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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50m,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16mm,高7.8mm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。
In order to improve the detection distance of traditional fiber spectrometer, the optical design of optical concentrator with two rotating paraboloidal mirrors is proposed for the first time, and the detection range of spectrometer is increased from centimeter to 50m. It can be used in outdoor low-altitude Remote sensing detection. Based on the requirement of optical fiber spectrometer for concentrator performance, the formula for calculating the peripheral dimension of parabolic concentrator is proposed for different sensitivity optical fiber spectrometers with different detection targets, detection range and weather conditions. According to the calculation results, a model of optical fiber condenser with diameter of 16mm and height of 7.8mm was designed by using ZEMAX optical simulation software. TracePro optical fiber simulation software was used to carry out chasing analysis. The simulation results of optical radiation magnification exactly coincided with the theoretical calculation, Less than 0.78%. The design of the light collector can effectively improve the detection range of the fiber spectrometer and expand its application field and range. Compared with the traditional transmissive light collector, the light collector has the advantages of compact structure, light weight and low price.