EP0956581A1 - Tube photomultiplicateur de longueur reduite - Google Patents
Tube photomultiplicateur de longueur reduiteInfo
- Publication number
- EP0956581A1 EP0956581A1 EP98900630A EP98900630A EP0956581A1 EP 0956581 A1 EP0956581 A1 EP 0956581A1 EP 98900630 A EP98900630 A EP 98900630A EP 98900630 A EP98900630 A EP 98900630A EP 0956581 A1 EP0956581 A1 EP 0956581A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dynode
- dynodes
- intended
- tube
- rajkman
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/04—Electron multipliers
- H01J43/06—Electrode arrangements
Definitions
- the present invention relates to a photomultiplier tube comprising:
- a photocathode intended to be placed at a first electrical potential and having a semi-transparent photo-sensitive layer intended to receive from the outside of the tube an illumination and to emit towards the inside of the tube a flow of electrons whose density depends of the intensity of the illumination received by the photocathode
- a focusing optic comprising a first dynode intended to be brought to a second electrical potential whose value is greater than that of the first, having a so-called re-emitting surface made of a material promoting the phenomena of secondary emission, which surface is concave on the photocathode side, and
- a plurality of Rajkman dynodes arranged on either side of a plane called the plane of the dynodes, dynodes the first of which is closest to the output of the focusing optics and is intended to be brought to a third electrical potential of which the value is greater than that of the second, each of the following dynodes being intended to be brought to an electrical potential whose value is greater than that of the potential of the dynode which precedes it, plurality of dynodes which is intended to receive and to amplify the flow of electrons from the focusing optics.
- the plane of the dynodes is parallel to the axis of the tube.
- the dimension of the tube along this axis called the length of the tube, is therefore important. This can be prohibitive in many applications, for example when the tube is used within a gamma camera for detecting radiation, it is desired to have tubes of reduced length in order to reduce the size of the device in which they are integrated.
- the invention aims to remedy this drawback by proposing a photomultiplier tube in which the plane of the dynodes is not parallel to the axis of the tube.
- a photomultiplier tube as described in the introductory paragraph is characterized according to the present invention in that the focusing optics further comprises a second dynode intended to be brought to a potential whose value is intermediate between those of the second and third potentials, the second dynode having a concave re-emitting surface on the side of the re-emitting surface of the first dynode, and in that the plane of the dynodes presents with respect to the axis of the tube , defined as an axis which is perpendicular to the photocathode in the middle, an angle greater than 45 °, the concavity of the first Rajkman dynode being directed towards the re-emitting surface of the second dynode.
- the overall dimensions, considered lengthwise, due to the succession of Rajkman dynodes is all the more reduced the greater the angle between the plane of the dynodes and the axis of the tube.
- the second dynode allows to re-direct the flow of electrons from the first dynode to the first Rajkman dynode.
- the second dynode can advantageously be provided with a conductive grid placed across the path followed by the flow of electrons between the first and the second dynode, which grid is then brought to a potential close to that of the second dynode.
- the plane of the dynodes has an angle in the region of 90 ° relative to the axis of the tube.
- Such a configuration allows a maximum reduction of the influence of the succession of Rajkman dynodes on the total length of the tube.
- a photomultiplier tube as described above is characterized in that it comprises a grid, disposed between the second dynode and the first Rajkman dynode, and intended to be brought to a electrical potential close to that to which the second Rajkman dynode is carried.
- the presence of the grid makes it possible to increase the collection efficiency at the level of the first Rajkman dynode, that is to say the ratio between the number of electrons received by said dynode and the number of electrons emitted. by the second dynode.
- the grid locally generates an electric field substantially parallel to the path between the second dynode and the first Rajkman dynode, which accelerates the electrons in its vicinity and directs them towards the first Rajkman dynode.
- FIG. 1 schematically represents a sectional view of a photomultiplier tube according to the invention.
- the cutting plane is parallel to a TAX axis, called the axis of the tube, and perpendicular to a plane called the plane of the dynodes, the intersection of which with the cutting plane is represented here by an axis DP.
- the photomultiplier tube has an envelope outer glass TU, which may for example have a symmetry of revolution with respect to the axis of the tube TU and one face of which, perpendicular to the axis of the tube TAX, carries a photocathode PK intended to be placed at a first electrical potential and having a semi-transparent photo-sensitive layer.
- This photomultiplier tube further comprises a focusing optic comprising a first dlode Dl intended to be brought to a second electrical potential whose value is greater than that of the first, having a so-called re-emitting surface made of a material promoting the phenomena of secondary emission, which surface is concave on the side of the PK photocathode.
- the focusing optic furthermore comprises a second dynode D2 intended to be brought to a potential whose value is greater than that of the second potential, and having a concave re-emitting surface on the side of the re-emitting surface of the first dl dynode .
- the photomultiplier tube also includes a plurality of Rajkman dynodes D3, ...
- D8 intended to receive and amplify the flow of electrons coming from the focusing optics, and arranged on either side of the plane of the dynodes, dynodes the first of which, D3, is closest to the second dynode D2 and is intended to be brought to a third electrical potential whose value is greater than that of the potential of the second dynode D2.
- the concavity of the first dynode of Rajkman D3 is directed towards the re-emitting surface of the second dynode D2.
- Each of the following dynodes D4, ... D8 is intended to be brought to an electrical potential whose value is greater than that of the potential of the dynode which precedes it.
- the axis DP has an angle jS close to 90 ° relative to the axis of the TAX tube.
- the photomultiplier tube finally comprises a grid Gd, for example made up of conductive bars, and disposed between the second dynode D2 and the first Rajkman D3 dynode, and intended to be brought to an electrical potential close to that to which the second dynode of Rajkman D4.
- the first Dl dynode re-emits, thanks to the secondary emission phenomena well known to the specialist, a greater number of electrons than the number of electrons collected, and thus achieves a first amplification of the density of the electron flow.
- the electrons re-emitted by the first D1 dynode are collected by the second D2 dynode, due to the potential difference existing between the second dynode D2 and the first dynode Dl which creates an electric field directed from the second dynode D2 to the first dynode Dl.
- the electrons re-emitted by the second dynode D2 are accelerated by the electric field prevailing locally around the grid Gd, which makes it possible to direct them towards the first dynode of Rajkman D3, which thus presents a great collection efficiency.
- the electron flow is subjected to successive amplifications carried out by the Rajkman dynodes according to a process known to those skilled in the art which it is unnecessary to develop here, before arriving at an AN anode which constitutes the output of the tube and restores electronic information representative of the illumination received by the PK photocathode.
- the structure of the focusing optics D1, D2 therefore makes it possible to re-direct the flow of electrons towards the first Rajkman dynode when the plane of the dynodes has a significant angle relative to the axis of the TAX tube.
- the usefulness of this arrangement is clearly visible in this example, where the angle ⁇ is close to 90 °, which makes it possible to reduce the overall dimensions due to the succession of Rajkman dynodes D3, ... D8, and so the total length of the tube.
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Electron Tubes For Measurement (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9700898 | 1997-01-28 | ||
FR9700898 | 1997-01-28 | ||
PCT/IB1998/000097 WO1998033202A1 (fr) | 1997-01-28 | 1998-01-26 | Tube photomultiplicateur de longueur reduite |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0956581A1 true EP0956581A1 (fr) | 1999-11-17 |
EP0956581B1 EP0956581B1 (fr) | 2003-12-03 |
Family
ID=9503047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98900630A Expired - Lifetime EP0956581B1 (fr) | 1997-01-28 | 1998-01-26 | Tube photomultiplicateur de longueur reduite |
Country Status (6)
Country | Link |
---|---|
US (1) | US6232715B1 (fr) |
EP (1) | EP0956581B1 (fr) |
JP (1) | JP2001508917A (fr) |
DE (1) | DE69820228T2 (fr) |
DK (1) | DK0956581T3 (fr) |
WO (1) | WO1998033202A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0898296A2 (fr) * | 1997-08-21 | 1999-02-24 | Burle Industries, Inc. | Tube photomultiplicateur court pour gamma camera |
WO2007005004A1 (fr) | 2005-06-30 | 2007-01-11 | Datacard Corporation | Mecanisme de feuilletage de page |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4640881B2 (ja) | 2000-07-27 | 2011-03-02 | 浜松ホトニクス株式会社 | 光電子増倍管 |
US7492097B2 (en) | 2005-01-25 | 2009-02-17 | Hamamatsu Photonics K.K. | Electron multiplier unit including first and second support members and photomultiplier including the same |
CN110828276B (zh) * | 2019-11-19 | 2022-02-11 | 金陵科技学院 | 一种拥有混合电子倍增系统的大面积光电倍增管 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4575657A (en) * | 1984-05-18 | 1986-03-11 | Rca Corporation | Photomultiplier tube having an improved centering and cathode contacting structure |
JPH04315758A (ja) * | 1991-01-14 | 1992-11-06 | Hamamatsu Photonics Kk | 光電子増倍管 |
DE69404079T2 (de) * | 1993-04-28 | 1997-11-06 | Hamamatsu Photonics Kk | Photovervielfacher |
JPH07245078A (ja) * | 1994-03-07 | 1995-09-19 | Hamamatsu Photonics Kk | 光電子増倍管 |
US5914561A (en) * | 1997-08-21 | 1999-06-22 | Burle Technologies, Inc. | Shortened profile photomultiplier tube with focusing electrode |
-
1998
- 1998-01-26 WO PCT/IB1998/000097 patent/WO1998033202A1/fr active IP Right Grant
- 1998-01-26 EP EP98900630A patent/EP0956581B1/fr not_active Expired - Lifetime
- 1998-01-26 JP JP52921298A patent/JP2001508917A/ja active Pending
- 1998-01-26 US US09/341,701 patent/US6232715B1/en not_active Expired - Lifetime
- 1998-01-26 DE DE69820228T patent/DE69820228T2/de not_active Expired - Fee Related
- 1998-01-26 DK DK98900630T patent/DK0956581T3/da active
Non-Patent Citations (1)
Title |
---|
See references of WO9833202A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0898296A2 (fr) * | 1997-08-21 | 1999-02-24 | Burle Industries, Inc. | Tube photomultiplicateur court pour gamma camera |
EP0898296B1 (fr) * | 1997-08-21 | 2003-02-19 | Burle Technologies, Inc. | Tube photomultiplicateur court pour gamma camera |
WO2007005004A1 (fr) | 2005-06-30 | 2007-01-11 | Datacard Corporation | Mecanisme de feuilletage de page |
Also Published As
Publication number | Publication date |
---|---|
JP2001508917A (ja) | 2001-07-03 |
US6232715B1 (en) | 2001-05-15 |
WO1998033202A1 (fr) | 1998-07-30 |
DE69820228T2 (de) | 2004-11-25 |
EP0956581B1 (fr) | 2003-12-03 |
DK0956581T3 (da) | 2004-04-05 |
DE69820228D1 (de) | 2004-01-15 |
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