大气风场探测萨尼亚克干涉仪光程差的计算及探测模式研究

Optical Path Difference and Detection Mode of Sagnac Interferometer Used for Upper Atmospheric Detection

提出了基于时空混合调制的大气风场探测模式;应用光线追迹方法推导了一种改型萨尼亚克干涉仪在任意角入射时的光程差;从理论上对该干涉仪的参量作了分析计算;通过对同种、异种材料组合的理论分析,得出了异种材料组合的改型萨尼亚克干涉仪更加适合高层大气风场探测。该干涉仪具有稳态、大视场、大光程差、时空混合调制探测模式等显著特点。该研究发展了高层大气风场的被动探测理论,对风场探测技术研究、探测模式和工程化都具有十分重大的理论及实践意义。

Upper atmospheric detection based on temporarily and spatially mixed modulated detection mode was put forward. The accurate optical path difference versus the incidence angle of a modified Sagnac interferometer was calculated by the ray-tracing method. Theoretically the parameter of the interferometer was calculated and analyzed. Compared with the combination of the same and different material, it can be concluded that different combination of material is more suited for upper atmospheric detection. This interferometer has many distinct advantages, such as steady state, wide field of view, long optical path difference, temporarily and spatially mixed modulated detection mode etc.. The research developed the theory of upper atmospheric detection and it is quite significant to the research of detection technique, detection mode and engineering in both theory and practice.