The core components of Image intensifier is microchannel plate (MCP) and fluorescent screen component. The present paper deeply studies output signal-to-noise ratio (SNR) characteristics of MCP and fluorescent screen component. A tester system using to the evaluation of characteristics of the output SNR of MCP and fluorescent screen component, consists of a vacuum system, a surface electron source, mechanical mechanism components ,a high-voltage power supply system, a signal processing system, communication interfaces, a data acquisition and control system, computer system, and testing software. a hot cathode used as an electron source, generates a surface electron flow to provide the input signal. A photomultiplier tube is used to detection faceplate output brightness of the light spot. Then, the output SNR of MCP and fluorescent screen component is processed with a combination of methods of the hardware filter and digital filtering software. The output SNR of MCP and fluorescent screen component is measured under different conditions, and the results are analyzed. This test system Provide a technical to promote the image intensifier research, and experience to testing other parameters or in other areas of research.
A system of signal-to-noise ration (SNR)tester for LLL image intensifier is reconstructed . To realize SNR tester for UV
image intensifier,the signal processing module and measurement software of the tester are reconstructed.The system of
UV optical path is used. Based on photoemission mechanism of photocathode, noise factor of photocathode is concerned
with quantum yield. In a range,noise factor of micro-channel plate(MCP) is decreased with the increase in gain. For a
fixed size micro channel,the gain of MCP is increased as the voltage of MCP rises. The analyzed results show that when
the voltage of MCP is in the range of -700V~-850V,the noise factor is monotonically decreased,when it exceed -850V,
MCP is saturated. Although gain has continued to increase, noise factor is in the state of saturation. Experiment platform
is builded according to SNR tester principle diagram of UV image intensifier.The results are given and analyzed. The
conclusion is proved that the effect of voltage of MCP on the SNR of UV image intensifier is compatible with the
analysis of theory.