5 Tricks to Control Stray Light
When designing an optical system, an optical engineer needs to consider where the light to be directed, and also where the light shouldn’t be propagating. We call this unwanted light: stray light. Stray light is a major limiting factor in many imaging systems. When stray light enters the system, it degrades the signal-to-noise ratio or […]
Understanding the optics behind a PAPI light
In a previous article we talked about Aviation Light Optics. and discussed a runway light system called Precision Approach Path Indicator (PAPI). Now we would like to go more in detail into PAPI design and describe their design requirements. The PAPI system is a set of four light sources that help the pilots correct the […]