Light and particle image intensifier

• US 4,471,378 A
• Filed: 12/31/1979
• Issued: 09/11/1984
• Est. Priority Date: 12/31/1979
• Status: Expired due to Term

• Current Assignee: American Sterilizer Company (Steris Corporation)
• Original Assignee: American Sterilizer Company (Steris Corporation)
• Inventors: Ng, Sing Tai
• Primary Examiner(s): BRITTON, HOWARD W
• Application Number:
  US06/108,681
• Time in Patent Office: 1,716 Days
• Field of Search: 358/110, 358/111, 358/113, 358/209, 358/211, 358/213, 358/217, 313/377
• US Class Current: 348/162
• CPC Class Codes: G01T 1/1645 using electron optical imaging means, e.g. image intensifier tubes, coordinate photomultiplier tubes, image converter
• CPC Class Codes: H01J 31/08 having a screen on or from which an image or pattern is formed, picked up, converted, or stored
• CPC Class Codes: H01L 31/119 characterised by field-effect operation, e.g. MIS type detectors

Abstract

A light and charged particle image intensifier receives incident image conveying light or charged particles ("incident beam") and provides to data processing and video equipment signals from which the image conveyed by the incident beam can be constructed and displayed. The beam that is being processed includes visible light reflected from objects and X-ray radiation that has been passed through an object such as a human body. The image intensifier includes a scintillator and photocathode unit for converting the incident beam to photoelectrons and a charge-coupled device ("CCD") for detecting the photoelectrons and transmitting to the data processing and video equipment information relating to the quantity or energy level as well as the location of the electrons impinging on the sensing areas of the CCD. From this information, the data processing and video equipment can reconstruct the image conveyed by the incident beam. The sensitivity of the device is increased either by imposing an electric field across the photocathode and the CCD to accelerate the photoelectrons or by placing a micro channel plate ("MCP") between the photocathode and the CCD to increase the number of electrons that impinge on the CCD. Alternately, a silicon diode target can be used instead of a CCD to intercept the electrons and an electron beam gun can be used to detect the location and intensity of the charges created on the target by the impinging electrons. Finally, a grid having a number of windows can be used instead of a CCD or a silicon target to detect the location of the electron streams and a photoanode can detect their intensity.

Claims

1. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a scintillator screen for intercepting said beam and for emitting photons as a response to the particles of said beam impacting said screen;

a photocathode for intercepting said emitted photons and emitting photoelectrons in response to the impact of said emitted photons on said photocathode;

a charge-coupled device, said photocathode being disposed between said scintillator screen and said charge-coupled device, said charge-coupled device intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a plurality of sensing areas for intercepting and detecting said photoelectrons;

a pluality of storage areas for accepting from said sensing areas informatin relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

storage areas including means for allowing said storage areas to receive analog electrical signals from a source other than said sensing areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

readout means for reading said information from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectrons; and

means for accelerating said photoelectrons toward said charge-coupled device.

2. The image intensifier claimed in claim 1 wherein said analog electrical signal source is said register areas.

3. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a scintillator screen for intercepting said beam and for emitting photons as a response to the particles of said beam impacting said screen;

a photocathode for intercepting said emitted photons and emitting photoelectrons in response to the impact of said emitted photons on said photocathode;

a charge-coupled device, said photocathode being disposed between said scintillator screen and said charge-coupled device, said charge coupled device intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a pluraltiy of sensing areas for intercepting and detecting said photoelectrons;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

said storage areas including means for allowing said information to pass from said storage areas to said register areas nondestructively;

readout means for reading said information from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectons; and

means for accelerating said photoelectrons toward said charge-coupled device.

4. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a scintillator screen for intercepting said beam and for emitting photons as a response to the particles of said beam impacting said screen;

a photocathode for intercepting said emitted photons and emitting photoelectrons in response to the impact of said emitted photons on said photocathode;

a charge-coupled device, said photocathode being disposed between said scintillator screen and said charge-coupled device, said charge-coupled device intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons;

means for accelerating said photoelectrons toward said charge-coupled device; and

a phosphor screen disposed between said photocathode and said charge-coupled device for emitting secondary photons as a response to said photoelectrons impacting said phosphor screen.

5. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a scintillator screen for intercepting said beam and for emitting photons as a response to the particles of said beam impacting said screen;

a photocathode for intercepting said emitted photons and emitting photoelectrons in response to the impact of said emitted photons on said photocathode;

a charge-coupled device, said photocathode being disposed between said scintillator screen and said charge-coupled device, said charge-coupled device intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a plurality of sensing areas for intercepting and detecting said photelectrons;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

readout means for reading said information from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectrons;

a micro channel plate disposed between said photocathode and said charge-coupled device for receiving said photoelectrons and emitting toward said charge-coupled device secondary electrons, the quantity of said secondary electrons being greater than the quantity of said photoelectrons;

means for accelerating said secondary electrons toward said charge-coupled device; and

means for accelerating said photoelectrons toward said charge-coupled device.

6. The image intensifier claimed in claim 5, wherein said means for accelerating said secondary electrons is an electric field.

7. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a scintillator screen for intercepting said beam and for emitting photons as a response to the particles of said beam impacting said scintillator screen;

a photocathode for intercepting said emitted photons and emitting photoelectrons in response to the impact of said emitted photons on said photocathode;

a micro channel plate for emitting secondary electrons in response to the reception of photoelectrons by said micro channel plate, the quantity of said secondary electrons being greater than the quantity of said photoelectrons;

means for detecting the presence, intensity and location of said secondary electrons, said microchannel plate being disposed between said photocathode and said detection means, said means transmitting information relating to said presence, location and intensity to said data processing and video equipment;

means for accelerating said photoelectrons toward said micro channel plate; and

,

means for accelerating said secondary electrons toward said detection means.

8. The image intensifier claimed in claim 7 wherein said detection means comprises:

a silicon diode target, said secondary electrons creating a charge in said target where said secondary electrons strike said target;

an electron beam gun, said target being disposed between said micro channel plate and said electron beam gun, said electron beam gun scanning said target and passing information relating to the presence, location and intensity of said charges to said data processing and video equipment, and an electric field imposed across said target and said gun.

9. The image intensifier claimd in claim 7 wherein said incident beam comprises X-ray radiation.

10. The imge intensifier claimed in claim 7 wherein said incident beam comprises gamma-ray radiation.

11. The image intensifier claimed in claim 7 wherein said incident beam comprises atomic particles.

12. The image intensifier claimed in claim 7 wherein said incident beam comprises infra-red light.

13. The image intensifier claimed in claim 7 wherein said incident beam comprises ultraviolet light.

14. The image intensifier claimed in claim 7 wherein said detection means comprises:

a photoanode;

a scanning grid for scanning said secondary electrons by selectively and systematically allowing a portion of said secondary electrons to pass through said grid, said scanning grid being disposed between said micro channel plate and said photoanode;

said photoanode passing to said data processing and video equipment information relating to the presence, location and energy level of said secondary electrons; and

,

means for accelerating said passed secondary electrons toward said photoanode.

15. The image intensifier claimed in claim 14 wherein said means for accelerating said passed electrons is an electric field.

16. A visible light image intensifier for processing a visible light beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the photons of said beam on said photocathode;

a charge-coupled device for intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a plurality of sensing areas is intercepting and detecting said photoelectrons;

a pluraltiy of storage areas for accepting from said sensing areas information relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

said storage areas including means for allowing said storage areas to receive electrical signals from a source other than said sensing areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

readout means for reading said information from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectrons; and

means for accelerating said photoelectrons toward said charge-coupled device.

17. The visible light image intensifier claimed in claim 16 wherein said electrical signal source is said register areas.

18. A visible light image intensifier for processing a visible light beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the photons of said beam on said photocathode;

a charge-coupled device for intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a plurality of sensing areas for intercepting and detecting said photoelectrons;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

said storage areas including means for allowing said information to pass from said storage areas to said register areas nondestructively;

readout means for reading said informaton from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectrons; and

means for accelerating said photoelectrons toward said charge-coupled device.

19. A visible light image intensifier for processing a visible light beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the photons of said beam on said photocathode;

a charge-coupled device for intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons;

means for accelerating said photoelectrons toward said charge-coupled device; and

a phosphor screen disposed between said photocathode and said charge-coupled device for emitting secondary photons as a response to said photoelectrons impacting said phosphor screen.

20. A visible light image intensifier for processing a visible light beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the photons of said beam on said photocathode;

a charge-coupled device for intercepting and detecting said photoelectrons and transmitting to said data processing and video equipment information relating to the presence and location of said photoelectrons, said charge-coupled device including;

a plurality of sensing areas for intercepting and detecting said photoelectrons;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said photoelectrons;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

readout means for reading said information from said register areas; and

shielding means covering said storage and register areas for protecting said storage and register areas from said photoelectrons;

a micro channel plate disposed between said photocathode and said charge-coupled device for receiving said photoelectrons and emitting toward said charge-coupled device secondary electrons, the quantity of said secondary electrons being greater than the quantity of said photoelectrons;

means for accelerating said secondary electrons toward said charge-coupled device; and

means for accelerating said photoelectrons toward said charge-coupled device.

21. The visible light image intensifier claimed in claim 20 wherein said means for accelerating said secondary electrons is an electric field.

22. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the particles of said beam on said photocathode;

a micro channel plate for emitting secondary electrons in response to the reception of photoelectrons by said micro channel plate, the quantity of said secondary electrons being greater than the quantity of said photoelectrons;

means for detecting the presence, intensity and location of said secondary electrons and for transmitting information relating to said presence, location and intensity to said data processing and video equipment, said detection means including;

a silicon diode target, said secondary electrons creating a charge in said target where said secondary electrons strike said target; and

an electron beam gun, said target being disposed between said micro channel plate and said electron beam gun, said electron beam gun scanning said target and passing information relating to the presence, location and intesity of said charges to said data processing and video equipment, and an electric field imposed across said target and said gun;

means for accelerating said photoelectrons toward said micro channel plate;

means for accelerating said secondary electrons toward said detection means.

23. An image intensifier for processing a beam and providing to data processing and video equipment information needed by said equipment to construct and display the image conveyed by said beam, said image intensifier comprising:

a photocathode for intercepting said beam and emitting photoelectrons in response to the impact of the particles of said beam on said photocathode;

a micro channel plate for emitting secondary electrons in response to the reception of photoelectrons by said micro channel plate, the quantity of said secondary electrons being greater than the quantity of said photoelectrons;

means for detecting the presence, intensity and location of said secondary electrons and for transmitting information relating to said presence, location and intensity to said data processing and video equipment, said detection means including;

a photoanode;

a scanning grid for scanning said secondary electrons by selectively and systematically allowing a portion of said secondary electrons to pass through said grid, said scanning grid being disposed between said micro channel plate and said photoanode;

said photoanode passing to said data processing and video equipment information relating the presence, location and energy level of said secondary electrons; and

means for accelerating said passed secondary electrons toward said photoanode;

means for accelerating said photoelectrons toward said micro channel plate; and

means for accelerating said secondary electrons toward said detection means.

24. The image intensifier claimed in claim 23 wherein said means for accelerating said passed electrons is an electric field.

25. A charge-coupled device for detecting particles and conveying to data processing and video equipment data necessary to permit said equipment to reconstruct and display an image conveyed by said particles, said charge-coupled device comprising:

a plurality of sensing areas for intercepting and detecting said particles;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said particles;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

readout means for reading said information from said register areas; and

means for shielding said register and storage areas from atomic particles.

26. The charge-coupled device claimed in claim 25 wherein said storage areas include means for allowing said storage areas to receive electrical signals from a source other than said sensing areas.

27. The charge-coupled device claimed in claim 26 wherein said electrical signal source is said register areas.

28. A charge-coupled device for detecting particles and conveying to data processing and video equipment data necessary to permit said equipment to reconstruct and display an image conveyed by said particles, said charge-coupled device comprising:

a plurality of sensing areas for intercepting and detecting said particles;

a plurality of storage areas for accepting from said sensing areas information relating to the location and presence of said particles;

sensor to storage transfer means for transferring said information from said sensing areas to said storage areas;

a plurality of register areas for receiving said information from said storage areas and for transferring said information to said data processing and video equipment;

storage to register transfer means for transferring said information from said storage areas to said register areas;

said storage areas including means for allowing said information to pass from said storage areas to said register areas nondestructively; and

readout means for reading said information from said register areas.