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首页> 外文期刊>Optical engineering >Modeled and measured image-plane polychromatic speckle contrast
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Modeled and measured image-plane polychromatic speckle contrast

机译：建模和测量的图像平面多色斑点对比度

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摘要

The statistical properties of speckle relevant to short- to medium-range (tactical) active tracking involving polychromatic illumination are investigated. A numerical model is developed to allow rapid simulation of speckled images including the speckle contrast reduction effects of illuminator bandwidth, surface slope, and roughness, and the polarization properties of both the source and the reflection. Regarding surface slope (relative orientation of the surface normal and illumination/observation directions), Huntley's theory for speckle contrast, which employs geometrical approximations to decrease computation time, is modified to increase accuracy by incorporation of a geometrical correction factor and better treatment of roughness and polarization. The resulting model shows excellent agreement with more exact theory over a wide range. An experiment is conducted to validate both the numerical model developed here and existing theory. A diode laser source with coherence length of 259 ± 7 μm is reflected off of a silver-coated diffuse surface. Speckle data are gathered for 16 surface slope angles corresponding to speckle contrast between about 0.55 and 1. Taking the measured data as truth, both equations show error mean and standard deviation of less than 3%. Thus, the theory is validated over the range of this experiment.
机译：研究了与涉及多色照明的中短程（战术）主动跟踪有关的散斑的统计特性。建立了一个数值模型，可以对斑点图像进行快速仿真，包括减少照明器带宽，表面倾斜度和粗糙度的斑点对比度，以及光源和反射的偏振特性。关于表面坡度（表面法线和照明/观察方向的相对方向），亨特利的散斑对比度理论采用几何近似来减少计算时间，并通过结合几何校正因子并更好地处理粗糙度和粗糙度来改进准确性。偏振。生成的模型在更广泛的范围内显示出与更精确的理论极好的一致性。进行实验以验证此处开发的数值模型和现有理论。相干长度为259±7μm的二极管激光源从镀银的漫射表面反射回来。针对对应于大约0.55和1之间的斑点对比度的16个表面倾斜角度，收集斑点数据。以测量数据为真，两个方程式的均值和标准偏差均小于3％。因此，该理论在本实验的范围内得到了验证。

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  • 来源
    《Optical engineering》 |2016年第2期|024106.1-024106.7|共7页
  • 作者

    Noah R. Van Zandt; Jack E. McCrae; Steven T. Fiorino;

  • 作者单位

    Air Force Institute of Technology, Center for Directed Energy, Department of Engineering Physics, 2950 Hobson Way, Dayton, Ohio 45433, United States;

    Air Force Institute of Technology, Center for Directed Energy, Department of Engineering Physics, 2950 Hobson Way, Dayton, Ohio 45433, United States,Oak Ridge Institute for Science and Education, 1299 Bethel Valley Road, Oak Ridge, Tennessee 37380, United States;

    Air Force Institute of Technology, Center for Directed Energy, Department of Engineering Physics, 2950 Hobson Way, Dayton, Ohio 45433, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coherent optical effects; partial coherence in imaging; roughness; speckle; speckle imaging;

    机译：相干光学效应成像中的部分相干;粗糙度斑点;斑点成像;

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