基于光谱补偿的激光告警超大视场成像光学系统设计

Design of Ultra-Large FOV Imaging Optical System for Laser Warming Based on Spectral Compensation

摘要:

针对大视场(field of view，FOV)、宽波段、高精度的星载激光告警成像需求，开展了基于光谱补偿技术的超大视场成像光学系统设计。设计并实现了182°成像视场的超广角光学系统，并通过滤光片光谱透过率设计对探测器光谱响应不均匀性进行了有效补偿。通过鬼像分析优化了光学系统的结构布局，并提出了系统的杂散光抑制措施。试验结果表明：采用所提光谱补偿措施，在实现太阳直射光抑制的同时，光学系统在激光告警波段内的光谱响应度差异由8.0 dB降低至0.5 dB；采用滤光片与衰减片分离放置的结构形式，杂散光强度与信号光主峰强度的比值降低至1.7×10-5，实现了杂散光的有效抑制。

Abstract:

To address the requirements for large field of view (FOV), broad bandwidth and high-precision satellite-borne laser warning imaging, an ultra-large FOV imaging optical system based on spectral compensation technology was designed. An ultra-wide-angle optical system with a 182° imaging FOV was designed and implemented. Through designing the spectral transmittance of optical filters, the non-uniform spectral response of the detector was effectively compensated. The structural layout of the optical system was optimized according to ghost image analysis, and stray light suppression measures were proposed. Experimental results demonstrate that the proposed spectral compensation method reduces the spectral responsivity variation from 8.0 dB to 0.5 dB in the laser warning band, while effectively suppressing direct sunlight interference. Furthermore, by adopting a separated filter-attenuator configuration, the ratio of stray light intensity to the main signal peak intensity is reduced to 1.7×10-5, which achieves effective stray light suppression.