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Development of Low Coherence Digital Holography Based on Single-Exposure Phase-Shifting Digital Holography

基于单次曝光相移数字全息的低相干数字全息的研制

基本信息

批准号：
18560035
负责人：
NOMURA Takanori
金额：
$ 2.5万
依托单位：
Wakayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Measurement of a profile and reflectance property using low-coherence digital holography has been proposed. A number of digital holograms recorded by a low-coherence digital holography are used to calculate the profile and reflectance property of the object. We call the reconstructed images from the digital holograms, series of reconstructed images. The highest point corresponds to the number of series of the reconstructed images which as maximum pixel value. The profile is obtained from the numbers. The reflectance property corresponds the maximum pixel value for same position in each reconstructed images. To improve the accuracy of the measurement, we propose reduction of noise effect. In the proposed methods, the effect of speckles is dominant. To reduce it, statistical methods and the method by the wavelength profile of a light source are presented. By applying the proposed methods, the accuracy of measurement has been improved. Furthermore, the measurement of the object within the scattering media has been shown to confirm our proposed method.For the one-shot phase-shifting method, two types of wavefront-splitting phase-shifting digital holography have been proposed. One is the method using an analyzer array and another is the method using a retarder array. Simulational experimental results are shown to confirm the one-shot phase-shifting digital holography using an analyzer array. By the experiments using a polarization imaging camera, the one-shot recording of the phase-shifting digital hologram has been accomplished.

提出了一种用低相干数字全息术测量物体轮廓和反射特性的方法。使用低相干性数字全息术记录的大量数字全息图来计算物体的轮廓和反射特性。我们将从数字全息图中再现的图像称为一系列再现图像。最高点对应的是作为最大像素值的重建图像序列的个数。个人资料是从数字中获得的。反射率属性对应于每个重建图像中相同位置的最大像素值。为了提高测量的准确性，我们提出了降低噪声影响的建议。在所提出的方法中，斑点的影响占主导地位。为了减少这种影响，提出了统计方法和利用光源波长分布的方法。通过应用所提出的方法，提高了测量精度。对于单次相移法，提出了两种波前分裂相移数字全息术。一种是使用分析器阵列的方法，另一种是使用延迟器阵列的方法。仿真实验结果证实了采用分析器阵列的单次相移数字全息术。通过使用偏振成像相机的实验，实现了相移数字全息图的一次记录。