中波红外全景成像仪线扩散函数的模拟分析与验证

Modeling Analysis and Verification of LSF for a Midwave Infrared Panoramic Imaging Sensor

线扩散函数是评价成像系统成像质量的一个重要参数,线扩散函数的模拟分析与验证对成像仪的研制至关重要。本文首先分析中波红外全景成像仪探测器所接收到的辐亮度,从理论上估算了全景成像仪的线扩散函数,然后通过斜缝法加以验证,试验结果证实了理论模型的正确性。并对线扩散函数经离散傅里叶变换计算而得MTF传递函数,结果与理论得出的系统MTF基本符合,进一步证明了这种模拟分析方法的可行性。

Panoramic imaging sensor operating in the Midwave Infrared （MWIR） band is an important new imaging sensor for maritime research and application. Line Spread Function （LSF） is one of the key parameters to quantitatively evaluate the image quality. The modeling analysis and testing of LSF are important for developing an imaging sensor. In the present paper, the spectral radiation observed at the focal plane array of the panoramic imaging system is analyzed, The LSF of the panoramic imaging system is theoretically evaluated and tested through canted slit-method. The test results have proved the correctness of this theoretical model. The modulation transfer function is calculated by discrete Fourier transform for LSF. Results match the system theoretical MTF well, which indicates that LSF modeling analysis method is feasible.