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In vacuum system, area source electron gun emits electrons to bombard the standard screen. With the first anode and the second anode in different potentials, the images show the features of divergent, uniform, convergence and submerge. Photos, images acquired by brightness meter, and the image gray values are listed in Table 1. By image gray value analysis, it can be seen that in item no. 1, the electrons...
In high-vacuum conditions, the instrument can do detection and research efficiently on the luminescence features of fluorescence screen. It is a special purpose intelligent test equipment combined of optical, mechanical, electrical, computing and display. Vacuum cavity that is large cap closed, the turntable and the hot electron emission source is located in the space area. Through experiments we...
The ultraviolet image intensifier is a kind of vacuum image device with photocathode of Cs2Te (cesium tellurium). Its spectral response characteristic curve is measured with a specially designed spectral response measuring system, the quantum efficiency is calculated, the diffusing length of the minor carriers is analyzed. At last some opinions are brought to improve the technique.
In this paper, firstly the spectral response of transmission-type GaAs photocathode is measured online by the spectral response-testing instrument. Then the cathode is sealed in the third generation intensifier and put into the instrument again to get another spectral response curve. The variation of spectral response curves was compared. The results show that through the seal process, the spectral...
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