Patent ID: 7235779

Claim:
Portable military field use night vision device evaluation apparatus comprising the combination of: a standardized military night vision device performance assessment chart including a plurality of night vision device resolution patterns of selected line width and line spacing character; a source of military night vision device compatible selectable irradiance disposed in proximity with said military night vision device performance assessment chart; a portable irradiance measuring apparatus disposed within an area irradiated by said source of military night vision device compatible selectable irradiance; said portable irradiance measuring apparatus including a received irradiance to first electrical signal transducer element, a plurality of selectively accessed standardized ambient irradiance-related reference second electrical signals and an electrical signal comparison apparatus connecting with each said first and second electrical signals; and said electrical signal comparison apparatus including analog to digital converter and signal processing elements coupled to an evaluation apparatus containing a remotely visible, graphic multiple luminous element, military night vision device-indiscernible irradiance level indicating display.