Effect of Using High Signal-to-Noise Image Intensifier Tubes on Night Vision Goggle (NVG) Aided Visual Acuity

摘要

A night vision goggle (NVG) image intensifier (I2) tube's signal-to-noise ratio (SNR) determines the low-light resolution capability, therefore, the higher the SNR, the better the ability of the tube to resolve objects under low illumination conditions. Two NVG models were used to determine if visual performance would improve as a result of a goggle's higher SNR characteristic. The F4949G-TG goggles, equipped with 12 tubes utilizing thin-filmed technology allowing for a higher SNR, and the F4949G goggles were tested. Twelve participants tested each goggle under six illumination and contrast conditions using an automated Landolt C visual acuity task. The results indicated statistically significant, although small, visual acuity differences between the two NVG models. Visual acuity scores obtained with the F4949G-TG model were better than those obtained with the F4949G at all illumination and contrast conditions examined, indicating an increase in the signal-to-noise ratio did contribute to the differences in visual performance.