Abstract. High speed time-resolved wavefront and imaging measurements were taken synchronously in-flight through both boundary layer and shear layer environments around the Airborne Aero-Optical Laboratory for Beam Control. Instantaneous modulation transfer functions and point spread functions (PSFs), which characterize image degradation, were generated using wavefront data. Instantaneous power-in-bucket ratios were extracted from both the image data and computed from the wavefront data, and the ratios were found to correlate well with each other. The lower power-in-bucket values and related increased blurring that occurred predominantly in the streamwise direction were associated with large-scale, large-amplitude wavefront spatial variations due to large organized vortical structures present in the shear layer. The boundary layer did not create any significant image blurring due to the low level of aero-optical distortions. Finally, spatial autocorrelation functions were extracted from the wavefront data using the stitching method and were used to compute time-averaged PSFs for different aperture diameters.

中文翻译：

---

不同飞行中航空光学环境导致的图像质量下降

摘要。高速时间分辨波前和成像测量是在飞行中通过机载航空光束控制航空光学实验室周围的边界层和剪切层环境同步进行的。使用波前数据生成表征图像退化的瞬时调制传递函数和点扩散函数 (PSF)。从图像数据中提取瞬时桶内功率比并从波前数据计算，发现这些比值相互之间具有良好的相关性。由于剪切层中存在大的有组织的涡旋结构，较低的桶内功率值和主要发生在流向的相关模糊增加与大规模、大振幅的波前空间变化有关。由于低水平的航空光学失真，边界层没有产生任何明显的图像模糊。最后，使用拼接方法从波前数据中提取空间自相关函数，并用于计算不同孔径直径的时间平均 PSF。