LASER based Car/Train Head Lamps

Next generation Car Lighting Concept

TAYAB FAROOQGraduate School of Tsinghua UniversityUniversity Town, Shenzhen, China

Basic Head Lamps Light sources• Tungsten (钨 )• Tungsten-halogen (卤钨灯 )• Halogen infrared reflective (HIR) (卤素灯红外反射 )• High-intensity discharge (HID)高强度气体放电灯• Light Emitting Diodes (LED)

Limitations• Glare (强光 )• Mercury content (汞含量 )• Cost (成本 )• Color temperature (色温 )• Non Uniformity (不是均匀 )• Effect the car’s Fuel consumption (燃油消耗 )

L.E.D head lamps• LED HEAD LIGHTS are becoming the new light source for Next generation Cars• Audie introduce the MATRIC LED HEAD LAMPS in its MODEL A8 (2014) , that is to be launched by the end of this year.• There are 5 matrix of LEDs, each matrix consist of 5 High BEAM LED’s, so there is total number of 25 LED’s per Lamp.

L.E.D head lamps

Laser Beam Based Head Lamps• New Idea• More powerful and more accurate light source then

tungsten, HID or LED head lamp source.• Give more lumens per watt as compare to LED based

head lamps.• Target range is much more bigger and uniform then

LED based head lamps.

Theory (white Light)• Add three LED SOURCE.• Expensive method (RED, GREEN

Lasers are much more expensive then Blue Lasers)• Not accurate • Need high degree of calibration.• (small change in any angle may change the color of output light)• More power consumption

Theory (White light)

• Phosphorus Coating to get White LED.• Easy and Cheap method to get White Light• Output light is more safe for human eye• Technically the resulted output light is not called as laser,because the resulted light is no more monochromatic, and the divergence angle of light becomes very wide.

Theory (White Light)

• Different Color temperature for different Phosphorus concentration.• We can emit Light according to our require color temperature by modifying the phosphorus concentration

Block Diagram

Block Diagram

Physical Structure

Physical Structure

Light Output Results

Problems• How to Make Hi/Low Beam

• How to make light Rectangular Uniform

• How can we adjust the area of spot on target plane