基于曲面反射镜的光谱仪用光纤集光器设计

为了提高传统光纤光谱仪的探测距离, 首次提出采用两片旋转抛物面反射镜进行光谱仪用光纤集光器入射光学设计, 将光谱仪探测距离从厘米量级提高到50 m, 可用于户外被动光源条件下超低空遥感探测. 从光纤光谱仪对集光器的性能要求出发, 推导出适用于不同灵敏度光纤光谱仪, 针对不同探测目标、 探测距离和不同天气条件下的抛物型集光器外围尺寸计算公式. 根据计算结果, 利用ZEMAX光学仿真软件设计出直径16 mm, 高7.8 mm的光纤集光器模型, 并利用TracePro光纤模拟软件进行追光分析, 光学辐射放大率的仿真结果与理论计算结果完全吻合, 误差小于0.78%. 该集光器的设计可有效提高光纤光谱仪探测距离, 拓展其应用领域和范围, 且与传统透射型集光器相比, 具有结构紧凑、 轻便化、 价格低廉等优点.

Design of fiber-optic collector for spectrometerbased on curved mirror

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 to 50 m, as a super-low altitude remote sensing detector under passive lighting conditions. According 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 weathers. Based on the calculation results, the model of fiber-optic collector with a diameter of 16 mm and a height of 7.8 mm was designed by ZEMAX. And then, TracePro, a light simulation software, was applied to ray tracing. The simulation results of optical radiation magnification agrees well with theoretical value, and the relative error is less than 0.78%. This optical collector can effectively extend the detection range of spectrometer and expand its application fields and scopes. Compared with traditional refractive optical collector, it has several advantages of compact structure, low weight and low cost.