Simulating Variations in Night Sky Irradiance Via CRT Projector Controls

Availability of spectrally correct simultaneous near-IR and visual imagery in night mission capable simulators would improve night vision goggle NVG training fidelity. While providing the aided, through-the-goggle view, it can also provide unaided peripheral and under-the-goggle views of the simulated nighttime scene. Within certain constraints, a properly modified CRT projection display can furnish both. In addition, computer automated or manual adjustment of projector contrast and brightness controls could also effectively simulate a range of moon phase and time-of-night conditions. After gamma mapping an off-the-shelf CRT projector for various combinations of brightness and contrast control settings, the gamma corrected display imagery was used to stimulate an ANVIS. Together, the contrast and brightness controls were used to reduce or increase the projector output to simulate changing nighttime conditions. This report discusses some of the issues, practical constraints and findings of the research investigation.