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A comparison between phosphors for aviator's night vision imaging system

J Rabin¹, W McLean

¹Aircrew Health and Performance Division, U.S. Army Aeromedical Research Laboratory, Ft. Rucker, AL 36362, USA.

Aviation, Space, and Environmental Medicine

|May 1, 1996

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The P43 phosphor is suitable for night vision goggles (NVG), performing similarly to the P22 phosphor in visual acuity and contrast sensitivity. Mixing P22 and P43 phosphors in the same NVG is not recommended, though P43 shows slight advantages in dynamic contrast.

Area of Science:

Optics and Photonics
Human Factors Engineering
Military Technology

Background:

Current night vision goggles (NVG) utilize green, isochromatic P22 phosphor displays.
Future NVG systems may incorporate P43 phosphor, offering a narrower, yellowish-green spectrum.
Transitional NVG systems might pair P22 and P43 phosphors within the same unit.

Purpose of the Study:

To evaluate the performance and suitability of the P43 phosphor for NVG applications.
To assess the impact of mixing P22 and P43 phosphors in a single NVG unit on user performance.

Main Methods:

Three NVG systems were tested: P22-only, P43-only, and a mixed P22/P43 system.
Six subjects were evaluated on visual acuity (VA), contrast sensitivity (CS), flicker sensitivity, and dynamic CS.

Related Experiment Videos

Performance metrics were measured across simulated night sky conditions for all three systems.

Main Results:

No significant differences in VA or CS were observed between P22, P43, and mixed systems under various lighting conditions.
Flicker sensitivity remained consistent across all tested NVG systems.
Dynamic CS performance was marginally superior with the P43 phosphor, potentially due to its faster decay time.

Conclusions:

The P43 phosphor is a viable option for NVG, whether used alone or paired.
Minimizing the mixing of P22 and P43 phosphors within a single NVG is advisable.
Further research should consider additional factors influencing performance with different NVG color displays.