Research on testing instrument and method for correction of the uniformity of image intensifier fluorescence screen brightness

To test the parameters of image intensifier screen is the precondition for researching and developing the third generation image intensifier. The picture of brightness uniformity of tested fluorescence screen shows bright in middle and dark at edge. It is not so direct to evaluate the performance of fluorescence screen. We analyze the energy and density distribution of the electrons, After correction, the image in computer is very uniform. So the uniformity of fluorescence screen brightness can be judged directly. It also shows the correction method is reasonable and close to ideal image. When the uniformity of image intensifier fluorescence screen brightness is corrected, the testing instrument is developed. In a vacuum environment of better than 1×10-4Pa, area source electron gun emits electrons. Going through the electric field to be accelerated, the high speed electrons bombard the screen and the screen luminize. By using testing equipment such as imaging luminance meter, fast storage photometer, optical power meter, current meter and photosensitive detectors, the screen brightness, the uniformity, light-emitting efficiency and afterglow can be tested respectively. System performance are explained. Testing method is established; Test results are given.