Study on Railway Color Signal Optical System for Raising Train Speed

Color light signal is the fundamental equipments of railway signaling system. The command signals they send out directly affect the safety and efficiency of railway transportations. There is little improvement in railway color signal optical system in the past 50 years. This paper introduces a new research result, AG-type lens railway color signals optical system. The new system is developed for the need of color signals for raising train speed. It is the first to apply the new technology, Frenel lens un common axis design and AUTO CAD high efficiency method successfully. This system consists of Frenel lens and G type signal light source .The Frenel lens have short composite focal distance, good corresponding stairs, wide effective aperture. The G type signal light source has good filament shape, high luminous efficiency and rational luminous flux distribution. Both lab and site tests indicate that this system is safe and reliable, without mis indication, the flat filament shape well matches the lens group′s focal circular. It also has high utilization of light source and long distance of lighting indication. This system has good prospective application.