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2 edition of An experimental microwave imaging system using pre-formed beams found in the catalog.

An experimental microwave imaging system using pre-formed beams

by Robert Allan Litten

  • 325 Want to read
  • 29 Currently reading

Published by Naval Postgraduate School in Monterey, Calif .
Written in English


About the Edition

An experimental einvestigation of microwave imaging using preformed beams is made at a frequency of 24 gigahertz. The apparatus consists of a 1.5 meter diameter parabolic reflector with a mosaic of detectors at the focal plane. The detector outputs are amplified and stored to provide a set of d.c. voltages, proportional to the energy received at points in the image plane, to be applied to an intensity modulated display. Using microwave antenna and optical principles, the theory of image formation and resolution is discussed. The range capability is predicted by the radar range equation, using measured parameters. Advantages of the systemm with respect to conventional scanning radar appear for fast moving objects at close range.

Edition Notes

StatementRobert Allan Litten
ContributionsNaval Postgraduate School (U.S.)
The Physical Object
Pagination58 p. :
Number of Pages58
ID Numbers
Open LibraryOL25200378M
OCLC/WorldCa188043437

Microwave Imaging Model Tomography is a transmission-reflection imaging method using numerous antennas surrounding an object being imaged, in this case the breast. The shape of the target and dimensional distribution of the permittivity are acquired from the . Microwave Imaging via Space-Time Beamforming for Early Detection of Breast Cancer Essex J. Bond, Student Member, IEEE,XuLi, Student Member, IEEE, Susan C. Hagness, Member, IEEE, and Barry D. Van Veen, Fellow, IEEE Abstract— A method of microwave imaging via space-time (MIST) beamforming is proposed for detecting early-stage breast cancer.

Start studying imaging 1. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. average beam energy, beam intensity, and the amount of scatter produced When digital imaging systems, the primary factors affecting final image contrast are . Using the laser to read the imaging plate wavelength of beam is. nm, or to nm for solid-state. Reader scans the plate with red light in a. zigzag or raster pattern. Digital imaging systems have a dynamic range from. to different shades of gray.

Abstract. At the RADEN beam line of the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex, we combine cutting-edge, event-type imaging detectors with a high-intensity, pulsed neutron beam to perform energy-resolved neutron imaging. Methods. In these experiments, we integrated our novel three-point steering (3PS) system [] for scanning an ultrasound beam with the data acquisition portion of a microwave imaging system to monitor temperature distributions generated in a gel phantom l Omega (Stamford, CT) thermocouples were embedded in the gel to measure the actual temperature for validation purposes.


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An experimental microwave imaging system using pre-formed beams by Robert Allan Litten Download PDF EPUB FB2

0>7 l ci ABSTRACT Anexperimentalinvestigationofmicrowaveimagingusing preformedbeamsismadeatafrequencyof24gigahertz(9\=cm). Theapparatusconsistsofa1. While some free-space facilities exist that can characterize down to MHz, the method is most useful for characterizing materials from 2 GHz through millimeter waves.

This book is designed to acquaint engineers and scientists with the theory and practice of using microwave focused beam systems for free-space characterization of materials.5/5(3). Approved for public release; distribution is unlimitedAn experimental investigation of microwave imaging using preformed beams is made at a frequency of 24 gigahertz.

The apparatus consists of a meter diameter parabolic reflector with a mosaic of detectors at the focal : Robert Allan Litten.

Abstract: The Holographic Microwave Imaging system is an active microwave imaging based on radar technique. Previous works have investigated its capability to detect tumors from early breast cancer. The results demonstrate a proper image reconstruction with different algorithms focused on near-field and far-field conditions.

by an X-band microwave array 3-D imaging system. The experimental results demonstrate that the compressed sensing approach can produce a better resolution 3-D image of the observed scatterers compared with the conventional method, especially in the case of very sparse activate antenna array.

Figure 1. Microwave imaging systems for breast cancer diagnosis In active systems, the sensing is accomplished by probing the biological object with self-generated energy. In passive systems, on the other hand, this energy is generated by the object. Active microwave imaging, in turn, can be divided into microwave tomography and ultrawideband (UWB).

Another system, for 3D microwave imaging, by Semenovet built around a larger metallic chamber and with a network analyzer as a transceiver [32]. In this system only two waveguide antennas are used, both tuned to operate in salt solutions at a frequency range between and 1 GHz. Experiment 4: Refraction and Interference with Microwaves 2 waves formed at the interface.

Therefore, because we know that f c n, (is wavelength) we can conclude that in the refractive region the wavelength is decreased such that 0 n (2) Here, 0 is the vacuum wavelength. A custom experimental system was developed to fracture silicon microcantilever beams in side loading (i.e., the load was applied in the noncompliant direction), and the resulting force/deflection.

I am working on a project that involves possibly the use of microwaves (RF) to make a system that is basically a short range (under 40 feet) point-to-point link security style system. Very basic with a transmitter and receiver on each end. The idea is to be able to detect when this narrow RF beam is broken by an intrusion.

imaging. INTRODUCTION Microwave imaging techniques are used to probe inaccessible domains and to reveal the dielectric properties of the media that they penetrate [1]. Microwave imaging based techniques have found a variety of applications such as medical diagnosis [2,3], concealed weapon detection [4], food and agricultural applications [1].

Open Access Article. A Prototype Microwave System for 3D Brain Stroke Imaging. by Jorge A. Tobon Vasquez, Rosa Scapaticci, Giovanna Turvani, Gennaro Bellizzi, David O. Rodriguez-Duarte, Nadine Joachimowicz, Bernard Duchêne, Enrico Tedeschi, Mario R. Casu.

Using microwave as the medium, SMM measures electromagnetic interactions of the microwave from a sharp probe or aperture with the sample under test on a scale that is significantly less than the wavelength of the radiation.2 STM or AFM based SMM typically uses a metal or metal-coated probe in-line with a coaxial resonator.

Materials properties. In a US-French consortium demonstrated an experimental microwave relay link across the English Channel using 10 foot (3m) dishes, one of the earliest microwave communication systems. Telephony, telegraph and facsimile data was transmitted over the GHz beams 40 miles between Dover, UK and Calais, France.

Abstract. In this chapter a review of different electromagnetic (EM) imaging methods is presented. The focus on microwave tomography, the types, and advantages and disadvantages of local and global optimization in microwave imaging are reviewed. A microwave imaging system based on a heterodyne interferometer has been developed to measure the spatial distribution of the plasma density without introducing any direct disturbance to the plasma by employing a diode array scattering technique.

The imaging system with the use of a fan beam microwave for a radar system demonstrates the principle of the technique by. Abstract—In this paper we present a prototype of a Microwave Imaging (MI) system for breast cancer detection.

Our system is based on low-cost off-the-shelf microwave components, custom-made antennas, and a small form-factor processing system with an embedded Field-Programmable Gate Array (FPGA) for accelerating the execution of the imaging. Nanolithography outlines the present state of the art in lithographic techniques, including optical projection in both deep and extreme ultraviolet, electron and ion beams, and imprinting.

Special attention is paid to related issues, such as the resists used in lithography, the masks (or lack thereof), the metrology needed for nano-features.

Computational Microwave Imaging Using 3D Printed Conductive Polymer Frequency-Diverse Metasurface Antennas Okan Yurduseven 1*, Patrick Flowers2, Shengrong Ye2, Daniel L. Marks1, Jonah N. Gollub, Thomas Fromenteze3, 2Benjamin J. Wiley, and David R. Smith1 1Center for Metamaterials and Integrated Plasmonics and Department of Electrical and Computer Engineering, Duke University.

In order to evaluate the performance of the DTA-BIM method in a realistic microwave imaging system, an experimental prototype of an active 3D microwave imaging system with movable antennas is.

fect of undesired scatterers, using an existing Bessel beam launcher to create a confined NF distribution in free space. 1 Introduction Microwave imaging (MWI) is an imaging technique using which we can obtain the dielectric profile (and/or magnetic profile) of the object of interest (OI) in a non-destructive fashion.A directed-energy weapon (DEW) is a ranged weapon that damages its target with highly focused energy, including laser, microwaves and particle ial applications of this technology include weapons that target personnel, missiles, vehicles, and optical devices.

In the United States, the Pentagon, DARPA, the Air Force Research Laboratory, United States Army Armament Research.This letter presents a design of a principal component analysis (PCA)-based microwave compressive sensing system using reconfigurable array.

An iterative beam synthesis process is used to realize.