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Author: J. R. Forrest Publisher: ISBN: Category : Languages : en Pages : 42
Book Description
The report describes techniques for the continuous monitoring and control of phase and output power in active phased array modules. The output phase and power of the signal from the module are sensed by a simple six-port network using Schottky barrier detectors; the output voltage from these detectors is used in a control loop to provide correction signals to a phase shifter and attenuator. Two control schemes have been compared. One is a digital loop using a microprocessor and this achieves an overall control accuracy of 0.1dB and 1 deg, but has the disadvantage of complexity and of a response time in the order of hundreds of milliseconds. The second is completely analogue loop which has a response time of less than 100ns and can provide real-time phase correction during the output pulse from a module. Although the control accuracy is marginally worse with the analogue loop in these initial tests, it is expected that refinements in the continuation of this work will enable the same accuracy to be achieved in both digital and analogue loop techniques. The application of these techniques may be particularly important in future monolithic integrated circuit radar module design. (Author).
Author: J. R. Forrest Publisher: ISBN: Category : Languages : en Pages : 42
Book Description
The report describes techniques for the continuous monitoring and control of phase and output power in active phased array modules. The output phase and power of the signal from the module are sensed by a simple six-port network using Schottky barrier detectors; the output voltage from these detectors is used in a control loop to provide correction signals to a phase shifter and attenuator. Two control schemes have been compared. One is a digital loop using a microprocessor and this achieves an overall control accuracy of 0.1dB and 1 deg, but has the disadvantage of complexity and of a response time in the order of hundreds of milliseconds. The second is completely analogue loop which has a response time of less than 100ns and can provide real-time phase correction during the output pulse from a module. Although the control accuracy is marginally worse with the analogue loop in these initial tests, it is expected that refinements in the continuation of this work will enable the same accuracy to be achieved in both digital and analogue loop techniques. The application of these techniques may be particularly important in future monolithic integrated circuit radar module design. (Author).
Author: Daniel Malacara Publisher: John Wiley & Sons ISBN: 0471484040 Category : Science Languages : en Pages : 882
Book Description
The purpose of this third edition is to bring together in a single book descriptions of all tests carried out in the optical shop that are applicable to optical components and systems. This book is intended for the specialist as well as the non-specialist engaged in optical shop testing. There is currently a great deal of research being done in optical engineering. Making this new edition very timely.
Author: Kuan Chee Publisher: ISBN: 1789856213 Category : Applied optics. Photonics Languages : en Pages : 180
Book Description
This book provides a wide-ranging overview of the current state-of-the-art and new trends in photodetector design and research. Written by a team of internationally renowned experts, with contributions from universities, research institutes and industries, this work is suitable for students and professionals interested in studying and dealing with photodetector design and technology, as well as the wide gamut of related applications. Its coverage includes: physics and fundamentals of photodetectors; physical models of photodetector operation; new materials, design, processing and function of photodetectors in related applications; testing, monitoring and calibration; and research progress in photodetector-related areas. Theoretical aspects, design and simulation principles, and important experimental results are thoroughly addressed, embodying a comprehensive account of current activity in this important field of research and industry.
Author: Manuel Servin Publisher: John Wiley & Sons ISBN: 3527411526 Category : Technology & Engineering Languages : en Pages : 344
Book Description
The main objective of this book is to present the basic theoretical principles and practical applications for the classical interferometric techniques and the most advanced methods in the field of modern fringe pattern analysis applied to optical metrology. A major novelty of this work is the presentation of a unified theoretical framework based on the Fourier description of phase shifting interferometry using the Frequency Transfer Function (FTF) along with the theory of Stochastic Process for the straightforward analysis and synthesis of phase shifting algorithms with desired properties such as spectral response, detuning and signal-to-noise robustness, harmonic rejection, etc.
Author: Jia'en Lin Publisher: Springer Nature ISBN: 9811921490 Category : Science Languages : en Pages : 5829
Book Description
This book focuses on reservoir surveillance and management, reservoir evaluation and dynamic description, reservoir production stimulation and EOR, ultra-tight reservoir, unconventional oil and gas resources technology, oil and gas well production testing, and geomechanics. This book is a compilation of selected papers from the 11th International Field Exploration and Development Conference (IFEDC 2021). The conference not only provides a platform to exchanges experience, but also promotes the development of scientific research in oil & gas exploration and production. The main audience for the work includes reservoir engineer, geological engineer, enterprise managers, senior engineers as well as professional students.
Author: Timothy D.W. Claridge Publisher: Newnes ISBN: 0080546285 Category : Mathematics Languages : en Pages : 400
Book Description
"Nuclear Magnetic Resonance (NMR) Spectroscopy remains the foremost analytical technique for the structure elucidation of organic molecules and an indispensable tool for the synthetic, medicinal and natural product chemist. New techniques continue to emerge and the application of NMR methods continues to expand. High-Resolution NMR Techniques in Organic Chemistry is designed for use in academic and industrial NMR facilities, as a text for graduate-level NMR courses, and as an accessible reference for the chemist's or spectroscopist's desk."--BOOK JACKET.
Author: Chun-yi Su Publisher: World Scientific ISBN: 9814474908 Category : Technology & Engineering Languages : en Pages : 421
Book Description
This second volume is a compilation of 43 articles representing the scientific and technical advances in various aspects of system dynamics, instrumentation, measurement techniques, simulation and controls, which would serve as an important resource in the field. The articles represent state-of-the-art contributions in the fields of dynamics and control of nonlinear, hybrid and stochastic systems; nonlinear control theory; and adaptive, model predictive and real-time controls with applications involving fault diagnostics, manufacturing systems, vehicular dynamics, simulator designs, smart actuators, etc.
Author: Edgar Völkl Publisher: Springer Science & Business Media ISBN: 1461548179 Category : Technology & Engineering Languages : en Pages : 362
Book Description
Experienced and novice holographers receive a solid foundation in the theory and practice of holography, the next generation of imaging technology, in this superb text. The book's `how to' aspects enable readers to learn hologram acquisition at the microscope and processing of holograms at the computer as well as digital imaging techniques. A complete bibliography on electron holography and applications of the method to problems in materials science, physics and the life sciences round out the volume's coverage.
Author: J. R. Forrest
Author: J. R. Forrest
Author: 
Author: Daniel Malacara
Author: Kuan Chee
Author: M. V. Suryaprakash
Author: Manuel Servin
Author: Jia'en Lin
Author: Timothy D.W. Claridge
Author: Chun-yi Su
Author: Edgar Völkl