery charger is coupled to receive power from apparatus for harvesting energy from its environment.

41. An electronic system as recited in claim 40, wherein said apparatus for harvesting energy from the environment converts at least one from the group consisting of light, vibration, and mechanical movement to electricity.

42. An electronic system as recited in claim 1, wherein said at least one module further comprises apparatus for harvesting energy from its environment wherein all energy for powering said signal generator, said SSDD and said circuit for receiving an interaction signal derived from interaction of said device signal with the material is derived from said energy harvesting apparatus.

43. An electronic system as recited in claim 1, further comprising a plurality of said modules linked in a network.

44. An electronic system as recited in claim 43, wherein said plurality of said modules are wired together.

45. An electronic system as recited in claim 43, wherein each said module of said plurality of modules has an address.

46. An electronic system as recited in claim 43, further comprising a reader, wherein said plurality of said modules are wirelessly linked to said reader.

47. An electronic system as recited in claim 43, wherein one of said modules can receive a command from another of said modules.

48. An electronic system as recited in claim 1, wherein said at least one module is capable of being mechanically mounted to the material so as to operate without interfering with normal use of the material.

58. An electronic system as recited in claim 1, wherein said first type of energy consists of acoustic energy.

59. An electronic system as recited in claim 58, wherein said SSDD includes a piezoelectric transducer, wherein said piezoelectric transducer converts said signal generator signal into said acoustic energy.

60. An electronic system as recited in claim 59, wherein said sensor includes a sensor piezoelectric transducer, wherein said sensor piezoelectric transducer converts said acoustic energy into an electrical signal.

61. An electronic system as recited in claim 1, wherein said first type of energy consists of electrical energy.

62. An electronic system as recited in claim 61, wherein said sensor includes a device for measuring an electrical parameter.

63. An electronic system as recited in claim 62, wherein said sensor includes an electrical impedance measuring device.

64. An electronic system as recited in claim 63, wherein said sensor provides electrical impedance as a function of frequency.

49. A method of operating a structure, comprising:

(a) mounting an stimulus signal delivering device (SSDD) and a sensor to a portion of the structure;

(b) mounting a first electronic circuit to said portion for stimulating said SSDD to provide a device signal to said structure, wherein said device signal includes a first type of energy, wherein said sensor is sensitive to said first type of energy and wherein said sensor provides information based on sensing said first type of energy;

(c) mounting a second electronic circuit to said structure for receiving said information from said sensor, wherein said second electronic circuit includes memory for storing said information; and

(d) while operating the structure in normal operation using said first electronic circuit, said SSDD, said sensor, said information, and said second electronic circuit to determine a property of said portion.

50. A method as recited in claim 49, comprising permanently mounting said SSDD and permanently mounting said first electronic circuit.

51. A method as recited in claim 49, wherein said structure includes at least one from the group consisting of a car, a truck, an aircraft, a water craft, a building, a pipeline, a bridge, a road, a machine, a tool, a living organism, and a geologic formation.

65. An electronic system as recited in claim 49, wherein said first type of energy consists of acoustic energy.

66. An electronic system as recited in claim 65, wherein said SSDD includes a piezoelectric transducer, wherein said piezoelectric transducer converts said signal generator signal into said acoustic energy.

67. An electronic system as recited in claim 66, wherein said sensor includes a sensor piezoelectric transducer, wherein said sensor piezoelectric transducer converts said acoustic energy into an electrical signal.

68. An electronic system as recited in claim 49, wherein said first type of energy consists of electrical energy.

69. An electronic system as recited in claim 68, wherein said sensor includes a device for measuring an electrical parameter.

70. An electronic system as recited in claim 69, wherein said sensor includes an electrical impedance measuring device.

71. An electronic system as recited in claim 70, wherein said sensor provides electrical impedance as a function of frequency.

52. A method of operating a structure, comprising:

(a) mounting a signal generator to the structure, said signal generator for generating a signal generator signal;

(b) mounting a stimulus signal delivering device (SSDD) to the structure, said SSDD for providing a device signal to the structure wherein said device signal is derived from said signal generator signal, and wherein said device signal provided to the structure includes electromagnetic energy; and

(c) mounting a circuit to the structure for receiving an interaction signal, wherein said interaction signal is derived from interaction of said device signal with the structure, wherein said circuit is sensitive to a signal from said structure wherein said signal from said structure includes electromagnetic energy.

53. An electronic system for testing a material, the system comprising:

a combining device having a first port, a second port, and an antenna port;

a first RF signal source connected to said first port;

an impedance spectroscopy circuit having a second RF signal source connected to said second port, wherein said second RF signal source provides an RF signal that varies over a range of frequencies; and

a conductor coupled to the material and connected to said antenna port, wherein said conductor serves as both an antenna for RF communication and as a probe for impedance spectroscopy, wherein said conductor coupled to the material has an impedance at each frequency of said range of frequencies, wherein said impedance spectroscopy circuit is connected for detecting said impedance at each frequency of said range of frequencies, wherein said impedance spectroscopy circuit provides impedance data for determining a parameter of the material.

54. An electronic system as recited in claim 53, wherein said first RF signal source is part of a transmitter, further comprising a receiver to provide two way communications.

55. An electronic system as recited in claim 53, wherein said impedance spectroscopy circuit includes an impedance measurement portion.

56. An electronic system as recited in claim 53, wherein said conductor is coupled to a material and is for measuring properties of the material.

57. An electronic system as recited in claim 53, wherein said material includes at least one from the group consisting of a bone, a material subject to curing, a composite material, and concrete.

72. An electronic system as recited in claim 53, wherein said second RF signal source is capable of sweeping over a range of frequencies.

73. An electronic system as recited in claim 53, wherein said second RF signal source is capable of providing a waveform including a range of frequencies.

74. An electronic system as recited in claim 53, wherein said impedance spectroscopy circuit detects both magnitude of impedance and phase of impedance at each said frequency, and wherein said impedance spectroscopy circuit is connected for at least one from the group consisting of recording and transmitting.

75. An electronic system as recited in claim 53, wherein said parameter of the material includes at least one from the group consisting of a property of the material, an environmental influence on the material, a displacement of the material, and a strain of the material.

76. An electronic system as recited in claim 53, wherein said combining device is a duplexer.

77. An electronic system as recited in claim 53, wherein said combining device is a diplexer.