针对基于中红外声光可调谐滤波器（Acousto-Optic Tunable Filter, AOTF）的光谱成像系统观测运动目标过程存在光谱数据漂移问题，提出了一种基于声光互作用的在线光谱校准方法。根据目标光谱成像位置与驱动频率，构建了逆向光线追迹模型，从而实现了光谱数据的在线校准，满足运动目标探测的实时性要求。该方法能为后续目标检测、识别与跟踪提供稳定且精确的光谱数据立方体。在实验验证方面，利用设计研制的平行光入射的中红外AOTF光谱探测系统，以黑体与中红外滤波片组合作为目标光源，对光谱校准模型开展实验验证。最终实验结果表明，针对位于不同视场处的模拟运动目标，校正后的光谱漂移相对误差均优于4.45%，有利于提升对运动目标光谱探测的应用能力。

Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals (FLCs) with photo-alignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this study we demonstrate a circular Dammann grating (CDG) with a diffraction efficiency of 84.5%. The achieved response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic liquid crystal devices. By applying a low electric field (V = 6 V) to the FLC CDG, it is switched between the eight-order diffractive state and the transmissive diffraction-free state.