Research On The Illumination And Detection System Based On The Principle Of Non-imaging

With the development of the theory of non-imaging optics,non-imaging technology can realize the light energy collection and redistribution which has been widely used in the fields of illumination and laser detection.In the society of energy shortage,light-emitting diode(LED)is adopted to replace the traditional source which can realize green,environmental friendly lighting and indicate a new direction for the future development of the lighting industry.Free-form illumination optical design based on the theory of non-imaging optics has the advantages of small size,high degree of design,accurate control of light,and so on.This dissertation focuses on the research of LED free-form optics design.A series of calculation methods for free-form surface lenses are proposed to apply in different illumination occasions,which can achieve good lighting performance.Based on the principle of laser semiactive detection,a kind of non-imaging distributed aperture laser detection system is proposed to realize target detecting and tracking.The major research contents are as follows:(1)For circular-symmetry radiation pattern free-from lens design,a simple geometric-optics analysis is proposed to construct the total internal reflection(TIR)collimating lens.The TIR lens and an integrated prism with a diffuser are combined for the runway centerline light.A light intensity distribution of an approximate oval is obtained,and the intensity can satisfy the International Convention on Civil Aviation(ICAO)regulations after measurement.A relationship between the incident angle of the source and the corresponding emitted angle of the lens is established by a simple energy mapping based on the energy conservation law.Then circular-symmetry uniform illumination with any light distribution angle can be obtained through this method.The distribution curve model of the extended light source is proposed in this dissertation.The mapping relationship between the source and the target plane is established,then the redistribution of the mapping is optimized by the method of feedback which can achieve circular-symmetry uniform illumination with extended light source.(2)For non-circular-symmetry radiation pattern free-from lens design,free-form surface lenses for rectangular and side-emitting illumination are designed respectively.The relationship between the emitted angle of the lens and the target plane is established to construct the free-form surface lens.Oval arrangement with freeform lenses in the same direction is adopted for the road lamp simulation.The lighting performance can fully comply with road lighting requirement.Two types of side-emitting lenses and optical simulation results are described.The lens with better lighting performance is used for elevated taxiway edge light which has two sawteeth on the top of lens.Only one LED source is adopted to meet the intensity distribution of the Federal Aviation Administration(FAA).(3)A type of distributed aperture laser semiactive angle measurement system is designed for target detecting and tracking.Only one detector is used to detect target location from four distributed aperture optical systems through a 4×1 imaging fiber bundle.A telecentric optical system in image space is designed to increase the efficiency of imaging fiber bundles.According to the working principle of a four-quadrant(4Q)detector,fiber diamond alignment is adopted between an optical system and a 4Q detector.Tolerance analysis is carried out to determine tolerance limits of manufacture and installation errors of the optical system.A simulation model of a laser semiactive detection system is established to analyze the equivalent spot position with different FOVs on the 4Q detector photosensitive surface qualitatively.An experimental setup is built to verify the range of linear region and angle measurement error of laser semiactive detection system quantitatively.