Download or read book Frequency Selective Surfaces as Near Infrared Electro Magnetic Filters for Thermophotovoltaic Spectral Control written by David M. DePoy and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency selective surfaces (FSS) effectively filter electromagnetic radiation in the microwave band (1mm to 100mm). Interest exists in extending this technology to the near infrared (1 {micro}m to 10 {micro}m) for use as a filter of thermal radiation in thermophotovoltaic (TPV) direct energy conversion. This paper assesses the ability of FSS to meet the strict spectral performance requirements of a TPV system. Inherent parasitic absorption, which is the result of the induced currents in the FSS metallization, is identified as a significant obstacle to achieving high spectral performance.

Download or read book Frequency Selective Surfaces as Near Infrared Electro Magnetic Filters for Thermophotovoltaic Spectral Control written by DM DePoy and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency selective surfaces (FSS) effectively filter electromagnetic radiation in the microwave band (1 mm to 100 mm). Interest exists in extending this technology to the near infrared (1 {micro}m to 10 {micro}m) for use as a filter of thermal radiation in thermophotovoltaic (TPV) direct energy conversion. This paper assesses the ability of FSS to meet the strict spectral performance requirements of a TPV system. Inherent parasitic absorption, which is the result of the induced currents in the FSS metallization, is identified as a significant obstacle to achieving high spectral performance.

Download or read book Frequency Selective Surfaces as Near Infrared Electro Magnetic Filters for Thermophotovoltaic Spectral Control written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency selective surfaces (FSS) effectively filter electromagnetic radiation in the microwave band (1mm to 100mm). Interest exists in extending this technology to the near infrared (1[micro]m to 10[micro]m) for use as a filter of thermal radiation in thermophotovoltaic (TPV) direct energy conversion. This paper assesses the ability of FSS to meet the strict spectral performance requirements of a TPV system. Inherent parasitic absorption, which is the result of the induced currents in the FSS metallization, is identified as a significant obstacle to achieving high spectral performance.

Download or read book Thermophotovoltaics written by Thomas Bauer and published by Springer Science & Business Media. This book was released on 2011-06-17 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermophotovoltaics is the science and technology associated with the direct generation of electricity from high temperature heat. Potential applications include combined heat and power, portable and auxiliary power, radioisotope space power, industrial waste heat recovery and concentrated solar power. This book aims at serving as an introduction to the underlying theory, overview of present day components and system arrangements, and update of the latest developments in the field. The emphasis is placed on the understanding of the critical aspects of efficient thermophotovoltaic system design. The aim is to assist researchers in the field.

Download or read book Thermophotovoltaic Generation of Electricity written by Carlos Algora and published by American Institute of Physics. This book was released on 2007-03-09 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features peer-reviewed papers that were presented at the Seventh World Conference on Thermophotovoltaic Generation of Electricity. Thermophotovoltaic technology is a promising new means for the direct conversion of thermal to electric energy. Its potential applications range from military power, to space propulsion, to commercial products for market niches.

Download or read book Thermophotovoltaic Generation of Electricity written by Ashok Gopinath and published by American Institute of Physics. This book was released on 2004-12-07 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermophotovoltaic (TPV) technology is a promising new means for the direct conversion of thermal to electric energy. This conference volume presents a broad range of peer-reviewed papers on various potential and current applications.

Download or read book Aerospace America written by and published by . This book was released on 2004 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frequency Selective Surfaces written by Ben A. Munk and published by John Wiley & Sons. This book was released on 2005-03-11 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: "...Ben has been the world-wide guru of this technology, providing support to applications of all types. His genius lies in handling the extremely complex mathematics, while at the same time seeing the practical matters involved in applying the results. As this book clearly shows, Ben is able to relate to novices interested in using frequency selective surfaces and to explain technical details in an understandable way, liberally spiced with his special brand of humor... Ben Munk has written a book that represents the epitome of practical understanding of Frequency Selective Surfaces. He deserves all honors that might befall him for this achievement." -William F. Bahret. Mr. W. Bahret was with the United States Air Force but is now retired. From the early 50s he sponsored numerous projects concerning Radar Cross Section of airborne platforms in particular antennas and absorbers. Under his leadership grew many of the concepts used extensively today, as for example the metallic radome. In fact, he is by many considered to be the father of stealth technology. "This book compiles under one cover most of Munk's research over the past three decades. It is woven with the physical insight that he has gained and further developed as his career has grown. Ben uses mathematics to whatever extent is needed, and only as needed. This material is written so that it should be useful to engineers with a background in electromagnetics. I strongly recommend this book to any engineer with any interest in phased arrays and/or frequency selective surfaces. The physical insight that may be gained from this book will enhance their ability to treat additional array problems of their own." -Leon Peters, Jr. Professor Leon Peters, Jr., was a professor at the Ohio State University but is now retired. From the early sixties he worked on, among many other things, RCS problems involving antennas and absorbers. This book presents the complete derivation of the Periodic Method of Moments, which enables the reader to calculate quickly and efficiently the transmission and reflection properties of multi-layered Frequency Selective Surfaces comprised of either wire and/or slot elements of arbitrary shape and located in a stratified medium. However, it also gives the reader the tools to analyze multi-layered FSS's leading to specific designs of the very important Hybrid Radome, which is characterized by constant band width with angle of incidence and polarization. Further, it investigates in great detail bandstop filters with large as well as narrow bandwidth (dichroic surfaces). It also discusses for the first time, lossy elements used in producing Circuit Analog absorbers. Finally, the last chapter deals with power breakdown of FSS's when exposed to pulsed signals with high peak power. The approach followed by most other presentations simply consists of expanding the fields around the FSS, matching the boundary conditions and writing a computer program. While this enables the user to obtain calculated results, it gives very little physical insight and no help in how to design actual multi-layered FSS's. In contrast, the approach used in this title analyzes all curves of desired shapes. In particular, it discusses in great detail how to produce radomes made of FSS's located in a stratified medium (Hybrid Radomes), with constant band width for all angles of incidence and polarizations. Numerous examples are given of great practical interest. More specifically, Chapter 7 deals with the theory and design of bandpass radomes with constant bandwidth and flat tops. Examples are given for mono-, bi- and tri-planar designs. Chapter 8 deals with bandstop filters with broad as well as narrow bandwidth. Chapter 9 deals with multi-layered FSS of lossy elements, namely the so-called Circuit Analog Absorbers, designed to yield outstanding absorption with more than a decade of bandwidth. Features material previously labeled as classified by the United States Air Force.

Download or read book Frequency Selective Surface Based Bandpass Filters in the Near infrared Region written by Srikanth Govindaswamy and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Science in China written by and published by . This book was released on 2008 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Infrared Filters and Metamaterials Based on Frequency Selective Surfaces written by Jeremy Alec Bossard and published by . This book was released on 2009 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tandem Filters Using Frequency Selective Surfaces for Enhanced Conversion Efficiency in a Thermophotovoltaic Energy Conversion System written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This invention relates to the field of thermophotovoltaic (TPV) direct energy conversion. In particular, TPV systems use filters to minimize parasitic absorption of below bandgap energy. This invention constitutes a novel combination of front surface filters to increase TPV conversion efficiency by reflecting useless below bandgap energy while transmitting a very high percentage of the useful above bandgap energy. In particular, a frequency selective surface is used in combination with an interference filter. The frequency selective surface provides high transmission of above bandgap energy and high reflection of long wavelength below bandgap energy. The interference filter maintains high transmission of above bandgap energy and provides high reflection of short wavelength below bandgap energy and a sharp transition from high transmission to high reflection.

Download or read book Final Report for Frequency Selective Surfaces for Rugged Thermophotovoltaic Emitters written by and published by . This book was released on 2001 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ion Optics created an array of regularly spaced holes in a thin conductive surface film on a dielectric substrate. When heated, this pattern behaved as a selective emitter, with more than 50% of total radiation in a well-defined peak with a center frequency determined by geometrical spacing. Peak wavelength did not alter with change in temperature, and materials easily survived 10 hours at 1000 C in air. The selective emitter will increase efficiency of thermophotovoltaic power converters.

Download or read book Multiband Infrared Frequency Selective Surfaces written by and published by . This book was released on 2003 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes the design and fabrication of multiband infrared frequency selective surfaces (FSSs) that consist of selfsimilar fractal cross dipole metallic elements patterned on flexible dielectric substrates. Two transmission stopbands centered at 6.4 THz (15.3 dB) and 17.5 THz ( -6.2 dB) were measured on FSSs with primary and secondary cross elements that are 17 m and 7 m long and 1 m wide. These properties correspond well to those predicted by a periodic method of moments model that was used to formulate electromagnetic scattering from this FSS. Future work will include modulating passband frequencies through field-controlled modulations of the physical properties of the substrate.

Download or read book Fundamentals of Thermophotovoltaic Energy Conversion written by Donald Chubb and published by Elsevier. This book was released on 2007-05-11 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a text book presenting the fundamentals of thermophotovoltaic(TPV) energy conversion suitable for an upper undergraduate or first year graduate course. In addition it can serve as a reference or design aid for engineers developing TPV systems. Each chapter includes a summary and concludes with a set of problems. The first chapter presents the electromagnetic theory and radiation transfer theory necessary to calculate the optical properties of the components in a TPV optical cavity. Using a simplified model, Chapter 2 develops expressions for the maximum efficiency and power density for an ideal TPV system. The next three chapters consider the three major components in a TPV system; the emitter, filter and photovoltaic(PV) array. Chapter 3 applies the electromagnetic theory and radiation transfer theory presented in Chapter 1 in the calculation of spectral emittance. From the spectral emittance the emitter efficiency is calculated. Chapter 4 discusses interference, plasma and resonant array filters plus an interference filter with an imbedded metallic layer, a combined interference-plasma filter and spectral control using a back surface reflector(BSR) on the PV array. The theory necessary to calculate the optical properties of these filters is presented. Chapter 5 presents the fundamentals of semiconductor PV cells. Using transport equations calculation of the current-voltage relation for a PV cell is carried out. Quantum efficiency, spectral response and the electrical equivalent circuit for a PV cell are introduced so that the PV cell efficiency and power output can be calculated. The final three chapters of the book consider the combination of the emitter, filter and PV array that make up the optical cavity of a TPV system. Chapter 6 applies radiation transfer theory to calculate the cavity efficiency of planar and cylindrical optical cavities. Also introduced in Chapter 6 are the overall TPV efficiency, thermal efficiency and PV efficiency. Leakage of radiation out of the optical cavity results in a significant loss in TPV efficiency. Chapter 7 considers that topic. The final chapter presents a model for a planar TPV system. Six appendices present background information necessary to carry out theoretical developments in the text. Two of the appendices include Mathematica programs for the spectral optical properties of multi-layer interference filters and a planar TPV system. Software is included for downloading all the programs within the book. First text written on thermophotovoltaic(TPV) energy conversion Includes all the necessary theory to calculate TPV system performance Author has been doing TPV energy conversion research since 1980's Emphasizes the fundamentals of TPV energy conversion Includes a summary and problem set at the end of each chapter Includes Mathematica programs for calculating optical properties of interference filters and planar TPV system performance solution software

Download or read book The Laws of Radiation and Absorption Memoirs by Prevost Stewart Kirchhoff and Kirchhoff and Bunsen written by D. B. Brace and published by Lucas Press. This book was released on 2008-08 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE LAWS OF RADIATION AND ABSORPTION - MEMOIRS BY PREVOST, STEWART, KIRCHHOFF, AND KERCHROFF AND BUNSEN - By D. B. Brace - 1901

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt: