US 4,471,378 A · Light and particle image intensifier

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.

Claims28

Dependent claims

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.

11 more elements

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.

12 more elements

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.

4 more elements

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.

11 more elements

Dependencies are inferred from the claim text.

Light and particle image intensifier

Life of this patent

Light and particle image intensifier

Life of this patent

Abstract

Claims28