EP0033894A1 - Intensificateur à vide d'images aux rayons X à plusieurs étages - Google Patents

Intensificateur à vide d'images aux rayons X à plusieurs étages Download PDF

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Publication number
EP0033894A1
EP0033894A1 EP81100574A EP81100574A EP0033894A1 EP 0033894 A1 EP0033894 A1 EP 0033894A1 EP 81100574 A EP81100574 A EP 81100574A EP 81100574 A EP81100574 A EP 81100574A EP 0033894 A1 EP0033894 A1 EP 0033894A1
Authority
EP
European Patent Office
Prior art keywords
screen
layer
photocathode
image
image intensifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81100574A
Other languages
German (de)
English (en)
Other versions
EP0033894B1 (fr
Inventor
Ulrich Kröner
Walter Dipl.-Phys. Greschat
Peter Römer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0033894A1 publication Critical patent/EP0033894A1/fr
Application granted granted Critical
Publication of EP0033894B1 publication Critical patent/EP0033894B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H01J31/508—Multistage converters

Definitions

  • the invention relates to multi-stage X-ray image intensifier (RBV) according to the preamble of claim 1.
  • RBV X-ray image intensifier
  • Such image intensifiers are known, for example, from US Pat. No. 2,555,423.
  • the individual stages which amplify the electron image by acceleration in the electric field, are coupled to one another via screens, the essential elements of which are a luminescent layer and an optical one with it Have contact standing photocathode layer.
  • These two reactive layers usually have little strength in themselves. They are therefore attached to both sides of a sufficiently stable support plate which allows the light released in the luminescent layer to pass through to the photocathode layer on the other side.
  • the support must be designed so that there is a good "contact copy" of the fluorescent screen image on the photocathode, i.e. that the support does not reduce the sharpness of the image. This is e.g. achievable through the use of fiber optic plates as supports for the layers. But they have the main disadvantage that they are very expensive.
  • the thickness of the carrier layer must not cause any significant scattering of the light passing through. For the image sharpness that can generally be used in RBV, for example, up to 50 / um would still be permissible.
  • the phosphor layer is first applied to the carrier. This is followed by installation in the image intensifier arrangement and finally the application of the photocathode layer to the still free surface of the support opposite the luminous layer.
  • the invention has for its object to provide a coupling screen in image intensifiers according to the preamble of claim 1, which results in flawless images and is still inexpensive and easy to manufacture. This object is achieved by the measures specified in the characterizing part of claim 1.
  • the subjects of the subclaims relate to advantageous developments of the invention.
  • the invention is based on the fact that a clean base for the photocathode can also be obtained by applying a clean assignment before the photocathode is applied.
  • it has proven to be expedient to provide base areas on both the input screen and the intermediate screen, which are of the same type and at the same time form a barrier against influences from the base. Care should be taken, however, that the application on the base of the coupling screen should be thin in order to keep the loss of light and sharpness low, i.e. so that the light passing from the screen into the photocathode is not unduly absorbed and scattered.
  • a method which has proved to be advantageous is that the "contaminated" surface before the coating with the photo-cathode with a layer of CsI. Na is occupied, the 5 to 10 / is to thick, it is a very clean Get a pad for the photo cathode.
  • both the entrance screen and the intermediate screen (s) are given surfaces of the same material, ie the same substrate is produced. This makes it possible to manufacture the photocathodes in the same or a similar process. In this way, cathodes of the same cesium saturation can be obtained. In earlier methods, cathode oversaturation could occur due to different formation rates occurring on different substrates.
  • an antimony (Sb) source In the invention, one can get by with an antimony (Sb) source, whereas in the known production a special Sb source was required for each photo-cathode because of the necessary adaptation to the substrate. If water-soluble cesium iodide is used as the material of the additional layer, the cathode material can simply be rinsed off with water together with the background vapor deposition.
  • Sb antimony
  • the technology according to the invention can also be used with advantage where subsequent cleaning of the base of the photocathode itself would be possible.
  • Through the Intermediate layer according to the invention can generally be achieved in addition to the advantages specified above, because the cleaning step can be dispensed with (cleaning, polishing, etc.).
  • 1 denotes a vacuum-tight bulb, which carries on its one end wall 2 in the interior of the bulb a luminous layer 3, on which a photocathode layer 4 follows.
  • an electron-sensitive fluorescent screen which consists of an electron permeable, light reflecting cover 5 made of aluminum and a light-emitting layer 6. This rests on a support 7 which consists of mica and 50 / is thick.
  • the carrier 7 is provided with a coating 8 made of cesium iodide, which is 8 / um thick.
  • a photocathode layer 9 which corresponds to layer 4 is applied to layer 8.
  • the luminescent screen combination lying on the output side 10 opposite the input side 2, like that designated in the intermediate screen with 5 and 6, consists of a cover 11 made of aluminum and a luminescent layer 12.
  • a voltage of 15 kV is applied between the photocathode 4 and the aluminum layer 5 for close focusing and acceleration from a direct current source 13.
  • a voltage of 20 kV from a source 14 is applied between the photocathode layer 9 and the aluminum cover 11.
  • a beam of rays 17 coming from an X-ray tube 16 is directed onto a body 18 from a device 15 for generating X-rays.
  • the rays from the bundle 17 come through the input window 2 onto the fluorescent screen 3, where they generate light which acts on the photocathode 4 and triggers electrons there. These are then accelerated as indicated by dotted lines 19 onto the fluorescent screen consisting of 5 and 6.
  • the electrons trigger light again in the sense of the desired imaging and amplification 19, which acts on the photocathode 9 through the support 7 and the coating 8 and there again triggers an electron beam 20, which then emits light in the fluorescent screen consisting of 11 and 12 triggers that, as indicated by arrows 21, can be observed from the outside.
EP81100574A 1980-02-06 1981-01-27 Intensificateur à vide d'images aux rayons X à plusieurs étages Expired EP0033894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3004351 1980-02-06
DE19803004351 DE3004351A1 (de) 1980-02-06 1980-02-06 Mehrstufiger vakuum-roentgenbildverstaerker

Publications (2)

Publication Number Publication Date
EP0033894A1 true EP0033894A1 (fr) 1981-08-19
EP0033894B1 EP0033894B1 (fr) 1984-05-30

Family

ID=6093905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100574A Expired EP0033894B1 (fr) 1980-02-06 1981-01-27 Intensificateur à vide d'images aux rayons X à plusieurs étages

Country Status (4)

Country Link
US (1) US4362933A (fr)
EP (1) EP0033894B1 (fr)
JP (1) JPS5843859B2 (fr)
DE (2) DE3004351A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4594566A (en) * 1984-08-30 1986-06-10 Advanced Nmr Systems, Inc. High frequency rf coil for NMR device
US4730106A (en) * 1986-12-04 1988-03-08 United States Department Of Energy Optical fiducial timing system for X-ray streak cameras with aluminum coated optical fiber ends
US4912737A (en) * 1987-10-30 1990-03-27 Hamamatsu Photonics K.K. X-ray image observing device
US5013902A (en) * 1989-08-18 1991-05-07 Allard Edward F Microdischarge image converter
CN109686640A (zh) * 2019-01-18 2019-04-26 茆占湖 一种平板倍增影像增强器及倍增方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851625A (en) * 1952-10-30 1958-09-09 Rca Corp Image tube

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2555423A (en) * 1947-04-16 1951-06-05 Sheldon Edward Emanuel Image intensifying tube
FR1474019A (fr) * 1966-01-20 1967-03-24 Electronique & Physique Dispositif d'alimentation pour tube amplificateur d'images à plusieurs étages
NL7215769A (fr) * 1971-11-24 1973-05-28
US3749920A (en) * 1971-12-03 1973-07-31 E Sheldon System for x-ray image intensification
DE2442491C3 (de) * 1974-09-05 1979-10-25 Siemens Ag, 1000 Berlin Und 8000 Muenchen Eingangsschirm für eine Röntgenbildverstärkerröhre
US4039887A (en) * 1975-06-04 1977-08-02 Rca Corporation Electron emitter including porous antimony
US4221967A (en) * 1978-03-10 1980-09-09 Diagnostic Information, Inc. Gamma ray camera

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851625A (en) * 1952-10-30 1958-09-09 Rca Corp Image tube

Also Published As

Publication number Publication date
JPS56123655A (en) 1981-09-28
DE3163788D1 (de) 1984-07-05
DE3004351A1 (de) 1981-08-13
EP0033894B1 (fr) 1984-05-30
JPS5843859B2 (ja) 1983-09-29
US4362933A (en) 1982-12-07

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