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太赫兹伽栢同轴数字全息自动聚焦研究

Autofocusing Research on Terahertz Gabor Inline Digital Holography

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摘要

太赫兹数字全息是太赫兹成像技术的重要研究方向。由于太赫兹波长相对较长,使得太赫兹同轴数字全息的记录距离一般都比较近,因此系统记录距离的准确测量意义重大。对真实2.52 THz伽栢同轴数字全息图应用5种自动聚焦判别函数,通过截取再现像目标提高了判别精度。实验结果表明归一化方差判据函数最好,证明了5种自动聚焦判别函数应用于太赫兹同轴数字全息的可行性。

Abstract

Terahertz (THz) digital holography is an important research aspect of terahertz imaging technology. The recording distance of terahertz digital holography is generally short because of the long wavelength and restriction of the detector. The exact measurement of the real recording distance is of great significance. Autofocusing researches have been made on real 2.52 THz Gabor inline digital holograms based on five kinds of autofocusing criterion functions. The criterion precision is improved by cropping object in the reconstructed images. The experimental results show that the performance of normalized variance criterion function is the best. The results verify the feasibility of applying five kinds of autofocusing criterion functions to terahertz inline digital holography.

Newport宣传-MKS新实验室计划
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中图分类号:TN29

DOI:10.3788/aos201434.s111001

所属栏目:成像系统

基金项目:国家自然科学基金(61377110)、高等学校博士学科点专项科研基金(20112302110028)

收稿日期:2014-01-22

修改稿日期:2014-02-26

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作者单位    点击查看

李琦:哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150080
胡佳琦:哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150080
李运达:哈尔滨工业大学可调谐激光技术国家级重点实验室, 黑龙江 哈尔滨 150080

联系人作者:李琦(liqi2013@hit.edu.cn)

备注:李琦(1963—),女,博士,教授,主要从事激光与太赫兹成像及图像处理等方面的研究。

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引用该论文

Li Qi,Hu Jiaqi,Li Yunda. Autofocusing Research on Terahertz Gabor Inline Digital Holography[J]. Acta Optica Sinica, 2014, 34(s1): s111001

李琦,胡佳琦,李运达. 太赫兹伽栢同轴数字全息自动聚焦研究[J]. 光学学报, 2014, 34(s1): s111001

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