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Articles 361 - 370 of 370

Full-Text Articles in Electrical and Computer Engineering

Neural Control Of Smart Electromagnetic Structures, Michael Thursby, Kisuck Yoo, Barry G. Grossman Dec 1991

Neural Control Of Smart Electromagnetic Structures, Michael Thursby, Kisuck Yoo, Barry G. Grossman

Electrical Engineering and Computer Science Faculty Publications

Artificial neural networks (ANNs) and their ability to model and control dynamical systems for smart structures, including sensors, actuators, and plants, are directly applicable to the smart electromagnetic structures (SEMS) concept. The application of neural networks to the area of controls is being reported frequently. The ability of a structure to adapt to impinging electromagnetic (EM) energy will allow the structure to change its reflection characteristics and thus to change its radar signature. By embedding a control element in the structure of a single microstrip patch element, its electrical characteristics can be changed. If such an element can be controlled …

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Optical Processors For Smart Structures, Barry G. Grossman, Howard Hou, Ramzi H. Nassar Sep 1990

Optical Processors For Smart Structures, Barry G. Grossman, Howard Hou, Ramzi H. Nassar

Electrical Engineering and Computer Science Faculty Publications

For underwater fiber-optic sensor arrays containing hundreds of sensors as well as smart aerospace structures and skins using fiber-optic strain sensor arrays, the output of the sensors are optical signals that are a function of the measurand. We are also employing optical signals to energize smart-structure actuators (shape-memory alloys). An all-optical processor would thus seem to be logical choice for the processor since we must simultaneously process, in real time, multiple optical input (sensor) signals and generate multiple output (actuator) signals. In addition, with an all-optical processor, there would be no reduction in processor performance due to converting between optical …

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Experimental Performance Of A Binary Phase-Only Optical Correlator Using Visual And Infrared Imagery, Samuel Peter Kozaitis, Sandra L. Halby, Wesley E. Foor Sep 1990

Experimental Performance Of A Binary Phase-Only Optical Correlator Using Visual And Infrared Imagery, Samuel Peter Kozaitis, Sandra L. Halby, Wesley E. Foor

Electrical Engineering and Computer Science Faculty Publications

Experimental results of an optical binary phase-only correlator using both visual and IR imagery are presented. The inputs to the correlator originate from actual aerial imagery containing aircraft and a variety of distortions. Filters used as a database for the system are derived from models of aircraft. Digital image processing techniques are used on images before being input into the optical correlator to enhance the performance of the system. Both noise removing and segmentation techniques are investigated. Input images to the correlator are displayed on a 128×128 magneto-optic spatial light modulator (SLM). Experimental results are presented which show that the …

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Processing Of One-Fiber Interferometric Fiber-Optic Sensor Signals, A. Tino Alavie, Barry Grossman, Michael Thursby Feb 1990

Processing Of One-Fiber Interferometric Fiber-Optic Sensor Signals, A. Tino Alavie, Barry Grossman, Michael Thursby

Electrical Engineering and Computer Science Faculty Publications

Recent research conducted in the Fiber -Optic Sensor Systems Laboratory at Florida Institute of Technology in fiber -optic strain sensors for use in smart structures has concentrated primarily on one -fiber interferometers. Sensors using this technique are of particular interest because they are rugged and provide reasonable strain sensitivities, typically a thousand times that of microbend sensors, while requiring only a single optical fiber. As in two -fiber interferometers, some method must be used to convert the sensor signal output to an absolute strain value. One technique is to provide active phase tracking to keep the sensor signal output at …

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Fiber-Optic Sensor And Smart Structures Research At Florida Institute Of Technology, Barry Grossman, Tino Alavie, Fred Ham, Jorge Franke, Michael Thursby Feb 1990

Fiber-Optic Sensor And Smart Structures Research At Florida Institute Of Technology, Barry Grossman, Tino Alavie, Fred Ham, Jorge Franke, Michael Thursby

Electrical Engineering and Computer Science Faculty Publications

This paper discusses the fundamental issues being investigated by Florida Institute of Technology (F.I.T.) to implement the technology of smart structural systems for DoD, NASA, and commercial applications. Embedded sensors and actuators controlled by processors can provide a modification of the mechanical characteristics of composite structures to produce smart structures1-3. Recent advances in material science have spurred the development and use of composite materials in a wide range of applications from rotocraft blades and advanced tactical fighter aircraft to undersea and aerospace structures. Along with the advantages of an increased strength-to-weight ratio, the use of these materials has raised a …

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Image Preprocessing For Phase- Only Filtering, Samuel Peter Kozaitis, Atikom Roeksabutr Jan 1990

Image Preprocessing For Phase- Only Filtering, Samuel Peter Kozaitis, Atikom Roeksabutr

Electrical Engineering and Computer Science Faculty Publications

We compare the performance of an optical binary phase-only correlator using several nonlinear filters for preprocessing. An image of an airfield with different but similar appearing planes is used as the input data. The performance of the correlator was measured by examining several parameters in the correlation plane. Performance criteria are the signal-to-clutter ratio, the signal-to-noise ratio for objects within the same class, and the variance of the correlation peak within a class. Input images to the correlator were preprocessed using nonlinear filters based on both median filtering and adaptive filtering. The preprocessing improved the performance of the correlator by …

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Ground Exploitation Using A Binary Phase-Only Optical Correlator, Samuel Peter Kozaitis, Sandra L. Halby, Wesley E. Foor Jan 1990

Ground Exploitation Using A Binary Phase-Only Optical Correlator, Samuel Peter Kozaitis, Sandra L. Halby, Wesley E. Foor

Electrical Engineering and Computer Science Faculty Publications

Experimental results of an optical binary phase-only correlator using aerial imagery for ground exploitation is presented. The correlator uses magnetooptic spatial light modulators (SLMs) for dynamic operation. Input images to the correlator originate from actual aerial imagery containing aircraft and a variety of distortions. Digital image processing techniques are used on images before being input into the optical correlator to enhance the performance of the system. Filters or templates used as a database for the system are derived from models of aircraft. Rotation and scale invariance is achieved through an adaptive filtering technique in which filters are displayed sequentially against …

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Digital Optical Iterative Pattern Recognizer, Samuel Peter Kozaitis, C. S. Kischuk May 1988

Digital Optical Iterative Pattern Recognizer, Samuel Peter Kozaitis, C. S. Kischuk

Electrical Engineering and Computer Science Faculty Publications

An optical pattern recognizer which classifies an input sequence into one of two classes is described. The language of regular expressions is used to identify a set of input sequences to be recognized. The system is realized without memory elements by using an optical iterative array it with the method of symbolic substitution. The hardware must be able to implement arbitrary and multiple substitution rules for the general design of a pattern recognizer. © 1988 SPIE

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Focused Acoustic Wave (Faw) Channelizer, Dennis R. Pape, Andrew M. Bardos, Marc H. Popek, Manhar L. Shah Sep 1986

Focused Acoustic Wave (Faw) Channelizer, Dennis R. Pape, Andrew M. Bardos, Marc H. Popek, Manhar L. Shah

Electrical Engineering and Computer Science Faculty Publications

The architecture, operation, and performance of a new integrated acoustic RF channelizer are described. The all- acoustic device uses a phased array piezoelectric transducer to generate frequency dispersed bulk acoustic waves over a 500 MHz bandwidth. The waves are focused onto a 25 channel receiver electrode array by a cylindrical reflector formed on the opposing surface of the device. This channelizer has the potential of providing higher dynamic range than competing technologies. © 1986 SPIE.

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Analysis Of A Microcircuit, Distributed Parameter Network, Which Considers Series Inductance And Shunt Conductance, Arun Jayantilal Shah Jan 1973

Analysis Of A Microcircuit, Distributed Parameter Network, Which Considers Series Inductance And Shunt Conductance, Arun Jayantilal Shah

Theses and Dissertations

In this work analysis of distributed microcircuit is carried out including effects of series inductance and shunt conductance. General solution for voltage and current are obtained in terms of arbitrary constants which are to be determined by input and output conditions. Terminal voltages and terminal currents are expressed by Indefinite Admittance Matrix and port voltage, and port currents are expressed by Indefinite Impedance Matrix. Illustrative example is solved using indefinite matrix configuration and proper boundary conditions.

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