Depth of focus extension by filtering in the frequency domain in laser frequency-shifted feedback imaging

Lu Yueyue; Zhu Kaiyi; Li Jiyang; Zhang Shulian; Tan Yidong

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Depth of focus extension by filtering in the frequency domain in laser frequency-shifted feedback imaging

机译：通过在激光频移反馈成像中滤除频域中的焦点扩展深度

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The depth of focus extension in optical imaging is of considerable interest. In this paper, a laser frequency-shifted feedback scanning imaging configuration is demonstrated whose depth of focus is greatly extended through numerical filtering. The transmission characteristics of the system are studied. The original image is acquired through a two-dimensional scanning point by point with the target placed on a defocused plane. Filtered in the frequency domain, images on any oriented plane can be refocused. The superior performances are presented by imaging a three-dimensional target, and the process of gradual refocusing is demonstrated. To obtain the maximum extension in the depth of defocus, a series of numerical experiments has been carried out, which reveals its depth of focus is capable of being extended to four times the length of the objective focus length. The fabulous performances can motivate three-dimensional surface profile measurement. (C) 2018 Optical Society of America

机译：光学成像中的聚焦扩展深度具有相当大的兴趣。在本文中，演示了激光频移反馈扫描成像配置，其焦点通过数值滤波大大延伸。研究了系统的传输特性。通过将目标放置在散焦平面上的目标通过二维扫描点获取原始图像。在频域中过滤，可以重新分段出面的任何定向平面上的图像。通过成像三维目标来呈现优异的性能，并且证明了逐渐重新分离的过程。为了获得散热深度的最大延伸，已经进行了一系列数值实验，这揭示其焦点能够延伸到目标焦距长度的四倍。神话般的表演可以激励三维表面轮廓测量。（c）2018年光学学会

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来源
《Applied optics》 |2018年第20期|共8页
作者
Lu Yueyue; Zhu Kaiyi; Li Jiyang; Zhang Shulian; Tan Yidong;
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作者单位

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

Tsinghua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol &

Instru Beijing 100084 Peoples R China;

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正文语种 eng
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Depth of focus extension by filtering in the frequency domain in laser frequency-shifted feedback imaging

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