超二代及三代像增强器不同响应波段的参数测量及比较

对A光源分别进行550 nm、625 nm以及675 nm的短波截止,对比测量了超二代和三代像增强器的光谱响应、阴极灵敏度、增益、分辨力以及信噪比。在10^-1lx照度条件下,当对A光源进行675 nm的短波截止之后,三代像增强器的分辨力未出现下降,而超二代像增强器的分辨力却下降到初始值的94%;但在10^-4lx照度条件下,当对A光源进行675 nm的短波截止之后,三代像增强器的分辨力下降到初始值的90%,而超二代像增强器的分辨力下降到初始值的85%。但信噪比越高的像增强器,分辨力降低的比例越低。对于超二代和三代像增强器而言,如果在A光源条件下的性能参数相同,但在不同的短波截止条件下使用时,其性能并不相同,三代像增强器的性能更好。尽管超二代像增强器在不同短波截止波长条件下性能参数下降的比例较三代像增强器下降的比例高,但差距并不大,因此使用过程中的性能差距也不大。

Measure and Comparison between the Second-generation and the Third-generation Image Intensifier within the Different Region of Wavelength

The spectral response,cathode sensitivity,gain,resolution and signal-to-noise ratio of the super second-generation and the third-generation image intensifier were measured at the short wave cut-off of 550 nm,625 nm and 675 nm for A luminant.Under 10^-1 lx illumination,the resolution of the thirdgeneration image intensifier does not decrease after undertaking 675 nm short wave cut-off for A luminant,while the resolution of super second-generation image intensifier drops to 94%of the initial value;however,under 10^-4 lx illumination,the resolution of the third-generation image intensifier decreases to 90%of the initial value after undertaking 675 nm short wave cut-off for the A luminant,while that of the super second-generation image intensifier decreases to 85%of the initial value.In addition,the resolution decreases with the decrease of illumination.For the super second-generation and third-generation image intensifiers,although the parameters are the same under the illumination of A luminant,but when used in different short wave cut-off wavelengths,the performance of the third-generation image intensifier is better.Although the decline proportion of parameters for super second-generation image intensifier is higher than that of third-generation image intensifier under different short wave cut-off wavelengths,the difference is not obvious,so the performance difference during use is not obvious.