FZP扫描全息术用于高散射介质中吸收体成像
Imaging of Absorbers Embedded in Highly Scattering Media Using Fresnel Zone Plate Scanning Holography
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摘要: 设计以菲涅耳波带板作为编码孔径的近红外扫描全息成像系统,并对该系统的点扩散函数进行了理论计算.结果表明:系统的点扩散函数接近理想的δ函数;实际测试了系统的点扩散函数,分析了实验结果与理论计算值存在差异的原因;用该系统对浓度为1%、深度为1.8cm的intralipid脂肪乳剂中嵌埋直径分别为1.5mm,1.0mm和0.4mm的金属丝做成的圆环进行了成像实验.实验结果表明:可较清晰地分辨直径1.5mm和1.0mm金属丝做成的圆环,对直径0.4mm的金属丝做成的圆环也可识别.该系统用于高散射介质中吸收体成像具Abstract: A near infrared imaging system of Fresnel zone plate scanning holography is proposed and the system point spread function calculated. The calculation shows that the system point spread function is quite close to the Dirac delta function. Differences between the experimental results and the theoretical calculation of the system point spread function are analyzed. Experiments in which three metal rings with wire diameter of 1 5 mm, 1 0 mm and 0 4 mm respectively, embedded in a 1% intralipid solution are imaged using the system demonstrated that the reconstruction of the two metal rings with wire diameters of 1 5 mm and 1 0 mm are clear and the reconstructions of the metal ring with wire diameter of 0 4 mm can also be distinguished from the noise. The system is thus shown by experiments to be workable in imaging absorbers embedded in a highly scattering turbid media.
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