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以小型化、高效率为目的,提出了利用全反射原理,采用复合棱镜结构,通过适当选配光学材料,实现在主被动复合成像雷达接收光学系统中对主、被动光束进行高效率分光的方案。根据技术指标要求完成了分光系统的设计,该系统可以对主动成像光波波长850 nm,全视场角3.5°,被动成像光波中心波长9.7μm,全视场角6.9°的两束光进行高效率的分光,计算结果表明,对主被动光波分光效率的理论值都可以达到98%以上,该方案还兼具结构稳定,工艺简单,易于工程实现的优点。该设计方案,可以在主被动复合成像激光雷达接收系统中实现主被动共用孔径,从而实现系统的小型化。
For the purpose of miniaturization and high efficiency, a scheme of using total reflection principle and compound prism structure to realize high-efficiency splitting of the main and passive beams in the main and passive composite imaging radar receiving optical system is proposed through appropriate matching of optical materials . The design of the spectroscopic system is completed according to the technical requirements. The system can perform high efficiency on active imaging light with wavelength of 850 nm, full angle of view of 3.5 °, center wavelength of passive imaging light with a wavelength of 9.7 μm and full angle of field of 6.9 ° The calculated results show that the theoretical value of the spectral efficiency of both the active and passive light waves can reach more than 98%. The scheme also has the advantages of stable structure, simple process and easy realization of engineering. The design scheme can realize the active and passive common aperture in the main passive composite imaging laser radar receiving system, so as to realize the system miniaturization.