Method for adjusting an object detection apparatus

• US 20080099662A1
• Filed: 10/31/2006
• Published: 05/01/2008
• Est. Priority Date: 10/31/2006
• Status: Abandoned Application

• Current Assignee: Muth Global Visions, LLC
• Original Assignee: Muth Global Visions, LLC
• Inventors: Musiel, Michael J., DeMaster, Bryan D., Alberti, Thomas P., Todd, Daniel R.
• Application Number:
  US11/591,130
• Publication Number:
  US 20080099662A1
• Time in Patent Office: Days
• US Class Current: 250/205
• CPC Class Codes: G01J 1/08 Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
• CPC Class Codes: G01J 1/32 adapted for automatic variation of the measured or reference value regulation of light intensity G05D25/00
• CPC Class Codes: G01S 17/18 wherein range gates are used
• CPC Class Codes: G01S 17/86 Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
• CPC Class Codes: G01S 17/89 for mapping or imaging
• CPC Class Codes: G01S 17/931 of land vehicles
• CPC Class Codes: G01S 7/4802 using analysis of echo signal for target characterisation; Target signature; Target cross-section
• CPC Class Codes: G01S 7/497 Means for monitoring or calibrating

Abstract

A method for adjusting an object detection apparatus is disclosed and which includes the steps of providing an image intensifier tube having an electroluminescent screen, and which produces a screen current output when the image intensifier tube processes electromagnetic radiation; measuring the screen current output produced by the electroluminescent screen; providing an emitter of electromagnetic radiation which is electrically coupled with a source of electricity, and which, when periodically energized, produces an electromagnetic radiation output; and adjusting the period of time which the emitter of electromagnetic radiation is energized based upon the screen current output which is measured at the electroluminescent screen.

Claims

1. A method for adjusting an object detection apparatus, comprising:

providing an image intensifier tube having a electroluminescent screen, and which produces a screen current output when the image intensifier tube processes electromagnetic radiation;

measuring the screen current output produced by the electroluminescent screen;

providing an emitter of electromagnetic radiation which is electrically coupled with a source of electricity, and which, when periodically energized, produces an electromagnetic radiation output; and

adjusting the period of time which the emitter of electromagnetic radiation is energized based upon the screen current output which is measured at the electroluminescent screen.

2. A method as claimed in claim 1, and further comprising:

providing a shutter assembly which is operably coupled to the image intensifier tube, and which, when activated and deactivated, causes the image intensifier tube to produce an image frame which is associated with the screen current output.

3. A method as claimed in claim 2, and wherein the shutter assembly when deactivated, at least partially, prevents the processing of electromagnetic radiation.

4. A method as claimed in claim 1, and further comprising:

providing a shutter assembly operably coupled to the image intensifier tube, and which can be activated and deactivated; and

providing a controller which is operably coupled to the image intensifier tube, emitter of electromagnetic radiation, and shutter assembly, and which continually energizes the image intensifier tube, and further selectively activates and deactivates the shutter assembly, and further energizes the emitter of electromagnetic radiation so as to produce a resulting light output generated from the electroluminescent screen which can be converted into a visibly discernible image.

5. A method as claimed in claim 1, and further comprising:

providing a controller which is operably coupled with the image intensifier tube and with the emitter of electromagnetic radiation;

selectively energizing the emitter of electromagnetic radiation to produce electromagnetic radiation pulses which are reflected from the object of interest; and

providing a shutter assembly which may be activated and deactivated.

6. A method as claimed in claim 5, and further comprising:

adjusting a time period delay between the selective energizing of the emitter of electromagnetic radiation, and the selective activating and deactivating of the shutter assembly.

7. A method as claimed in claim 5, and wherein the method further comprises:

selectively controlling the emitter of electromagnetic radiation to produce electromagnetic radiation which is reflected from the object of interest; and

selectively activating and deactivating the shutter assembly so as to cause the electroluminescent screen to produce a visibly discernible image.

8. A method as claimed in claim 7, and wherein the object of interest is traversing a given depth of field relative to the emitter of electromagnetic radiation, and wherein the method further comprises:

selectively adjusting the duration that the shutter assembly is activated and then deactivated as the object of interest traverses the depth of field so as to continually produce a visibly discernible image.

9. A method as claimed in claim 7, and wherein the step of selectively energizing the emitter of electromagnetic radiation further comprises adjusting a frequency with which the emitter of electromagnetic radiation is energized.

10. A method as claimed in claim 7, and wherein the step of selectively energizing the emitter of electromagnetic radiation further comprises adjusting a duration that the emitter of electromagnetic radiation is energized.

11. A method as claimed in claim 7, and wherein the step of selectively energizing the emitter of electromagnetic radiation further comprises adjusting an output intensity of the emitter of electromagnetic radiation when energized.

12. A method as claimed in claim 8, and further comprising:

before the step of selectively adjusting the duration that the shutter assembly is activated, and then deactivated, predicting, in time, the relative movement of the object of interest within the depth of field.

13. A method as claimed in claim 4, and further comprising:

providing a shutter assembly which is operably coupled to the controller and which is selectively activated and then deactivated so as to cause the electroluminescent screen to produce an image frame, and wherein the method further comprises;

measuring a screen current associated with a first image frame which is produced by the electroluminescent screen when the shutter assembly is activated, and then deactivated, and when the emitter of electromagnetic radiation is deenergized;

measuring a screen current associated with a second image frame which is provided by the electroluminescent screen when the shutter assembly is activated, and then deactivated, following the energizing of the emitter of electromagnetic radiation;

comparing the screen currents associated with the first and second image frames; and

adjusting the duration of time that the emitter of electromagnetic radiation is energized, and the shutter assembly is activated, and then deactivated, based upon a comparison of the screen currents associated with the first and second image frames so as to cause the electroluminescent screen to produce a resulting visibly discernible image.

14. A method as claimed in claim 13, and further comprising:

predicting, in time, the relative movement of the object of interest across a given depth of field;

selectively adjusting the duration that the shutter assembly is activated, and then deactivated, as the object of interest traverses the depth of field so as to continually produce a visibly discernible image.

15. A method as claimed in claim 14, and wherein the step of selectively energizing the emitter of electromagnetic radiation comprises adjusting a frequency, duration, pattern, and/or output intensity of the emitter of electromagnetic radiation when energized.

16. A method as claimed in claim 14, and further comprising:

predicting in time the relative movement of the object of interest across the depth of field and adjusting a time period delay between the energizing of the electromagnetic radiation emitter.

17. A method for adjusting an object detection apparatus comprising:

providing an image intensifier tube having an electroluminescent screen and which produces a screen current when the image intensifier tube processes electromagnetic radiation;

providing a shutter assembly operably coupled to the image intensifier tube and which, when activated, and then deactivated, causes the electroluminescent screen to produce a light output which is converted into an image frame having an associated screen current;

providing an emitter of electromagnetic radiation which is operably coupled to the image intensifier tube, and the shutter assembly, and which, when energized, produces electromagnetic radiation which is directed towards an area of interest; and

measuring the screen current associated with a first image frame when the emitter of electromagnetic radiation is deenergized, and the shutter assembly is activated.

18. A method for adjusting an object detection apparatus comprising:

providing an image intensifier tube having a photoanode, a photocathode, a microchannel plate, and an electroluminescent screen, and which produces a screen current when the image intensifier tube processes electromagnetic radiation;

providing a shutter assembly operably coupled to the image intensifier tube and which, when activated, and then deactivated, causes the electroluminescent screen to produce a light output which comprises an image frame having an associated screen current;

recording the electroluminescent screen current; and

adjusting the voltage potential between the microchannel plate and the photoanode based upon the recorded electroluminescent screen current.

19. A method for adjusting an object detection apparatus, comprising:

providing an image intensifier tube having a photoanode, a photocathode, a microchannel plate, and an electroluminescent screen, and which produces a screen current output when the image intensifier tube processes electromagnetic radiation;

activating the image intensifier tube by switching the voltage between the microchannel plate and the photocathode on and off;

measuring the screen current output produced by the electroluminescent screen when the image intensifier tube is switched on and off; and

adjusting the period of time which the image intensifier tube is energized based upon the screen current output which is measured at the electroluminescent screen.

20. A method for adjusting an object detection apparatus, comprising:

providing an image intensifier tube having an electroluminescent screen, and which produces a screen current output when the image intensifier tube processes electromagnetic radiation;

measuring the screen current output produced by the electroluminescent screen;

providing an emitter of electromagnetic radiation which is electrically coupled with a source of electricity, and which, when periodically energized, produces an electromagnetic radiation output; and

adjusting the intensity of the electromagnetic radiation output of the emitter of electromagnetic radiation based, at least in part, upon the screen current output which is measured at the electroluminescent screen.

21. A method for adjusting an object detection apparatus comprising:

providing an image intensifier tube having an electroluminescent screen and which produces a screen current when the image intensifier tube processes electromagnetic radiation;

providing a shutter assembly operably coupled to the image intensifier tube and which, when activated, and then deactivated, causes the electroluminescent screen to produce a light output which comprises an image frame having an associated screen current;

providing an emitter of electromagnetic radiation which is operably coupled to the image intensifier tube, and the shutter assembly, and which, when energized, produces electromagnetic radiation which is directed towards an area of interest;

measuring the screen current associated with a first image frame when the emitter of electromagnetic radiation is deenergized, and the shutter assembly is activated;

after the step of measuring the screen current associated with a first image frame, energizing the emitter of electromagnetic radiation to direct electromagnetic radiation to the area of interest;

timing the energizing of the emitter of electromagnetic radiation;

activating and deactivating the shutter assembly at a predetermined time after the energizing of the emitter of electromagnetic radiation to capture the electromagnetic radiation reflected from the area of interest, and to produce a second image frame which is associated with a second screen current;

comparing the screen currents associated with the first and second image frames to determine if the screen current associated with the second image frame has a greater magnitude relative to the screen current associated with the first image frame; and

adjusting the duration of time that the emitter of electromagnetic radiation is energized, and the shutter assembly is activated, and then deactivated based upon the comparison of the screen currents associated with the first and second image frames.

22. A method as claimed in claim 21, and wherein when the screen current associated with the second image frame is greater than the screen current associated with the first image frame, the method further comprises:

repeating the steps of activating and deactivating the shutter assembly without energizing the emitter of electromagnetic radiation and then comparing the screen currents associated with the first and second image frames again.

23. A method as claimed in claim 21, and wherein the image intensifier tube produces a visibly discernable image on the electroluminescent screen when the image intensifier tube processes electromagnetic radiation, and wherein the image intensifier tube, when processing excessive amounts of electromagnetic radiation, produces an undiscernable visible image on the electroluminescent screen, and wherein a predetermined threshold amount of screen current is associated with the production of the undiscernable image on the electroluminescent screen, and wherein the method further comprises:

comparing the screen current associated with the second image frame with the predetermined threshold of the screen current associated with the undiscernible image to determine if the screen current associated with the second image frame exceeds the predetermined threshold; and

decreasing the duration that the shutter assembly is activated and then deactivated so as to produce a discernable image on the electroluminescent screen.

24. A method as claimed in claim 23, and wherein the duration that the shutter assembly is activated and then deactivated is reduced so as to produce a subsequent second image frame having a screen current which is a fraction of the predetermined threshold.

25. A method as claimed in claim 23, and wherein the duration that the shutter assembly is activated can be varied so as to produce a second image frame having a screen current which is greater than or equal to the first image frame, but a fraction of the predetermined threshold.

26. A method as claimed in claim 21, and further comprising:

determining the speed of an object within the area of interest and relative to the image intensifier tube based upon the screen current associated with the second image frame.

27. A method as claimed in claim 21, and wherein the electromagnetic radiation reflects from an object traversing a given depth of field relative to the image intensifier tube, and wherein the method further comprises:

predicting, in time, the relative movement of the object of interest within the depth of field; and

adjusting the duration that the shutter assembly is activated based, at least in part, upon the predicted relative movement of the object of interest within the depth of field so as to ensure that a visibly discernable image continues to be produced by the electroluminescent screen as the object of interest traverses the depth of field.

28. A method for adjusting an object detection apparatus, comprising:

providing an image intensifier tube having an electroluminescent screen and which produces a screen current and a light output when the image intensifier tube processes electromagnetic radiation;

providing a shutter assembly which is operably coupled to the image intensifier tube and which, when selectively energized, can be placed in a first, activated condition which allows light to be processed by the image intensifier tube, and a second, deactivated condition, which substantially prevents light from being processed by the image intensifier tube;

providing an emitter of electromagnetic radiation which, when selectively energized, produces pulses of electromagnetic radiation which are directed towards, and reflected from, an object of interest, and which are then received and selectively processed by the image intensifier tube;

providing and positioning an imaging device in light output receiving relation relative to the electroluminescent screen;

providing a controller which is controllably coupled with each of the image intensifier tube, shutter assembly and emitter of electromagnetic radiation, and wherein the controller continually energizes the image intensifier tube, selectively energizes the emitter of electromagnetic radiation, and further activates and deactivates the shutter assembly in a predetermined manner so as to cause the electroluminescent screen to produce a light output which can be converted into an electronic image of the object of interest by the imaging device;

providing an image signal processor which is operably coupled with each of the controller, and the imaging device, and wherein the image signal processor receives the electronic image produced by the imaging device, and produces a visibly discernible composite image output representative of the object of interest;

determining a screen current threshold produced by the electroluminescent screen when the electroluminescent screen is producing an undiscernable image of the object of interest;

selectively energizing the emitter of electromagnetic radiation, continually energizing the image intensifier tube, and activating and deactivating the shutter assembly so as to cause the electroluminescent screen to produce multiple image frames each having an associated screen current;

comparing the respective screen currents of the multiple image frames against the screen current threshold to determine if the screen currents associated with the respective multiple image frames exceed the screen current threshold; and

adjusting the duration that the shutter assembly is activated and then deactivated, so as to cause the electroluminescent screen to produce a light output which can be substantially continually converted into an electronic image of the object of interest by the imaging device.

29. A method as claimed in claim 28, and further comprising:

before the step of decreasing the duration that shutter assembly is activated and then deactivated, predicting, in time, the relative movement of the object of interest within a given depth of field.

30. A method as claimed in claim 28, and wherein the duration that the shutter assembly is activated and then deactivated is reduced so as to produce a subsequent image frame having a screen current which is a fraction of the predetermined screen current threshold.

31. A method as claimed in claim 28, and further comprising:

measuring the screen current provided by the electroluminescent screen when the emitter of electromagnetic radiation is deenergized and the shutter assembly is activated and then deactivated to produce a first image frame;

after the step of measuring the screen current without energizing the emitter of electromagnetic radiation, energizing the emitter of electromagnetic radiation to direct a pulse of electromagnetic radiation at the object of interest;

timing the energizing of the emitter of electromagnetic radiation; and

activating and deactivating the shutter assembly at a predetermined time after the energizing of the emitter of electromagnetic radiation so as to capture electromagnetic radiation which is reflected from the object of interest and to produce a second image frame having an associated second screen current.

32. A method as claimed in claim 31, and wherein the step of comparing the screen currents of the multiple image frames against the determined screen current threshold, further comprises:

comparing the screen currents of the first and second image frames to determine if the screen current associated with the second image frame is of a greater magnitude than the screen current associated with the first image frame; and

adjusting the duration that the emitter of electromagnetic radiation is energized, and the shutter assembly is activated and then deactivated, based upon the comparison of the screen currents associated with the first and second image frames.

33. A method as claimed in claim 28, and further comprising:

providing an input device coupled in signal transmitting relation relative to the image signal processor and which provides additional information which is useful in fully considering the object of interest.

34. A method as claimed in claim 33, and wherein the input device provides information to the image signal processor, and which is selected from the group comprising outside air temperature;

closing speed of the image intensifier tube relative to the object of interest;

time;

overland speed of the image intensifier tube;

GPS coordinates;

the type of electromagnetic radiation received by the image intensifier tube;

the distance that the object of interest is located from the image intensifier tube;

the size of the object of interest;

the convergence of the image intensifier tube with the object of interest, and the recognized shape of the object of interest, and the wavelengths of electromagnetic radiation which are being processed.

35. A method for adjusting an object detection apparatus, comprising:

a. providing an image intensifier tube having an electroluminescent screen, and which processes electromagnetic radiation so as to produce a light output from the electroluminescent screen, and a screen current associated with the light output;

b. providing an emitter of electromagnetic radiation which, when selectively energized, produces pulses of electromagnetic radiation which are directed at, and reflected from an object of interest;

c. providing a shutter assembly which is operably coupled to the image intensifier tube, and which when selectively activated and deactivated permits the image intensifier tube to receive and then process the pulses of electromagnetic radiation which are reflected from the object of interest and other electromagnetic radiation which is generated by the object of interest;

d. providing a controller which is operably coupled to the image intensifier tube, emitter of electromagnetic radiation and shutter assembly and which continually energizes the image intensifier tube, selectively energizes the emitter of electromagnetic radiation, and further activates and deactivates the shutter assembly;

e. providing an imaging device which is located adjacent to the electroluminescent screen, and which receives the light output of the electroluminescent screen and which converts the light output into an electronic image of the object of interest;

f. determining a threshold screen current produced by the electroluminescent screen and which is associated with the production of an undiscernable electronic image by the imaging device;

g. energizing the image intensifier tube and activating and deactivating the shutter assembly, and then measuring a first screen current produced by the electroluminescent screen;

h. after step g, energizing the image intensifier tube, and the emitter of electromagnetic radiation which produces a pulse of electromagnetic radiation which is directed to, and reflected from, the object of interest, and then activating and deactivating the shutter assembly at a predetermined time, and measuring a second screen current produced by the electroluminescent screen;

i. comparing the first and second screen currents to each other, and to the predetermined threshold screen current;

j. adjusting the duration of time that the emitter of electromagnetic radiation is energized, and the shutter assembly is activated and deactivated based upon the comparison of the respective screen currents; and

k. periodically repeating steps g-j so that a visually discernable electronic image of the object of interest is produced by the imaging device.