Research on Brightness Gain Temperature Characteristics of Super Gen. II Low-Light-Level Image Intensifier Using High-voltage DC Power Supply
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摘要: 针对匹配普通高压电源的超二代微光像增强器亮度增益在高温条件下大幅下降的问题，根据理论分析搭建了高低温试验平台，并分别对普通高压电源超二代像增强器、像增强管和普通高压电源的高低温特性进行研究。试验结果表明，匹配普通高压电源的超二代像增强器高温（55℃）亮度增益与低温（－55℃）相比衰减约65%；在阴极电压、MCP电压和阳极电压恒定的条件下，像增强管高温亮度增益仅衰减约20%，且主要是由于阴极灵敏度和荧光屏发光效率随温度升高而降低导致的；普通高压电源高温（55℃）与低温（－55℃）相比阴极电压降低约40 V，MCP电压降低约18 V，阳极电压降低约100 V，三者共同作用加剧了普通高压电源超二代像增强器高温亮度增益的衰减。因此，在高温条件下通过软、硬件的方式对电源阴极电压、MCP电压和阳极电压进行补偿是提高普通高压电源超二代微光像增强器高低温亮度增益一致性的有效手段。Abstract: Aiming at the problem that the brightness gains of super Gen. Ⅱ image intensifiers, equipped with high-voltage DC power supplies, substantially decrease at high temperatures, according to the theoretical analysis, this study developed high and low temperature test platforms to study the temperature characteristics of an image intensifier with a high-voltage DC power supply, an image intensifier tube, and a single high-voltage DC power supply. The experimental results show that the brightness gain of this type of image intensifier at a high temperature (55℃) decreased by approximately 65% than that at a low temperature (-55℃). However, on supplying constant cathode, MCP, and anode voltages to the image intensifier tube, the brightness gain decreased by 20%, which was mainly due to the decrease in the cathode sensitivity and luminous efficiency of the fluorescent screen with the increase in temperature. Compared with low temperature (-55℃), t he cathode voltage of the high-voltage DC power supply was reduced by approximately 40 V at high temperature (55℃), whereas the MCP and anode voltages were reduced by approximately 18 and 100 V, respectively. These three factors accelerated the attenuation of the brightness gain of the image intensifier at high temperatures. Therefore, compensating the cathode, MCP, and anode voltages using software and/or hardware to the power supply can be an effective method to improve the brightness gain consistency of super Gen. Ⅱ image intensifiers with a high-voltage DC power supply at various temperatures.
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Keywords:
- image intensifier /
- brightness gain /
- cathode sensitivity /
- luminous efficiency
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图 2 普通高压电源像增强器光电流温度特性曲线
Figure 2. Photocurrent temperature characteristic curve of image intensifier based on high-voltage DC power supply
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图 3 像增强管光电流温度特性曲线
Figure 3. Photocurrent temperature characteristic curve of image intensifier tube
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图 4 像增强管阴极灵敏度温度特性曲线
Figure 4. Cathode sensitivity temperature characteristic curves of image intensifier tubes
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图 5 像增强管荧光屏发光效率温度特性曲线
Figure 5. Fluorescent screen luminous efficiency temperature characteristic curves of image intensifier tubes
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图 6 像增强管阴极灵敏度与阴极电压的关系
Figure 6. Relationship between cathode sensitivity of image intensifier tube and Vc
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图 7 像增强管亮度增益与MCP电压的关系
Figure 7. Relationship between brightness gain of image intensifier tube and Vmcp
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图 8 像增强管荧光屏发光效率与阳极电压的关系
Figure 8. Relationship between fluorescent screen luminous efficiency of image intensifier tubes and Va
表 1 MCP负载温度特性
Table 1 Temperature characteristic of MCP load
T/℃ $ {L_{{\text{mcp}}}}/{\text{M}}\Omega $ 4260# 5147# 1161# -55 710 740 902 25 150 155 190 55 92.5 96 118 
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表 2 普通高压电源高低温电压变化情况
Table 2 High and low temperature voltage changes of high-voltage DC power supply
T/℃ 4260# 5147# 1161# Vc/V Vmcp/V Va/kV Vc/V Vmcp/V Va/kV Vc/V Vmcp/V Va/kV -55 -199 -839 5.79 -202 -836 5.76 -202 -837 5.82 25 -194 -827 5.74 -193 -825 5.74 -195 -826 5.79 55 -162 -821 5.67 -163 -819 5.68 -164 -819 5.73
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