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Sensors 2016, 16(9), 1414; doi:10.3390/s16091414

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

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
Received: 21 June 2016 / Revised: 17 August 2016 / Accepted: 22 August 2016 / Published: 2 September 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4719 KB, uploaded 2 September 2016]   |  

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
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Dong, B.; Li, Y.; Han, X.-L.; Hu, B. Dynamic Aberration Correction for Conformal Window of High-Speed Aircraft Using Optimized Model-Based Wavefront Sensorless Adaptive Optics. Sensors 2016, 16, 1414.

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