机载光学探测设备气动热噪声建模研究

Aerothermal Noise Modeling for Airborne Optical Dector

基于物理光学原理,由衍射光学理论推导计算光学系统对光学整流罩的像平面光场能量分布,获得在探测器平面上的整流罩热辐射光场归一化分布。用普朗克公式表述光学整流罩产生的气动热噪声强度。采用物理机理建模,可得较可信的气动热探测热噪声模型。对不同速度下载机产生不同温度的气动热噪声进行分析,由此评估在气动热噪声条件下,红外探测系统的探测效能。

The optical field energy distribution on the image plane of optical dome was derived from diffraction theory based on optics theory in this paper. The thermal radiation optical field normalization distribution on the detector plane was gained. The Planck formula was used to formulize aerothermal noise intensity generated by the optical dome. Thermal noise model for aerothermal detection with high confidence was obtained through the physical and mechanism modeling. The thermal noises produced by the aircraft at different temperature and speed were analyzed by the model. The performance of infrared detector system was evaluated with aerothermal noises existing.