论红外变像管积分灵敏度的标准(上)

The Standard for Infrared Sensitivity of Image-Converter Tube (First part)

主动式红外夜视仪的可靠性主要决定于红外变像管,而红外变像管的可靠性和工作寿命则决定于红外光电阴极——半透明银氧铯光电阴极的性能和寿命。本文从银氧铯阴极光谱特性的稳定性出发,阐述了光谱特性与红外积分灵敏度S之间的有机联系,并得出结论:S≥8μm/lm的光电阴极是稳定的,具有较一致的光谱特性;S<7μm/lm的光电阴极不稳定,其光谱特性不断变化。因此,合格变像管光电阴极的红外积分灵敏度S>8μm/lm。同时,从寿命试验证实,S=8μm/lm的变像管有超过技术条件一倍以上的工作寿命,性能稳定,从而能确保红外夜视仪的寿命,增加其可靠性。因此,银氧铯光电阴极红外积分灵敏度标准的确定对红外夜视仪的视距和可靠性是十分重要的。

The reliability of infrared night vision apparatus is mainly dependent upon the characteristics and life-time of photocathode of image-converter tube. The relationship between spectral characteristics and infrared sensitivity was investigated based on the stability of spectral characteristics of photocathode. The results showed that the photocathode with infrared sensitivity≥8μA/lm is very stable, exhibiting an unchanging spectral characteristics. However, the spectral characteristics of photocathode with infrared sensitivity≤7μA/lm is unstable. It is suggested that the infrared sensitivity of 8μA /lm should be used as one of the standards for evaluating the image-converter tube.