High quantum efficiency microchannel plate photomultiplier tube, double alkali photocathode and preparation method

A technology of photomultiplier tube and photocathode, which is applied in the field of photodetection and can solve the problems of poor repeatability of photocathode

Active Publication Date: 2018-10-30
NORTH NIGHT VISION TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a microchannel plate-type photomultiplier tube with high quantum efficiency, a double-alkali photocathode and a preparation method for solving the poor repeatability of the existing photocathode question

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  • High quantum efficiency microchannel plate photomultiplier tube, double alkali photocathode and preparation method
  • High quantum efficiency microchannel plate photomultiplier tube, double alkali photocathode and preparation method
  • High quantum efficiency microchannel plate photomultiplier tube, double alkali photocathode and preparation method

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] A microchannel plate type photomultiplier tube, the basic composition of which is:

[0051] a light-transmitting glass vacuum container, the interior of which is in a vacuum state, and the double-alkali photocathode is covered on the inner surface of the upper hemisphere of the glass vacuum container;

[0052] A reflective film placed on the inner surface of the lower hemisphere of the glass vacuum container;

[0053] a focusing electrode placed in the glass vacuum container at a lower center position and used to collect electrons generated by the dual alkali photocathode;

[0054] a microchannel plate-type electron dynode placed at the rear end of the focusing electrode for generating proliferating electrons;

[0055] A supply electrode placed at the tail of the glass vacuum container and used to supply power to the dual-alkali photocathode, the focusing elec...

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Abstract

The invention discloses a micro-channel plate type photomultiplier tube with high quantum efficiency and a preparation method thereof, and a dual-alkali photocathode and a preparation method thereof.Obtained dual-alkali photocathodes are sequentially stacked on the substrate in a multi-layer alkali antimonide manner; and the components of the alkali antimonide change based on a rule that antimonyelements decrease gradually and alkali metal increases gradually in a direction from the substrate of the dual-alkali photocathode to the outer surface. Therefore, the obtained stable dual-alkali photocathode structure has high repeatability; and a self-built electric field is formed inside the dual-alkali photocathode, so that electrons are excited in vacuum and thus the obtained micro-channel plate type photomultiplier tube has the high quantum efficiency.

Description

technical field [0001] The invention relates to the field of photoelectric detection, in particular to a photomultiplier tube. Background technique [0002] Photomultiplier tubes are vacuum electronic devices that convert weak optical signals into electrical signals and multiply and amplify the electrical signals. They can effectively detect extremely weak light and can be widely used in extremely weak light detection, photon detection, chemiluminescence, Bioluminescence and other research fields have the characteristics of high detection efficiency and high time resolution. As a vacuum device, photomultiplier tube mainly includes photocathode, focusing electrode, electron multiplier and other components. The core part of the photomultiplier tube is the photocathode, and its performance directly affects the performance of the entire photomultiplier tube. Its main performance parameter is quantum efficiency (quantum efficiency refers to the number of photoelectrons that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/34H01J40/16H01J43/08H01J9/12C23C14/24C23C14/14
Inventor 金睦淳司曙光张勤东侯巍谢飞钱森刘术林曹宜起丛晓庆邱祥彪
Owner NORTH NIGHT VISION TECH
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