Titre : | Electro-optical imaging system performance |
Auteurs : | Gerald c. Holst |
Type de document : | Books |
Mention d'édition : | 6th ed. |
Editeur : | Winter Park, FL : JCD Publishing, 2017 |
Article en page(s) : | XVIII, 389 p. |
ISBN/ISSN/EAN : | 978-1-5106-1102-3 |
Langues: | Anglais |
Index. décimale : | 621.381045 |
Tags : | Optoelectronic devices ; Infrared imaging ; Infrared detectors ; Quantum wells ; Electrooptical devices ; Electrooptics--Mathematics ; Imaging systems |
Résumé : |
Preface to the Sixth Edition Microsoft Word was my real frustration in producing this edition. The prior (5th) edition was written with Office 2003. Office 2003 equations are not compatible with Office 2013 — so each equation (all 442 of them) had to be retyped. The aggravation does not end there. No keyboard character can be on the same line as the equation. So, the equations are placed in a 2×1 table with the equation in the center cell and the equation number in the righthand cell. Now comes the editing. Text, tables, references, and figures have been rearranged for efficient layout. Since this text is about systems, it is sometimes difficult to decide in which chapter a specific topic belongs, since everything is intertwined. For example, integration time affects linear motion (Chapter 6), the number of photoelectrons (Chapter 11), and the system noise (Chapter 12). As the book evolved the chapter sequence changed numerous times, ending up with six sections: 1) The basics, 2) Imaging system chain analysis: MTF approach, 3) Signal to noise ratio, 4) Targets and backgrounds, 5) Image quality metrics, and 6) Acquisition range. Words are important: can and will have very different meanings. Likewise, suggests means the statement might be true whereas is means the truth. This book focuses on staring arrays. Readers can find scanning array equations in the (out-of-print) 5th edition. Up-to-date references (latest published September 2016) have been added. A few recent ones are somewhat dubious. Time will tell if these papers are fact or fiction. But, that is the nature of research. What appears to be a good idea today is trashed by future research. You can go to my earlier editions and easily say, "That is not true!" Missing is the operative word today: That is not true TODAY. The first edition appeared in 1995 and has been updated over the years, with over 5,700 copies sold. Hard to believe that 5,700 folks are interested in this niche area. So, I say to my friends: "During an archeological dig one thousand years from now, this book appears and the scientists will exclaim 'What was he thinking?'" Which is, exactly, the topic of this book. OK — What is new in the sixth edition? The U.S. Army models have evolved over the years to keep abreast with hardware technology changes, laboratory data, and field performance. There are four primary U.S. models: 1) NVThermIP predicts the performance of systems operating in the MWIR and LWIR thermal bands; 2) IINVD is used for image intensifier direct-view goggles; 3) SSCamIP models reflective band cameras; and 4) IICam addresses indirect view I2 sensors where a tube is coupled with a detector array. The four models have been combined into NVIPM (Night vision integrated performance model), which was released in May 2013. Targets in the visible, NIR, SWIR, MWIR, and LWIR spectral bands have different spectral components and nomenclature. Thus, NVIPM contains a module for each spectral band. The detected signal and subsequently displayed image do not contain any sensor spectral information and the post-detector signal is common to all imaging systems. Since NVIPM includes visible and SWIR systems, a few sections for CCD, CMOS, and SWIR sensors have been added. Prior to NVIPM, each variable change required re-running the model. NVIPM provides an extensive trade study capability that allows users to compare system performance by varying any combination of input, output, and component values. With NVIPM, the variables are run in batch mode and the output (e.g., range) is plotted as a function of any input variable. Also included is a gradient feature that indicates which input variables affect the output, in descending order. The gradient feature is extremely useful for subsystem tolerancing. Probably the most valuable chapter is Chapter 21, Trade studies. The various variables can be considered as slices through a multi-dimensional space. Since it is not possible to illustrate more than three dimensions at a time, each tradeoff analysis represents only one plane through this space. Each provides a different view of overall optimization. For example, if a system is detector-limited, modifying the optics will have minimal effect on acquisition range. If turbulence limited or motion limited, no system change will appreciably affect performance. Because the U.S. models have continually changed, the Europeans are developing the European computer model for optronic system performance prediction (ECOMOS) based on the German thermal range model (TRM) and the Dutch triangle orientation discrimination (TOD). Each model (NVIPM, TRM, TOD) provides a different target acquisition range. At this juncture, it is unknown which is "correct" although the respective authors think they know. It is hard work writing a technical book; taking somewhere between 6 months and a year glued to a computer. My wife had said many times, "I want you back." Marilyn, I am back! Orges Furxhi, St. Johns Optical, and Chris Dobbins, AMRDEC, provided valuable technical reviews. Doug Marks, itinerant editor, provided many of the drawings and final editing. I appreciated Doug's "instant" response to my requests for drawing modifications. Gerald C. Holst March 2017 |
En ligne : | https://trove.nla.gov.au/version/249674210 |
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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307576 | 621.381045 HOL E | Book | Royal Military Academy | Communication, Information, Systems & Sensors | Disponible |