Diffuse reflection imaging at terahertz frequencies for security applications

2007 ◽  
Author(s):  
P. Dean ◽  
S. Khanna ◽  
S. Chakraborty ◽  
M. Lachab ◽  
A. G. Davies ◽  
...  
Keyword(s):  
Diffuse Reflection ◽  
Security Applications ◽  
Terahertz Frequencies ◽  
Reflection Imaging

Tunneling-assisted highly sensitive and stable lead-free Cs3Bi2I9 perovskite photodetectors for diffuse reflection imaging

2021 ◽  
Author(s):  
Wanjun Li ◽  
Yujin Liu ◽  
Yuxin Gao ◽  
Zhong Ji ◽  
Yong Fu ◽  
...  
Keyword(s):  
Diffuse Reflection ◽  
Lead Free ◽  
Active Materials ◽  
Highly Sensitive ◽  
Low Toxicity ◽  
Reflection Imaging

Lead-free perovskites exhibit low toxicity and have been investigated as new active materials for photoconversion applications.

Reducing current fluctuation of Cs3Bi2Br9 perovskite photodetectors for diffuse reflection imaging with wide dynamic range

2020 ◽  
Vol 65 (16) ◽  
pp. 1371-1379 ◽  
Author(s):  
Zhong Ji ◽  
Yujin Liu ◽  
Wanjun Li ◽  
Chuanxi Zhao ◽  
Wenjie Mai
Keyword(s):  
Diffuse Reflection ◽  
Dynamic Range ◽  
Wide Dynamic Range ◽  
Current Fluctuation ◽  
Reflection Imaging

TERAHERTZ INTERFEROMETRIC AND SYNTHETIC APERTURE IMAGING

2007 ◽  
Vol 17 (02) ◽  
pp. 431-443 ◽  
Author(s):  
ALEXANDER M SINYUKOV ◽  
APARAJITA BANDYOPADHYAY ◽  
AMARTYA SENGUPTA ◽  
ROBERT B BARAT ◽  
DALE E GARY ◽  
...  
Keyword(s):  
Synthetic Aperture ◽  
Imaging Method ◽  
Interferometric Imaging ◽  
Metal Object ◽  
Security Applications ◽  
Concealed Weapons ◽  
Continuous Waves ◽  
Theoretical Predictions ◽  
Terahertz Frequencies ◽  
Good Agreement

Experimental results of homodyne terahertz interferometric 1-D and 2-D imaging are presented. The reconstructed images of a point source are in a good agreement with theoretical predictions. The performance of an N element detector array is imitated by only one detector placed at N positions. Continuous waves at 0.25-0.3 THz are used to detect a metal object behind a barrier. 1-D images of a C-4 sample have been obtained at several terahertz frequencies. Focusing issues of 2-D imaging have been demonstrated. The terahertz interferometric imaging method can be used in defense and security applications to detect concealed weapons, explosives as well as chemical and biological agents.

scholarly journals Absorption-sensitive diffuse reflection imaging of concealed powders using a terahertz quantum cascade laser

2008 ◽  
Vol 16 (9) ◽  
pp. 5997 ◽  
Author(s):  
Paul Dean ◽  
Muhammad U. Shaukat ◽  
Suraj P. Khanna ◽  
Subhasish Chakraborty ◽  
Mohammad Lachab ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Diffuse Reflection ◽  
Quantum Cascade ◽  
Reflection Imaging

scholarly journals Recovering the superficial microvascular pattern via diffuse reflection imaging: phantom validation

2015 ◽  
Vol 14 (1) ◽  
Author(s):  
Chen Chen ◽  
Klämpfl Florian ◽  
Kanawade Rajesh ◽  
Riemann Max ◽  
Knipfer Christian ◽  
...  
Keyword(s):  
Diffuse Reflection ◽  
Reflection Imaging ◽  
Microvascular Pattern ◽  
Phantom Validation

Toward assessment of resection margins using hyperspectral diffuse reflection imaging (400–1,700 nm) during tongue cancer surgery

2019 ◽  
Vol 52 (6) ◽  
pp. 496-502 ◽  
Author(s):  
Susan G. Brouwer de Koning ◽  
Pim Weijtmans ◽  
M. Baris Karakullukcu ◽  
Caifeng Shan ◽  
Elisabeth J. M. Baltussen ◽  
...  
Keyword(s):  
Diffuse Reflection ◽  
Tongue Cancer ◽  
Cancer Surgery ◽  
Resection Margins ◽  
Reflection Imaging

scholarly journals Diffuse reflection imaging of sub-epidermal tissue haematocrit using a simple RGB camera

2007 ◽  
Author(s):  
Martin J. Leahy ◽  
Jim O'Doherty ◽  
Paul McNamara ◽  
Joakim Henricson ◽  
Gert E. Nilsson ◽  
...  
Keyword(s):  
Diffuse Reflection ◽  
Epidermal Tissue ◽  
Reflection Imaging

FPGA Implementation of MC-CDMA for High Security Applications

2013 ◽  
Vol 5 (1) ◽  
pp. 36-41
Author(s):  
R. Ganesh ◽  
◽  
Ch. Sandeep Reddy ◽  
Keyword(s):  
Fpga Implementation ◽  
Security Applications ◽  
High Security

A New Image Encryption Scheme Using Dual Chaotic Map Synchronization

2020 ◽  
Vol 18 (1) ◽  
Keyword(s):  
Image Encryption ◽  
Chaotic Systems ◽  
Initial Conditions ◽  
Chaotic Map ◽  
Security Applications ◽  
The Common ◽  
And Diffusion ◽  
Confusion And Diffusion ◽  
Sensitivity To Initial Conditions ◽  
Diffusion Properties

Chaotic systems behavior attracts many researchers in the field of image encryption. The major advantage of using chaos as the basis for developing a crypto-system is due to its sensitivity to initial conditions and parameter tunning as well as the random-like behavior which resembles the main ingredients of a good cipher namely the confusion and diffusion properties. In this article, we present a new scheme based on the synchronization of dual chaotic systems namely Lorenz and Chen chaotic systems and prove that those chaotic maps can be completely synchronized with other under suitable conditions and specific parameters that make a new addition to the chaotic based encryption systems. This addition provides a master-slave configuration that is utilized to construct the proposed dual synchronized chaos-based cipher scheme. The common security analyses are performed to validate the effectiveness of the proposed scheme. Based on all experiments and analyses, we can conclude that this scheme is secure, efficient, robust, reliable, and can be directly applied successfully for many practical security applications in insecure network channels such as the Internet

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