Rapid eyebox measurement for augmented reality waveguides.

Eyebox performance is a fundamental factor used to characterize the overall performance of augmented reality (AR) and virtual reality (VR) eyewear. Conventional methods to map three-dimensional eyeboxes are time consuming and data intensive. Herein, we propose a method for rapid and accurate measurement of the eyebox in AR/VR displays.

Dynamic Enhancement of Nitric Oxide Radioluminescence with Nitrogen Purge.

Remote detection of alpha radiation is commonly realised by collecting the light, the radioluminescence, that is produced when alpha particles are stopped in air. Radioluminescence of nitric oxide (NO) is primarily emitted between 200 nm and 300 nm, which makes it possible to use it for remote detection under daylight conditions. Quenching by ambient oxygen and water vapour, however, makes it generally difficult to effectively create NO radioluminescence.

Alpha Radiation-Induced Luminescence by Am-241 in Aqueous Nitric Acid Solution.

When exposed to air, alpha particles cause the production of light by exciting the molecules surrounding them. This light, the radioluminescence, is indicative of the presence of alpha radiation, thus allowing for the optical sensing of alpha radiation from distances larger than the few centimeters an alpha particle can travel in air. While the mechanics of radioluminescence in air and other gas compositions is relatively well understood, the same cannot be said about the radioluminescence properties of liquids.

Intense radioluminescence of NO/N-mixture in solar blind spectral region.

Luminescence in air induced by alpha particle emitters can be used to optically detect radioactive contamination from distances that surpass the range of the alpha radiation itself. Alpha particles excite nitrogen molecules in air and the relaxation creates a faint light emission. When the composition of the gases surrounding the alpha particle emitter is altered then the luminescence spectrum changes.