Dynamic Aberration Correction for Conformal Window of High-Speed Aircraft Using Optimized Model-Based Wavefront Sensorless Adaptive OpticsReportar como inadecuado


Dynamic Aberration Correction for Conformal Window of High-Speed Aircraft Using Optimized Model-Based Wavefront Sensorless Adaptive Optics


Dynamic Aberration Correction for Conformal Window of High-Speed Aircraft Using Optimized Model-Based Wavefront Sensorless Adaptive Optics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1

School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

2

Beijing Institute of Space Mechanics & Electricity, Beijing 100090, China





*

Author to whom correspondence should be addressed.



Academic Editor: Vittorio M. N. Passaro

Abstract For high-speed aircraft, a conformal window is used to optimize the aerodynamic performance. However, the local shape of the conformal window leads to large amounts of dynamic aberrations varying with look angle. In this paper, deformable mirror DM and model-based wavefront sensorless adaptive optics WSLAO are used for dynamic aberration correction of an infrared remote sensor equipped with a conformal window and scanning mirror. In model-based WSLAO, aberration is captured using Lukosz mode, and we use the low spatial frequency content of the image spectral density as the metric function. Simulations show that aberrations induced by the conformal window are dominated by some low-order Lukosz modes. To optimize the dynamic correction, we can only correct dominant Lukosz modes and the image size can be minimized to reduce the time required to compute the metric function. In our experiment, a 37-channel DM is used to mimic the dynamic aberration of conformal window with scanning rate of 10 degrees per second. A 52-channel DM is used for correction. For a 128 × 128 image, the mean value of image sharpness during dynamic correction is 1.436 × 10−5 in optimized correction and is 1.427 × 10−5 in un-optimized correction. We also demonstrated that model-based WSLAO can achieve convergence two times faster than traditional stochastic parallel gradient descent SPGD method. View Full-Text

Keywords: conformal optics; dynamic aberration; adaptive optics; wavefront sensorless; deformable mirror conformal optics; dynamic aberration; adaptive optics; wavefront sensorless; deformable mirror





Autor: Bing Dong 1,* , Yan Li 2, Xin-li Han 1 and Bin Hu 2

Fuente: http://mdpi.com/



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