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首页> 外文期刊>The Astrophysical journal >SPECKLE DECORRELATION AND DYNAMIC RANGE IN SPECKLE NOISE-LIMITED IMAGING
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SPECKLE DECORRELATION AND DYNAMIC RANGE IN SPECKLE NOISE-LIMITED IMAGING

机译：散斑噪声成像中的散斑去相关和动态范围

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摘要

The useful dynamic range of an image in the diffraction-limited regime is usually limited by speckles caused by residual phase errors in the optical system forming the image. The technique of speckle decorrelation involves introducing many independent realizations of additional phase error into a wave front during one speckle lifetime, changing the instantaneous speckle pattern. A commonly held assumption is that this results in the speckles being "moved around" at the rate at which the additional phase screens are applied. The intention of this exercise is to smooth the speckles out into a more uniform background distribution during their persistence time, thereby enabling companion detection around bright stars to be photon noise limited rather than speckle limited. We demonstrate analytically why this does not occur and confirm this result with numerical simulations. We show that the original speckles must persist and that the technique of speckle decorrelation merely adds more noise to the original speckle noise, thereby degrading the dynamic range of the image.
机译：图像在衍射受限状态下的有用动态范围通常受形成图像的光学系统中残留相位误差引起的斑点限制。散斑去相关技术涉及在一个散斑寿命期间将许多附加的相位误差的独立实现引入波前，从而改变瞬时散斑模式。通常认为，这会导致斑点以施加附加相位屏蔽的速率“运动”。此练习的目的是在斑点持续期间将斑点平滑成更均匀的背景分布，从而使亮星周围的同伴检测受光子噪声限制而不是受斑点限制。我们通过分析证明了为什么不会发生这种情况，并通过数值模拟证实了这一结果。我们表明原始斑点必须持续存在，并且斑点去相关技术只会将更多噪声添加到原始斑点噪声中，从而降低图像的动态范围。

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