Research On Key Technologies Of Electromagnetic Compatibility Test System Of Optical Parameter For Automotive Lamps

Quantitative detection of lamps optical parameters plays an important role in guarantee safety of automobiles.However,Electro-Magnetic Compatibility(EMC)testing and measurement of lamps optical parameters under strong electromagnetic interference are still facing with technical difficulties.The purpose of this thesis is to implement a rapid,accurate,and automatic method for optical parameters quantitative detection of auto lamps under strong electromagnetic interference.The research is based on the analysis of EMC testing standards and the specific requirements for auto lamp testing.A light intensity quantitative-monitoring device for lamps testing under strong electromagnetic interference is also designed and developed.Firstly,after a brief introduction to the history of automobile lamps,the development of optical parameter detecting and EMC testing technology are reviewed.Standard testing methods are systematically studied by comparing the EMC testing standards of different countries.Secondly,a novel light intensity monitoring device for anti-strong electromagnetic interference has been presented by using photoelectric conversion and weak signal detection technology.The device is design to automatic detecting the optical parameters under strong electromagnetic interference.It consists of a light intensity monitoring subsystem and an electromagnetic anti-interference test subsystem.The two subsystems are connected by a General-Purpose Interface Bus(GPIB).The whole system is automatic controlled by a computer.Experimental results showed that the device can detect the optical parameters of auto lamps under electromagnetic interference.Thirdly,two different monitoring system for proximal and distal optical parameters under strong electromagnetic interference are developed based on the presented light intensity monitoring device.Validity of the two systems are both verified via experiments.Furthermore,two measurement systems for rotation speed and motion speed measurement are also proposed based on the presented device.Finally,the design and results of a series of experiments are introduced which are used to verify the performance of the presented device.The results proved that the device can detect light intensity and electromagnetic immunity for lamps in the environment with strong electromagnetic interference.In conclusion,the research results of the thesis lay a foundation for the future implementation of light intensity quantitative-monitoring devices under strong electromagnetic interference as well as further extended applications.