Passive Night Sight using Image Intensifier Minimum Resolvable Contrast Model

Performance study of a passive night sight has been carried out using an image intensifierminimum resolvable contrast (IIMRC) model. It has been shown that for two identically designedpassive sights, the one incorporating super gen tube performs better by factor of 1.3 againstthe other incorporating second gen tube. Effects of spectral characteristics of night-skyillumination as also spectral reflectance of scene elements have been investigated. It has beenconcluded that field performance of passive night sight may be correlated to dark-tunnelmeasurements of limiting resolution at illumination level corresponding to near-starlit conditionfor acceptance or otherwise of the sight