Design of sunlight direct-enhanced illumination system in highway tunnel

In order to eliminate the black-hole effect and white-hole effect efficiently by taking use of green energy, based on the research of sunlight conveyor, a new system for enhanced illumination is developed by using enhanced parallel sunlight on the import and export zone of the highway tunnel. High efficient and long distant sunlight transporting is achieved under the condition of no-optical-fiber-like medium through optical path transformation and reflection. The technical requirement of self-adaptation with the natural sunlight in tunnel enhanced illumination is solved automatically by taking the disadvantage of sunlight intensity changing. According to the fixed photo-receptor system, a polar axis type automatic tracking system is designed, which realizes the realtime tracking for the sunlight. The experiment result shows that the system not only improves the transmission efficiency by about 40% without using optical fiber or light pipe, but also develops a new way for the popularization and application of direct sunlight lighting in the tunnel and other underground engineering in the future.