Design and preparation of cut-off filter for observation scope
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摘要:
基于观察瞄准镜系统中胶合目镜对滤光片的使用需求，设计了一种用于瞄准镜光学系统的截止滤光片，消除了滤光片的半波孔，压缩了通带波纹。采用电子束热蒸发技术制备了滤光片并测试其透过率，在400 nm～630 nm的平均透过率为95.76%，在655 nm～800 nm的平均透过率为0.06%，样片通过了盐雾测试和机械牢固度测试，制备结果满足设计需求。
Abstract:Based on the requirements of glued eyepiece for the optical filter in the observation scope system, a cut-off filter for the optical system of the scope was designed, which eliminated the half-wave hole of the filter and compressed the passband ripple. The optical filter was prepared by electron beam thermal evaporation technology and its transmittance was tested. The average transmittance in the range of 400 nm~630 nm is 95.76%, and the average transmittance in the range of 655 nm~800 nm is 0.06%. The sample passes the salt spray test and the mechanical firmness test, and the preparation results meet the design requirements.
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图 3 G|0.5L (0.95H1.05L)16 H0.5L |G消除半波孔膜系曲线
Figure 3. Film system curve of half-wave hole elimination of G|0.5L (0.95H1.05L)16 H0.5L |G
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图 4 G|0.5L (0.95H1.05L)16 H0.5L |G优化膜系曲线
Figure 4. Optimized film system curve of G|0.5L (0.95H1.05L)16 H0.5L |G
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图 5 G|0.3H0.5L(0.95H1.05L) 16 H0.5L0.3H|G优化膜系曲线
Figure 5. Optimized film system curve of G|0.3H0.5L(0.95H1.05L) 16 H0.5L0.3H|G
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图 7 样片C和优化膜系曲线对比图
Figure 7. Comparison of sample C curve and optimized film system curve
表 1 材料的主要参量
Table 1 Main parameters of materials
Material Index of refractive nd @589 nm H-ZK11 1.63 NOA61 1.56 
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