Portable digital infrared thermography system

• US 5,637,871 A
• Filed: 06/07/1995
• Issued: 06/10/1997
• Est. Priority Date: 06/07/1993
• Status: Expired due to Term

• Current Assignee: CSI Technology Incorporated (Emerson Electric Company)
• Original Assignee: Computational Systems Incorporated (Emerson Electric Company)
• Inventors: Carpenter, Terry G., Piety, Kenneth R., Battenberg, Rexford A.
• Primary Examiner(s): Glick, Edward J.
• Application Number:
  US08/486,763
• Time in Patent Office: 734 Days
• Field of Search: 250/330, 250/332, 250/334, 250/358.1
• US Class Current: 250/330
• CPC Class Codes: G01J 2005/0077 Imaging
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/48 Thermography; Techniques using wholly visual means
• CPC Class Codes: G01N 25/72 Investigating presence of flaws

Abstract

A highly portable infrared thermography system automates the collection, display, analysis, annotation, and recording of thermographic data and facilitates the efficient generation of reports. The system includes an infrared camera and a digital video data collector (VDC) having an embedded PC with an internal hard drive. The VDC also includes a VGA color LCD display with touch screen overlay for displaying images, presenting information to a thermographer, and for receiving data and command inputs from the thermographer. The system can be carried with a custom vest and battery belt, or it can be mounted to a hand truck. Thermographic images captured by the infrared camera are received by the VDC and displayed in real time at rates of at least thirty frames per second to eliminate flicker. The VDC also interfaces with a videotape recorder for displaying and recording images. Other interfaces include a visible image camera interface, a digital video interface, and a base station computer interface. Images of interest are stored on the VDC'"'"'s hard drive where they can be retrieved for analysis and report generation in the field. A portable printer can be attached to the VDC to enable the thermographer to print reports as they are generated. Images can be annotated by the thermographer on the display, and the annotated images stored. The display is operable to prompt the thermographer with route information regarding particular equipment to be thermograhically inspected, and to suggest particular problems possibly indicated by a particular thermographically-observed condition.

Claims

1. A digital infrared thermography system for producing and recording thermographic images of objects, the system comprising:

a portable infrared camera for capturing thermographic images of objects and for producing an electronic thermographic image signal corresponding to said thermographic images;

a digital data processing and recording device for receiving and processing said electronic thermographic image signal to produce a formatted digital signal in the form of a plurality of frames of images, said data processing and recording device including means for performing multiple tasks simultaneously;

digital display means for receiving said formatted digital signal and displaying images corresponding to said formatted digital signal on a first portion of the display while simultaneously displaying on a second portion of the display information allowing a user to perform multiple tasks;

means for selecting individual frames of said formatted digital signal and producing digital frame signals; and

digital storage means for storing said digital frame signals.

2. The thermography system as described in claim 1, wherein said digital display means for displaying information to perform multiple tasks comprises means for prompting a user through indications on said display with information selected from the group consisting of location and identification information for equipment to be monitored, and instruction information regarding camera location for particular measurement points.

3. The thermography system as described in claim 1, wherein said digital display means for displaying information to perform multiple tasks comprises means for diagnosing monitored faults.

4. The thermography system as described in claim 1, further comprising a high speed path dedicated to routing the formatted digital signal to said digital display means for display of the formatted digital signal at a rate of at least thirty frames of images per second.

5. The thermography system as described in claim 1, wherein said digital data processing and recording device comprises a video digitizer for digitizing and multiplexing the electronic thermographic image signal to produce the formatted digital signal.

6. The thermography system as described in claim 5, further comprising:

a visible image camera for capturing visible images of objects and for producing an electronic visible image signal corresponding to said visible images; and

said video digitizer receiving the electronic visible image signal and digitizing and multiplexing the electronic visible image signal with the electronic thermographic image signal to produce the formatted digital signal.

7. The thermography system as described in claim 6, wherein said visible image camera further comprises an S-video output for providing the electronic visible image signal to said video digitizer in S-video format, said data processing and recording device further comprising an S-video interface for receiving the electronic visible image signal in S-video format.

8. The thermography system as described in claim 6, wherein at least one of said infrared and visible image cameras further comprise a digital output for producing a digital image signal corresponding to captured images, said data processing and recording device further comprising means for receiving and formatting the digital image signal to produce the formatted digital signal.

9. The thermography system as described in claim 8, wherein said means for receiving and formatting comprises a programmable logic array programmable to format the digital image signal for further processing by the data processing and recording device.

10. The thermography system as described in claim 8, further comprising a high speed path dedicated to routing the formatted digital signal to said digital display means for display of the formatted digital signal at a rate of at least thirty frames of images per second.

11. The thermography system as described in claim 1, wherein:

said infrared camera further comprising a digital output for producing a digital thermographic image signal corresponding to said thermographic images;

said data processing and recording device further comprising means for receiving and formatting the digital thermographic image signal to produce the formatted digital signal; and

further comprising a high speed path dedicated to routing the formatted digital signal to said digital display means for display of the formatted digital signal at a rate of at least thirty frames of images per second.

12. The thermography system as described in claim 1, wherein said data processing and recording device maintains a record of identifying information related to stored digital frame signals.

13. The thermography system as described in claim 1, further comprising interface means for interfacing said data processing and recording device to an external computer.

14. The thermography system as described in claim 1, wherein said data processing and recording device is further operable to perform thermographic analyses of the formatted digital signal.

15. The thermography system as described in claim 1, wherein said digital display means comprise a touch screen display.

16. The thermography system as described in claim 1, further comprising a battery for providing power to said system.

17. The thermography system as described in claim 1, further comprising means for supporting on a person'"'"'s body at least said data processing and recording device.

18. The thermography system as described in claim 17, wherein said means for supporting comprises a carrying vest worn by a user.

19. The thermography system as described in claim 1, further comprising a printer connected to said data processing and recording device for printing at least images.

20. The thermography system as described in claim 1, wherein said data processing and recording device is further operable to allow a user to produce reports.

21. The thermography system as described in claim 1, wherein said data processing and recording device comprises an embedded computer for controlling the processing and display of the formatted digital signal and for controlling the storing of the digital frame signals.

22. The thermography system as described in claim 1, wherein said digital storage means comprise a hard drive internal to said data processing and recording device.

23. The thermography system as described in claim 1, wherein said data processing and recording device is operable to annotate the selected digital frame signals while displayed on the digital display means.

24. A digital infrared thermography unit for processing, displaying, and recording at least thermographic images as represented by thermographic image signals comprising individual frames of thermographic images, said unit comprising:

a camera interface for receiving at least thermographic image signals produced by an infrared camera;

a video digitizer for digitizing and multiplexing image signals received by the camera interface, producing multiplexed image signals;

digital display means for receiving at least thermographic images as represented by said multiplexed image signals;

a high speed path dedicated to routing at least the multiplexed image signals to said display means for display of the multiplexed image signals at a rate of at least thirty frames of images per second;

means for displaying said multiplexed image signals on a first portion of the display while simultaneously displaying on a second portion of the display information allowing a user to perform multiple tasks;

means for selecting individual frames of said multiplexed image signals and producing digital frame signals;

an internal memory for storing said digital frame signals;

an embedded computer for controlling the processing and display of the multiplexed image signal, and for controlling the storage of the selected digital frame signals in said memory; and

a databus interconnecting at least the video digitizer, digital display means, means for selecting, and embedded computer.

25. The thermography system as described in claim 24, wherein said digital display means for displaying information to perform multiple tasks comprises means for prompting a user through indications on said display with information selected from the group consisting of location and identification information for equipment to be monitored, and instruction information regarding camera location for particular measurement points.

26. The thermography system as described in claim 24, wherein said digital display means for displaying information to perform multiple tasks comprises means for diagnosing monitored faults.

27. The thermography unit as described in claim 24, wherein said camera interface is further operable to receive visible image signals produced by a visible image camera.

28. The thermography unit as described in claim 24, wherein said camera interface is further operable to receive visible image signals produced by a visible image camera in S-video format.

29. The thermography unit as described in claim 24, further comprising a digital video signal interface for receiving digital video signals comprised of individual frames of images at a rate of at least thirty frames of images per second.

30. The thermography unit as described in claim 29, further comprising a programmable logic array programmable for converting said digital video signals to a format readily useable by said unit, producing a formatted digital image signal, wherein the formatted digital image signal is received by said high speed path and routed to said display means at a rate of at least thirty frames of images per second.

31. The thermography unit as described in claim 24, wherein said unit is further operable to interface with an external image storage device for at least retrieving stored thermographic images.

32. The thermography unit as described in claim 24, wherein said display means further comprises a touch screen display for accepting user inputs.

33. The thermography unit as described in claim 24, wherein said unit is operable to allow a user to annotate said thermographic images and to record the annotated images.

34. The thermography unit as described in claim 24, wherein said unit maintains a record of identifying information related to recorded images.

35. The thermography unit as described in claim 24, further comprising an external computer interface for communicating data to an external computer.

36. The thermography unit as described in claim 24, wherein said internal memory comprises an internal hard disk.

37. The thermography unit as described in claim 24, further comprising means for supporting said unit on a person.

38. The thermography unit as described in claim 37, wherein said means for supporting said unit comprises a carrying vest worn by a person.

39. The thermography unit as described in claim 37, wherein said means for supporting said unit comprises a hand truck.

40. A digital infrared thermography system for producing, processing, displaying, and recording thermographic and visible images of objects, the system comprising:

a infrared camera for capturing thermographic images of objects and for producing an electronic thermographic image signal comprising individual frames of thermographic images corresponding to the captured thermographic images;

a visible image camera for capturing visible images of objects and for producing an electronic visible image signal comprising individual frames of visible images corresponding to the captured visible images;

a video data collector for receiving, processing, displaying, and recording said thermographic and visible image signals, comprising;

a camera interface connected to said infrared and visible image cameras for receiving said thermographic and visible image signals;

a video digitizer for digitizing and multiplexing the image signals received by said interface, producing multiplexed image signals;

a digital video signal interface for receiving digital video signals comprised of individual frames of images;

a programmable logic array for converting said digital video signals to a format readily useable by said data collector, producing formatted image signals;

a touch screen display for displaying thermographic and visible images as represented by the multiplexed and formatted image signals;

means for selecting and annotating individual frames of the multiplexed and formatted image signals, producing selected digital frame signals;

an internal hard drive for recording the selected digital frame signals; and

an embedded computer for controlling the processing and displaying of the multiplexed and formatted image signals, and for controlling the selecting, annotating, and recording of the selected digital frame signals;

a battery for providing power to said system; and

a carrying vest for supporting at least said video data collector on a person'"'"'s body.