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Photocathode with low thermal emission, photomultiplier and preparation method of photocathode with low thermal emission

A photomultiplier tube and photocathode technology, which is applied in the manufacturing of light-emitting cathodes, photo-emission cathodes, detailed information of electron multipliers, etc., can solve the problems of poor noise resistance of photomultiplier tubes, influence of signal accuracy measurement, etc.

Active Publication Date: 2020-06-09
NORTH NIGHT VISION TECH
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Problems solved by technology

However, the noise immunity of photomultiplier tubes is poor, and large noise will affect the accuracy of signal measurement

Method used

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  • Photocathode with low thermal emission, photomultiplier and preparation method of photocathode with low thermal emission
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  • Photocathode with low thermal emission, photomultiplier and preparation method of photocathode with low thermal emission

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Embodiment Construction

[0038] In order to better understand the technical content of the present invention, specific embodiments are given and described below in conjunction with the accompanying drawings.

[0039] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be understood that the various concepts and embodiments described above, as well as those described in greater detail below, can be implemented in any of a number of ways, as the concepts and embodiments disclosed herein do not limited to any implementation. Additionally, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

[0040] figure 1 The illustrated example shows the structure diagram of the low thermal emission photocathode ...

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Abstract

The invention belongs to the technical field of photomultipliers, particularly relates to a photocathode, and discloses a photocathode with low thermal emission, a photomultiplier and a preparation method of the photocathode with low thermal emission. The photocathode with low thermal emission comprises a substrate layer, an inner layer and a surface layer which are sequentially formed on the inner surface of a glass container substrate, the surface layer is located on the outermost side, and the inner layer comprises a double-alkali cathode K2CsSb; the surface layer comprises a Cs2Te layer; and the substrate layer is an Al2O3 film layer. According to the photomultiplier adopting the photocathode containing the surface layer Cs2Te, the Cs2Te surface layer is evaporated on the surface of the K2CsSb double-alkali cathode to change the surface potential barrier of the K2CsSb photocathode, so that the purpose of preventing photoelectrons generated by thermal emission from entering vacuum is achieved, the dark current of the photomultiplier is reduced, and the noise performance of the whole photomultiplier is improved.

Description

technical field [0001] The invention belongs to the technical field of photocathode, and particularly relates to a photocathode with low thermal emission, a photomultiplier tube and a preparation method thereof. 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. However, the noise immunity of the photomultiplier tube is poor, and the large noise will affect the accuracy of the signal measurement. In order to measure weak signals more accurately, researchers have put forward higher requirements for the low noise of photomultiplier tubes. [0003] The sources of photomultiplier tube noise include thermal emission of photocathode, ionization of residual gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/34H01J9/12H01J43/08
CPCH01J1/34H01J9/12H01J43/08
Inventor 任玲王从杰孙建宁司曙光王兴超金睦淳王亮侯巍纪路路吴凯
Owner NORTH NIGHT VISION TECH
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