NDLI: Phase-Sensitive Passive Terahertz Imaging at 5-m Stand-Off Distance

Content Provider	IEEE Xplore Digital Library
Author	Augustin, S. Hübers, H.-W.
Copyright Year	2011
Abstract	A novel imaging modality for passive THz scanners is described. The method relies on the phase-sensitive detection of THz radiation which is emitted or reflected from the object under investigation. A blackbody which is implemented in the imaging system provides a reference source. By alternate viewing of the scene and the reference source, phase-sensitive detection with a lock-in amplifier is realized. This enables simultaneous intensity and phase detection. Experiments which demonstrate the capabilities of the detection scheme have been performed with a passive THz scanner for stand-off detection at 5-m distance. The system operates at 345 GHz. When choosing the effective temperature of the reference source as the average of the object and its surroundings, only the edges of the object under investigation were detected in the intensity domain. This is hardware-based edge detection, in contrast to software-based edge detection where edges in an image are determined by a software algorithm. An additional advantage is the phase detection which effectively acts as a threshold detector and can improve the signal-to-noise ratio. Because only edges are detected in this scheme, it seems feasible that the privacy problem is relaxed or the privacy problem might be overcome.
Starting Page	418
Ending Page	424
Page Count	7
File Size	1110985
File Format	PDF
ISSN	2156342X
Volume Number	4
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Imaging Image edge detection Noise Mirrors Privacy Spatial resolution terahertz Hardware edge detection imaging phase-sensitive detection stand-off
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Radiation

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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