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多点协同动态散斑的统计特性

车东博 王挺峰 张绍 韩越 李远洋

车东博, 王挺峰, 张绍, 韩越, 李远洋. 多点协同动态散斑的统计特性[J]. 中国光学. doi: 10.37188/CO.2021-0152
引用本文: 车东博, 王挺峰, 张绍, 韩越, 李远洋. 多点协同动态散斑的统计特性[J]. 中国光学. doi: 10.37188/CO.2021-0152
CHE Dong-bo, WANG Ting-feng, ZHANG Shao, HAN Yue, YI Yuan-yang. Statistical characteristics of multi-channel cooperative dynamic speckle metric[J]. Chinese Optics. doi: 10.37188/CO.2021-0152
Citation: CHE Dong-bo, WANG Ting-feng, ZHANG Shao, HAN Yue, YI Yuan-yang. Statistical characteristics of multi-channel cooperative dynamic speckle metric[J]. Chinese Optics. doi: 10.37188/CO.2021-0152

多点协同动态散斑的统计特性

doi: 10.37188/CO.2021-0152
基金项目: 国家自然科学基金(No. 61805234);中国科学院前沿科学重点研究计划(No. QYZDB-SSWSLH014)
详细信息
    作者简介:

    车东博(1995—),女,吉林永吉人,博士研究生,2017年于东北师范大学物理学院获得学士学位,主要从事激光应用及光束控制方面的研究。E-mail: chedb839@163.com

    李远洋(1988—),男,吉林省长春人,博士,助理研究员,2016年于中科院长春光机所获博士学位,主要从事激光光束控制技术、主被动探测技术的研究

  • 中图分类号: TN249;V261.8

Statistical characteristics of multi-channel cooperative dynamic speckle metric

Funds: Supported by National Natural Science Foundation of China (No. 61805234); Key Research Program of Frontier Science, China, CAS (No. QYZDB-SSWSLH014)
  • 摘要: 为了提高动态散斑在目标在环系统中无损检测远场目标光斑质量的精度与效率,建立了多通道协同探测获取散斑信号的系统,并对回波散斑统计理论、多点协同仿真模型和空间时间频谱融合特性开展了研究。首先,利用单点探测器探测动态散斑的强度波动信号,对其进行滤波、自相关和傅里叶变换后获得散斑场的功率谱,再乘以权重获得散斑评价因子,探究该评价因子监视远场光斑的可行性。然后,提出对探测面不同空间位点获得的时间信号进行拼接的方法,并列举实现该方法的先决条件。最后,通过仿真与实验验证通过散斑场融合频谱获得评价因子的有效性。结果表明,动态散斑评价因子随目标光斑尺寸增加而减小,当探测面上4通道协同获取的信号不相关时,评价因子取平均可使精度提高2倍,而时间空间融合频谱获得的评价因子可保证精度的同时使系统带宽提高4倍。综上,多点协同获取的散斑评价因子可以更快速的监视远距离运动目标的光斑变化。
  • 图  1  散射点运动模型

    Figure  1.  The model of dynamic speckle

    图  2  TIL系统的光学布局图。出射激光复振幅A(r')通过均匀介质聚焦到目标靶面上,经粗糙表面散射后,回波由多个信号不相关的探测器接收。(a)目标粗糙表面直径为1.5 mm的聚焦光斑;(b)1.5 mm目标光斑对应的散斑光强;(c)目标粗糙表面直径为4 mm的聚焦光斑;(d)4 mm目标光斑对应的散斑光强。

    Figure  2.  TIL wave propagation configurations. Transmitted wave with complex amplitude A(r’) propagates in an optically homogeneous medium toward a target, and scattering off the target surface at the plane (r', z=L), the return wave propagates back to the multi-channel detectors. (a) The target focused spot with a diameter of 1.5 mm. (b) The speckle pattern corresponds to (a). (c) The target focused spot with a diameter of 4 mm. And (b) shows the speckle pattern corresponding to (c).

    图  3  动态散斑强度波动归一化互相关函数仿真结果。(a) 探测间距ρ=3 mm,仿真结果表明两组散斑时间波动相关性很好;(b)探测间距ρ=6 mm,两组信号互相关结果表现了明显的去相关性。

    Figure  3.  The simulation results of the dynamic speckles normalized cross-correlation function. (a) The distance between two detectors ρ=3 mm, the results show that the signals have a good correlation. (b) The signals show de-correlation where the distance between two detectors ρ=6 mm.

    图  4  根据点运动模型探测的动态散斑信号:(a)探测面一定孔径内的散斑强度波动信号 (b)目标光斑半径由0.2 mm逐步变为1.2 mm时,对应的散斑功率谱带宽逐渐缩短。

    Figure  4.  The dynamic speckle signals according to the model of the movement of scatters: (a) speckle signal fluctuations. (b) The frequency bandwidth of power spectra decreases as the target spot size changes from 0.2 mm to 1.2 mm.

    图  5  评价因子随目标光斑尺寸变化的仿真结果。目标光斑半径从0.2 mm变为1.2 mm,间隔0.01 mm。

    Figure  5.  Simulation result of the speckle-metric varying with the target spot size from 0.2 mm to 1.2 mm, with an interval of 0.01 mm.

    图  6  (a)蓝色曲线为单通道获得的时间频谱,红色曲线对应4通道获得的时间空间频谱。(b)四通道获得的归一化评价因子随目标光斑尺寸增加而降低,且时间频谱的单次采样数充足时,采样量对评价因子的影响不大。

    Figure  6.  (a) The blue curve is temporal spectrum obtained by a single-channel, and the red one corresponds to the spatio-temporal spectrum obtained by a four-channel. (b) The normalized speckle-metric obtained by four-channel decreases with the increase of the target spot size. What’s more, the speckle-metric is not significantly influenced by the number of samples when it is sufficient.

    图  7  激光经准直扩束和聚焦系统汇聚到旋转的粗糙目标靶面上,光束质量分析仪探测目标聚焦光斑的共轭面获得光斑的尺寸信息,携带着靶面信息的激光回波由两个焦距为10 cm的透镜汇聚到探测面,经两个Thorlabs单点探测器接收。实验测量的目标光斑半径变化为:0.4033 mm、0.4988 mm、0.6971 mm、0.9357 mm、1.060 mm到1.233 mm。

    Figure  7.  Laser propagates with an expander and focusing system toward a rotating target, and the beam profiler obtains the size of the target hit-spot by detecting the conjugate surface. Then the scattered light carrying the rough surface information forms an interference speckle pattern, which is focused by two lenses of f=10 cm on Thorlabs point detector surfaces. Set the target spot size as 0.4033 mm, 0.4988 mm, 0.6971 mm, 0.9357 mm, 1.060 mm and 1.233 mm.

    图  8  散斑强度频谱法实验结果,(a)和(b)中横坐标表示强度波动的频率,纵坐标为两个探测器获得的归一化时间频谱。(c)两个单点探测器获得的评价因子Jone实验结果,(d)对应两通道的实验结果取平均获得评价因子Jave和融合空间时间频谱的评价因子Jspt.

    Figure  8.  Experimental results of the speckle spectroscopy method. The horizontal coordinates in (a) and (b) indicate the frequency of intensity fluctuations, and the vertical coordinates are the normalized temporal spectra obtained from the two detectors. (c) Results of the speckle-metric Jone obtained by two point detectors, and (d) shows the speckle-metrics obtained by averaging the two-channel results (Jave) and the spatial-temporal spectrum (Jspt).

    表  1  拟合信息

    curveR2RMSE
    Jone0.98882.311
    Jave0.99721.123
    Jspt0.99492.909
    下载: 导出CSV
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  • 录用日期:  2021-11-03
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