Dual-wavelength image-plane digital holography for dynamic measurement

Dual-wavelength image-plane digital holography for dynamic measurement
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用于动态测量的双波长像面数字全息术

DOI:
10.1016/j.optlaseng.2008.10.002
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发表时间:
2009-05
影响因子:
4.6
通讯作者:
--
中科院分区:
工程技术2区
文献类型:
--
作者:

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本文提出了一种双波长像面数字全息术与窗口傅里叶分析相结合的方法,用于振动物体的动态测量。为了扩大速度测量范围,用两束不同波长的激光同时照射物体。用CCD摄像机拍摄振动物体的数字全息图序列,并从每个数字全息图中提取两个包裹的相位图。在每一时刻,通过减去这两个包裹的相位图来获得具有合成波长的新的相位分布。然后,在空间和时间上应用窗口傅立叶分析来检索被测对象的高精度位移和速度。实验结果表明,该方法降低了对摄像机采集频率的要求.
A dual-wavelength image-plane digital holography, combined with a windowed Fourier analysis, is presented for dynamic measurement of a vibrating object. In order to expand the range of the velocity measurement, the object is simultaneously illuminated by two lasers with different wavelengths. A sequence of digital holograms of a vibrating object is captured by a CCD camera and two wrapped phase maps are retrieved from each digital hologram. At each instant, a new phase distribution with a synthetic wavelength is obtained by subtracting these two wrapped phase maps. A windowed Fourier analysis is then applied spatially and temporally to retrieve the high-precision displacement and velocity of the tested object. Experimental results show the requirement on the camera capture frequency is reduced by the proposed method.
DOI: 10.1364/ao.34.004740
发表时间: 1995-08
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影响因子: 1.9
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