In order to improve the calculation accuracy of multialkali photocathode image intensifier’s modulation transfer function, base on the modulation transfer function model of proximity focusing structure. Collecting the modulation transfer function data of image intensifiers that having different cathode types, different cathode materials’ escape equivalent initial potential of photoelectron how to affect modulation transfer function is explored. The modulation transfer function model is optimized on the strength of cathode material characteristic parameter. The results show that in view of the difference between the cathode material characteristic parameters, the SSE between the calculated value of modulation transfer function optimized model and the measured value is less than 6, especially in the high spatial frequency region. The results have theoretical significance for further improving the resolution of high performance image intensifier.
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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