摘要：To enlarge the detection range of traditional fiber-optic spectrometer,two rotating parabolic mirrors were first used in the design of fiber-optic collector for spectrometer,which can extend the detection range of spectrometer from centimeter-scale to50m,as a super-low altitude remote sensing detector under passive lighting *** to the performance requirements of fiber-spectrometer for optical collector,this study deduced the calculation formulae of design size of parabolic optical collector applied to different sensitivity spectrometers,different detection targets,different detection ranges and different *** on the calculation results,the model of fiber-optic collector with a diameter of16mm and a height of7.8mm was designed by *** then,TracePro,a light simulation software,was applied to ray *** simulation results of optical radiation magnification agrees well with theoretical value,and the relative error is less than0.78%.This optical collector can effectively extend the detection range of spectrometer and expand its application fields and *** with traditional refractive optical collector,it has several advantages of compact structure,low weight and low cost.