Fundamentals Of An Atomic Force Microscope Based On A Digital Versatile Disk Optical Pick Up Unit
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Fundamentals of an Atomic Force Microscope Based on a Digital Versatile Disk Optical Pick-up Unit
A novel non-contact multiaxial astigmatic detection system (ADS) is designed and developed using the astigmatism as the measuring principle for the translational displacement, the angle, and their variations of a measured surface simultaneously. An optical pickup unit (OPU) of a commercial digital versatile disk (DVD) read only memory (ROM) drive can be used directly as an optical path mechanism in the above mentioned ADS, which can measure the translational and angular displacements accurately and simultaneously. The total linear detection range and the maximum measurement bandwidth of the ADS are 6 mm and 80MHz, respectively. The resolution of the translational displacement measurement is in sub-angstrom scale. For an operating frequency of 700 kHz, the noise floors of the translational and angular signals are below 0.8 pm/Hz1/2 and 0.4 mrad/ Hz1/2, respectively. The ADS can monitor the translational and two orthogonal angular displacements of a micro fabricated cantilever in atomic force microscopy (AFM). All the three, contact non-contact and tapping, modes can resolve the single atomic steps of the graphite surface, which indicates that atomic resolution is achievable with the ADS. The thermal noise spectra of the AFM probe can be clearly measured as well. Furthermore, the accuracy of scanning probe microscopy (SPM) depends not only on the measurement system itself, but also by the accuracy of the signal processing, which further depends on the physical and geometrical characteristics of the probe. The structure of the ADS is compact and stable. Besides the measurements through AFM probes, the ADS can be operated in profilometer mode. The CD surface and the CCD microlens are measured by this mode. The maximum scanning speed can reach up to 3.84×106 mm/s theoretically, almost one million times faster than that of a commercial SPM system. The ADS has a great potential for future development, the expansibility and the accuracy can evolve with the performance of future OPU. From the DVD OPU to higher resolution one, such as the OPU of the Blu-ray drive or high- definition (HD-DVD), can be integrated into the ADS as well. KEYWORDS: Astigmatism, ADS, Translational displacement, Angular displacement, SPM, AFM, Cantilever, Optical profilometer
Feedback Systems
Author: Karl Johan Åström
language: en
Publisher: Princeton University Press
Release Date: 2021-02-02
The essential introduction to the principles and applications of feedback systems—now fully revised and expanded This textbook covers the mathematics needed to model, analyze, and design feedback systems. Now more user-friendly than ever, this revised and expanded edition of Feedback Systems is a one-volume resource for students and researchers in mathematics and engineering. It has applications across a range of disciplines that utilize feedback in physical, biological, information, and economic systems. Karl Åström and Richard Murray use techniques from physics, computer science, and operations research to introduce control-oriented modeling. They begin with state space tools for analysis and design, including stability of solutions, Lyapunov functions, reachability, state feedback observability, and estimators. The matrix exponential plays a central role in the analysis of linear control systems, allowing a concise development of many of the key concepts for this class of models. Åström and Murray then develop and explain tools in the frequency domain, including transfer functions, Nyquist analysis, PID control, frequency domain design, and robustness. Features a new chapter on design principles and tools, illustrating the types of problems that can be solved using feedback Includes a new chapter on fundamental limits and new material on the Routh-Hurwitz criterion and root locus plots Provides exercises at the end of every chapter Comes with an electronic solutions manual An ideal textbook for undergraduate and graduate students Indispensable for researchers seeking a self-contained resource on control theory
Handbook of Modern Sensors
Author: Jacob Fraden
language: en
Publisher: Springer Science & Business Media
Release Date: 2004
This book is about devices commonly called sensors. Digital systems, however complex and intelligent they might be, must receive information from the outside world that is generally analog and not electrical. Sensors are interface devices between various physical values and the electronic circuits who "understand" only a language of moving electrical charges. In other words, sensors are the eyes, ears, and noses of silicon chips. Unlike other books on sensors, this book is organized according to the measured variables (temperature, pressure, position, etc.) that make it much more practical and easier to read. In this new edition recent ideas and developments have been added while less important and non-essential designs were dropped. Sections on practical designs and use of the modern micro-machining technologies have been revised substantially. This book is a reference text that can be used by students, researchers interested in modern instrumentation (applied physicists and engineers), sensor designers, application engineers and technicians whose job it is to understand, select and/or design sensors for practical systems. The scope of this book is rather broad covering many different designs. Some are well known, but describing them is still useful for students and those who look for a convenient reference. It is the author's intention to present a comprehensive and up-to-date account of the theory (physical principles), design, and practical implementations of various sensors for scientific, industrial, and consumer applications.nbsp;nbsp;From the reviews:"... A very useful book ... It strikes an excellent balance between a large variety of different sensor types and moderate description of each to yield a book of reasonable length ... Provides excellent information on all types of physical measurements. I recommend it highly." Biomedical Instrumentation & Technology"Jacob Fraden has produced a valuable, single-volume reference on the devices that bridge the analog and digital worlds." Lawrence Rubin, MIT From the reviews of the third edition:"This is a weighty volume of nearly 600 pages. ... The book is undoubtedly useful as a source of reference. The large number of sensors described in it, and the consideration of underlying principles of operation should help people ... ." (Allan Hobson, Robotica, Vol. 23, 2005)"This book handles the basic and absolutely most important common areas of all sensor applications. It gives a good overview of a very wide range of sensor applications, which is not found in many other books in such a detailed form. ... This book is useful for everybody who works with any kind of measurement technique. For beginners it is a good introduction to the world of sensors. For advanced users it is a good and extensive handbook and help." (Rüdiger Frank, Analytical and Bioanalytical Chemistry, Vol. 382, 2005)"This book ... aims for breadth and to be a reasonably comprehensive account of most modern sensors. ... The Handbook is a readable reference text for researchers, graduate students and engineers ... . Don't read this book if you don't want to know how the sensors work ... . If, however you want to understand how a sensor works, the principle behind it ... or use all that sensors have to offer technically, then this book is for you." (Stephen Kukureka Fimmm, Materials World, Vol. 13 (2), February, 2005)