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提出了菲涅耳波带板(FZP)无运动卷积偏振选通全息术,该技术的原理与菲涅耳波带板扫描全息术相同,但在成像系统结构上作了重大改进,改进内容主要有两个方面:第一,使用扩展光源,用多个菲涅耳波带板在物体上的投影叠加形成卷积运算来取代机械扫描,克服了扫描造成的系统不稳定性和限制实际应用的耗时问题;第二,用CCD取代光电倍增管,使物体上所有的点都同时成像在CCD靶面上,达到实时采集整个全息图的目的。对线偏振光和圆偏振光经过散射介质脂肪乳剂(Intralipid)溶液后偏振度的变化规律进行了实验研究,研究表明,在米氏散射区,圆偏振光比线偏振光更容易保持偏振态。应用菲涅耳波带板无运动卷积偏振选通成像系统,采用圆偏振光作为入射光,对嵌埋在浓度为1%、深度为2 cm的脂肪乳剂溶液中的金属丝(直径0.4 mm)进行了成像实验,结果表明,菲涅耳波带板无运动卷积偏振选通全息术原理是可行的。
A FZP motionless convolution polarization gated holography is proposed. The principle of this technique is the same as that of the Fresnel zone plate scanning holography. However, significant improvements have been made in the structure of the imaging system to improve the content There are mainly two aspects: First, the use of extended light source, the use of multiple Fresnel zone plate projection superimposed on the object form a convolution operation to replace the mechanical scanning, to overcome the system instability caused by the scan and limit the practical application Of the time-consuming problem; Second, replace the photomultiplier tube with a CCD so that all the points on the object are simultaneously imaged on the CCD target surface, to achieve the purpose of real-time acquisition of the entire hologram. The polarization of linearly polarized light and circularly polarized light passing through the Intralipid scattering medium was studied experimentally. The results show that circularly polarized light is easier to maintain the polarization state than the linearly polarized light in the Mie scattering region. The Fresnel zone plate motionless convolution polarizer gated imaging system was used. The circularly polarized light was used as the incident light. The diameter of the wire (0.4 mm in diameter) embedded in a fat emulsion solution with a concentration of 1% and a depth of 2 cm ) Imaging experiments were carried out. The results show that the Fresnel zone slab motionless convolution polarization gating holography principle is feasible.