A repository & source of cutting edge news about emerging terahertz technology, it's commercialization & innovations in THz devices, quality & process control, medical diagnostics, security, astronomy, communications, applications in graphene, metamaterials, CMOS, compressive sensing, 3d printing, and the Internet of Nanothings. NOTHING POSTED IS INVESTMENT ADVICE! REPOSTED COPYRIGHT IS FOR EDUCATIONAL USE.
Showing posts with label terahertz holography. Show all posts
Showing posts with label terahertz holography. Show all posts
Friday, February 2, 2018
Abstract-Towards the assessment of biomechanical interfaces: Topography of hidden objects obtained with THz holography
L. Valzania, P. Zolliker, E. Hack,
http://ieeexplore.ieee.org/document/8067016/
We report on the first steps towards THz imaging of biomechanical interfaces. A THz digital holography setup in reflection is used with synthetic aperture techniques to reconstruct the profile of a fingertip replica with a lateral resolution of 200 μm and a depth resolution of 20 μm. A method for the reconstruction of the profile of a sample hidden behind a THz-transparent material is also proposed. Experimental proof is provided by retrieving the bent profile of a metallic resolution target behind a Teflon plate.
Thursday, December 8, 2016
Research center physicist recognized by his peers
By NIKKI FICKEN AMRDEC
http://www.theredstonerocket.com/military_scene/article_ffedf934-bc80-11e6-bf22-2b921fd3b353.html
An Aviation and Missile Research, Development and Engineering Center employee has been named a Fellow of the American Association for the Advancement of Science, a distinction that recognizes his outstanding contributions in scientific research.
Dr. Henry Everitt, an AMRDEC physicist, is among 391 AAAS members elected by their peers to the rank of Fellow this year, one of two researchers employed by the Army. AAAS is the world’s largest multidisciplinary scientific society, with more than 120,000 members, and a leading publisher of cutting-edge research through its science family of journals. The AAAS seeks to “advance science, engineering and innovation throughout the world for the benefit of all people.”
“It is a tremendously humbling honor to be recognized by your peers for the work you do,” Everitt said. “I’m blessed to get paid for doing research, something I so much enjoy doing. My career has been about doing research in a variety of ways, including mentoring outstanding students and researchers and sponsoring top scientists and engineers around the world. Any successes I’ve had derive from their successes.”
He is one of the Army’s three dozen chief scientists, a senior executive “scientific technologist” who has worked for 25 years as a program manager, researcher and adviser on subjects as wide ranging as nanotechnology, photonics, ultrafast spectroscopy of semiconductor physics, quantum information, molecular spectroscopy and terahertz frequency holography and radar.
“Dr. Everitt has an extensive technical knowledge-base as represented in his numerous journal publications, book chapters, manuscripts and numerous technical reports,” Juanita Harris, AMRDEC Weapons Development and Integration Directorate director, said. “His guidance and strategic direction in the quantum networking activities allows the Army to lay out its strategic path in response to this very critical OSD initiative on quantum research. Dr. Everitt has proven himself time and time again to utilize his technical strengths to provide real world solutions to critical missile-based problems.”
In announcing the honor, AAAS recognized him “for pioneering spectroscopic investigations of wide bandgap semiconductors and ultraviolet plasmonic nanostructures, terahertz holography and nascent federal programs in quantum information, photonic crystals and nanotechnology.”
Because of his pioneering work in these fields, Everitt was previously selected as a Fellow of the Optical Society of America and the American Physical Society. He also holds adjunct faculty positions at several universities including Duke University, Rice University and the University of Alabama in Huntsville where he has taught classes and personally mentored more than 75 undergraduate researchers, graduate students and research scientists.
He and the other new Fellows will be presented with an official certificate and rosette pin on Feb. 18 at the AAAS Fellows forum during the 2017 AAAS annual meeting in Boston.
“As an Army scientist, my job and the purpose of my research is ultimately about service, service to my colleagues, service to the nation and especially service to the brave men and women in uniform who protect our freedoms,” Everitt said. “Selfless service is one of the Army’s core values, so it means a lot that AAAS recognizes Fellows for their ‘service to society.’ I hope I’ve done that.”
Tuesday, April 14, 2015
Abstract-Terahertz digital holography image denoising using stationary wavelet transform
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2275304
Shan-Shan Cui, Qi Li, Guanghao Chen
Harbin Institute of Technology (China)
Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 952230 (April 13, 2015); doi:10.1117/12.2182877
Terahertz (THz) holography is a frontier technology in terahertz imaging field. However, reconstructed images of holograms are inherently affected by speckle noise, on account of the coherent nature of light scattering. Stationary wavelet transform (SWT) is an effective tool in speckle noise removal. In this paper, two algorithms for despeckling SAR images are implemented to THz images based on SWT, which are threshold estimation and smoothing operation respectively. Denoised images are then quantitatively assessed by speckle index. Experimental results show that the stationary wavelet transform has superior denoising performance and image detail preservation to discrete wavelet transform. In terms of the threshold estimation, high levels of decomposing are needed for better denoising result. The smoothing operation combined with stationary wavelet transform manifests the optimal denoising effect at single decomposition level, with 5×5 average filtering. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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