The microchannel plates are electron multiplier which mainly used in image intensifier tubes for imaging and intensification of the photoelectron image. In this paper, the research models of the funnel microchannel plate are established by the CST Studio Suite software. The whole research model includes the particle emission source, the funnel microchannel plate model with input reinforcement film and the detector module. Under the same parameter settings of the particle emission source, the influence of the input electrode depth of the funnel microchannel plate on the incident particles is studied. The detector module is placed in a fixed position and the electrode depth vary from 0 μm to 7 μm with an appropriate step. Under different electrode depth, the electron distributions on the input surface and at the 7 μm depth of the funnel microchannel plate are obtained. After processing the data, the influence of the input electrode depth on the incident electron distribution is obtained, which lays a foundation for the further theoretical and structural research of the funnel microchannel plate. Meanwhile, the related experiments are carried out for the funnel microchannel plate with different input electrode depth, and the experimental results are compared with the simulation results.
Image intensifiers have been wildly used for military, law enforcement and commercial applications. Its small size, weight and power (SWaP) make it ideal for integration into different systems. Normally, the performance of image intensifiers is measured at room temperature, but it is expected to operate in vary temperature environments. Therefore, it is very important to know the variation of the image intensifiers performance with temperature. Here, we characterize the variation of intensifier photocathode, microchannel plates (MCPs) and phosphor screen over a large range of temperatures. The “bare” tube is connected to high voltage power supplies via cables. The power supplies and all measuring instruments are outside the chamber in order to avoid the influence of temperature. The result could be used to optimize and control the luminance gain of image intensifiers.
In this paper, the influence of the microchannel plates (MCP) opening area ratio (OAR) and secondary electron emission (SEE) coefficient of SEE layer on the noise factor of image intensifier tube have been studied. According to the experiment, the influence percentage of MCP OAR and SEE coefficient of MCP SEE layer on noise factor reduction has been obtained. A MgO SEE layer with SEE coefficient of 4.5 was coated on the MCP input side with an OAR of 68%. After being assembled as an image intensifier, the noise factor of MCP decreases from 1.638 to 1.096, and drop 33.0%, which laid a good foundation for improving the signal-to-noise ratio of image intensifier.
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