Continuous-wave terahertz scanning image resolution analysis and restoration

被引：11
作者：
Li, Qi [1 ]
Yin, Qiguo [1 ]
Yao, Rui [1 ]
Ding, Shenghui [1 ]
Wang, Qi [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Tunable Laser Technol, Inst Optoelect, Heilongjiang 150081, Peoples R China
来源：
OPTICAL ENGINEERING | 2010年 / 49卷 / 03期
关键词：
continuous-wave terahertz image; image resolution; image restoration; Richardson-Lucy algorithm;
D O I：
10.1117/1.3366650
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Resolution of continuous-wave (CW) terahertz scanning image is limited by many factors among which the aperture effect of finite focus diameter is very important. We have investigated the factors that affect terahertz (THz) image resolution in details through theory analysis and simulation. On the other hand, in order to enhance THz image resolution, Richardson-Lucy algorithm has been introduced as a promising approach to improve image details. By analyzing the imaging theory, it is proposed that intensity distribution function of actual THz laser focal spot can be approximatively used as point spread function (PSF) in the restoration algorithm. The focal spot image could be obtained by applying the pyroelectric camera, and mean filtering result of the focal spot image is used as the PSF. Simulation and experiment show that the algorithm implemented is comparatively effective. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3366650]
引用
收藏
页数：5
相关论文
共 20 条
  • [1] Acceleration of iterative image restoration algorithms
    Biggs, DSC
    Andrews, M
    [J]. APPLIED OPTICS, 1997, 36 (08): : 1766 - 1775
  • [2] Continuous-wave terahertz system with a 60 dB dynamic range
    Gregory, IS
    Tribe, WR
    Baker, C
    Cole, BE
    Evans, MJ
    Spencer, L
    Pepper, M
    Missous, M
    [J]. APPLIED PHYSICS LETTERS, 2005, 86 (20) : 1 - 3
  • [3] FAR INFRARED IMAGERY
    HARTWICK, TS
    HODGES, DT
    BARKER, DH
    FOOTE, FB
    [J]. APPLIED OPTICS, 1976, 15 (08): : 1919 - 1922
  • [4] HATTORI T, 2005, P JOINT 30 INT C INF, V2, P333
  • [5] HUANG L, 2006, P SOC PHOTO-OPT INS, V6149, P321
  • [6] Comparison between pulsed terahertz time-domain imaging and continuous wave terahertz imaging
    Karpowicz, N
    Zhong, H
    Xu, JZ
    Lin, KI
    Hwang, JS
    Zhang, XC
    [J]. SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 2005, 20 (07) : S293 - S299
  • [7] Compact continuous-wave subterahertz system for inspection applications
    Karpowicz, N
    Zhong, H
    Zhang, CL
    Lin, KI
    Hwang, JS
    Xu, JZ
    Zhang, XC
    [J]. APPLIED PHYSICS LETTERS, 2005, 86 (05) : 1 - 3
  • [8] KARPOWICZ N, 2005, P JOINT 30 INT C INF, V1, P329
  • [9] Lanteri H., 1994, SPIE, V2312, P182
  • [10] Li Q., 2009, P SPIE, V7277
12