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Photomultiplier tube

A technology of photomultiplier tube and electron multiplication, which is applied in the direction of dynode, detailed information of electron multiplier, cathode device of electron multiplier, etc. It can solve the problems of moving time difference, response time fluctuation, output signal difficult to obtain time resolution, etc., to achieve The effect of increasing temporal resolution

Active Publication Date: 2007-01-24
HAMAMATSU PHOTONICS KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, due to the incident position of light in the cathode 3, a photoelectron movement time difference (CTTD: Cathode Transit Time Difference, cathode movement time difference) is generated, resulting in fluctuations in the response time of the output signal to the incident light, and it is difficult to obtain enough in the output signal. Time resolution

Method used

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Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0038] figure 1 is a longitudinal sectional view of the photomultiplier tube according to the first embodiment of the present invention along the direction perpendicular to the longitudinal direction of the dynode, in figure 2 Among them, (a) is figure 1 The end view of the photomultiplier tube along the length direction of the dynode, (b) is viewed from the left side of the figure figure 1 End view of a photomultiplier tube. This photomultiplier tube is what is called an end window type photomultiplier tube, and is a device for detecting light incident from an end surface. Hereinafter, the "upstream side" refers to the end surface side where light is incident, and the "downstream side" refers to the opposite side.

[0039] exist figure 1Among them, the airtight container 1 is a light-transmitting airtight container, specifically, a transparent cylindrical glass tube whose both ends on the upstream side and the downstream side are closed. Inside the airtight containe...

no. 2 Embodiment approach

[0050] The photomultiplier tube of the second embodiment will be described below. Moreover, the same code|symbol is attached|subjected to the same or equivalent structural part as 1st Embodiment, and the description is abbreviate|omitted.

[0051] Figure 4 It is a longitudinal cross-sectional view of the photomultiplier tube according to the second embodiment along the direction perpendicular to the longitudinal direction of the dynode. Such as Figure 4 As shown, the second dynode 107b is provided in a state where the sidewalls at both edges are removed.

[0052] The electron lens forming electrode 215 is provided substantially parallel to the side wall 111 a between the side wall 111 a of the first dynode and the edge portion of the second dynode 107 b. In addition, an electron lens forming electrode is also provided on the other edge side, but since it has the same structure as the electron lens forming electrode 215 , description thereof will be omitted. Like the elec...

no. 3 Embodiment approach

[0055] The photomultiplier tube of the third embodiment will be described below. Moreover, the same code|symbol is attached|subjected to the same or equivalent structural part as 1st Embodiment, and the description is abbreviate|omitted.

[0056] Figure 5 It is a longitudinal cross-sectional view of the photomultiplier tube according to the third embodiment along the direction perpendicular to the longitudinal direction of the dynode. Such as Figure 5 As shown, the second dynode 107b and the third dynode 107c are provided in a state where the side walls of both edge portions are removed.

[0057] The electron lens forming electrode 315 is provided substantially parallel to the side wall 111 a between the side wall 111 a of the first dynode and the edge portion of the third dynode 107 c. The position and shape of the electron lens forming electrode 315 are almost the same as those of the electron lens forming electrode 115, but the electron lens forming electrode 315 is fo...

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Abstract

The photomultiplier tube has: a cathode (3) that releases electrons by incident light; a multistage dynode (107) that multiplies the electrons released from the cathode (3); and an electron lens forming electrode (115), which Arranged at a predetermined position relative to the edge of the first dynode (107a) and the edge of the second dynode (107b), wherein the first dynode (107a) is located at the first stage from the cathode (3) , the second dynode (107b) is located at the second level from the cathode (3), and in the length direction of the first dynode (107a), the distance between the first dynode (107a) and the second dynode (107b) The equipotential surface in the space between is flattened. With this structure, the time resolution with respect to incident light can be improved.

Description

technical field [0001] The present invention relates to a photomultiplier tube for multiplying photoelectrons generated corresponding to incident light. Background technique [0002] Photomultiplier tubes are widely used in many fields as light sensors utilizing the photoelectric effect. When light is incident into the photomultiplier tube from the outside, the light passes through the glass tube and hits the photoelectric surface, releasing photoelectrons from the photoelectric surface. The released photoelectrons are multiplied by sequentially incident on the multi-level dynodes, and the multiplied photoelectrons are collected by the anode as output signals. External light incident on the photomultiplier tube is detected by measuring this output signal (for example, refer to Patent Documents 1 to 3). [0003] Patent Document 1: Japanese Patent Publication No. 43-443 [0004] Patent Document 2: Japanese Patent Application Laid-Open No. 5-114384 [0005] Patent Document ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J43/26H01J43/20H01J43/06H01J43/08
CPCH01J43/08
Inventor 大村孝幸木村末则伊藤益保
Owner HAMAMATSU PHOTONICS KK
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