Self Interferometry

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Self-mixing Interferometry for Absolute Distance Measurement

Author : Mengkoung Veng (docteur en photonique).)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Self-mixing Interferometry for Absolute Distance Measurement by : Mengkoung Veng (docteur en photonique).)

Download or read book Self-mixing Interferometry for Absolute Distance Measurement written by Mengkoung Veng (docteur en photonique).) and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-mixing Interferometry has been studied extensively in the last five decades in various sensing applications. Sensors under the SMI technique have the laser diode as the light source, the interferometer, and the detector. The light from the laser diode propagates towards a distant target where it is partially reflected or back-scattered before being re-injected into the active cavity of the laser. When the laser diode experiences the external optical feedback, the reflected light imprinted with information from the distant target or from the external cavity medium induces perturbation to the operating parameters of the laser. For SMI measurement sensors such as harmonic motion and absolute distance applications, the fringe counting method is basically used to determine the target's displacement and distance respectively. Two different approaches to modelling the SMI phenomenon have been developed: the three-mirror cavity and the perturbation of the rate equation. The single equation that describes the phase condition imposed by the optical feedback is usually referred to as the excess phase equation. One of the most important and most useful parameters in the excess phase equation is the feedback parameter C as it can be used to qualitatively categorize the regime of the laser under optical feedback. When the feedback level C 1, the laser behaviour is stable. On the other hand, when the feedback level C 1, more complex phenomena are observed such as hysteresis effect, presence of multiple emission frequencies (including the unstable frequencies), apparent splitting of the emission line due to mode hopping and fringe disappearance phenomenon. The fringes disappearance phenomenon in the self-mixing interferometry occurs whenever the external round-trip phase at free-running state is modulated by either external modulation such as external cavity length changes or internal modulation when the laser injection current is modulated with a high back-scattered light power. This phenomenon has been observed by many authors for harmonic motion or vibration application and more recently in the case of the absolute distance measurement scheme when the laser injection current is modulated in the triangle waveform. This phenomenon is highly dependent on the feedback parameter C and it is described in detail based on the coupled cavity model. The primary cause for fringes disappearance is demonstrated to be the expansion of the excess phase equation stable solutions range with the increment of the parameter C, thus reducing the number of stable solutions for a given phase stimulus. This new approach in the modelling of the fringe disappearance phenomenon allows determination of the C values for which a pair of fringes are expected to disappear and as a consequence correlates the number of missing fringes to the value of C. This approach is validated both by a behavioural model of the laser under optical feedback and by a series of measurements in the SMI absolute distance configuration.

Neutron Interferometry

Author : Helmut Rauch
Publisher :
ISBN 13 : 0198712510
Total Pages : 460 pages
Book Rating : 4.1/5 (987 download)

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Book Synopsis Neutron Interferometry by : Helmut Rauch

Download or read book Neutron Interferometry written by Helmut Rauch and published by . This book was released on 2015 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quantum interference of de Broglie matter waves is probably one of the most startling and fundamental aspects of quantum mechanics. It continues to tax our imaginations and leads us to new experimental windows on nature. Quantum interference phenomena are vividly displayed in the wideassembly of neutron interferometry experiments, which have been carried out since the first demonstration of a perfect silicon crystal interferometer in 1974. Since the neutron experiences all four fundamental forces of nature (strong, weak, electromagnetic, and gravitational), interferometry withneutrons provides a fertile testing ground for theory and precision measurements. Many Gedanken experiments of quantum mechanics have become real due to neutron interferometry.Quantum mechanics is a part of physics where experiment and theory are inseparably intertwined. This general theme permeates the second edition of this book. It discusses more than 40 neutron interferometry experiments along with their theoretical motivations and explanations. The basic ideas andresults of interference experiments related to coherence and decoherence of matter waves and certain post-selection variations, gravitationally induced quantum phase shifts, Berry`s geometrical phases, spinor symmetry and spin superposition, and Bell's inequalities are all discussed and explained inthis book. Both the scalar and vector Aharonov-Bohm topological interference effects and the neutron version of the Sagnac effect are presented in a self-contained and pedagogical way. Interferometry with perfect crystals, artificial lattices, and spin-echo systems are also topics of this book. Itincludes the theoretical underpinning as well as connections to other areas of experimental physics, such as quantum optics, nuclear physics, gravitation, and atom interferometry. The observed phase shifts due to the Earth's gravity and rotation indicate a close connection to relativity theory.Neutron interferometry can be considered as a central technique of quantum optics with massive particles. It has stimulated the development of interferometry with atoms, molecules and clusters.The book is written in a style that will be suitable at the senior undergraduate and beginning of graduate level. It will interest and excite many students and researchers in neutron, nuclear, quantum, gravitational, optical, and atomic physics. Lecturers teaching courses in modern physics andquantum mechanics will find a number of interesting and historic experiments they may want to include in their lectures.

Interferometry

Author : Ivan Padron
Publisher : BoD – Books on Demand
ISBN 13 : 9535104039
Total Pages : 478 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Interferometry by : Ivan Padron

Download or read book Interferometry written by Ivan Padron and published by BoD – Books on Demand. This book was released on 2012-03-21 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the most recent studies on interferometry and its applications in science and technology. It is an outline of theoretical and experimental aspects of interferometry and their applications. The book is divided in two sections. The first one is an overview of different interferometry techniques and their general applications, while the second section is devoted to more specific interferometry applications comprising from interferometry for magnetic fusion plasmas to interferometry in wireless networks. The book is an excellent reference of current interferometry applications in science and technology. It offers the opportunity to increase our knowledge about interferometry and encourage researchers in development of new applications.

Very Long Baseline Interferometry

Author : Marcello Felli
Publisher : Springer Science & Business Media
ISBN 13 : 9400924283
Total Pages : 436 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Very Long Baseline Interferometry by : Marcello Felli

Download or read book Very Long Baseline Interferometry written by Marcello Felli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quest for high resolution has preoccupied radio astronomers ever since radio waves were first detected from space fifty years ago. This venture was par ticularly stimulated by the discovery of quasars, and led to the development of interferometer techniques using baselines of transglobal dimensions. These meth ods have become known as Very Long Baseline Interferometry (VLBI). Arrays of radio telescopes situated all over the Earth (or even in space) are regularly used for researches in radio astronomy, reaching resolutions as small as a fraction of a milli arcsecond. The technique also allows the measurement of the positions of the radio telescopes to a few millimeters and so VLBI has become a major tool in geodesy and the study of the rotation of the Earth. VLBI has now passed the pioneer stage and is becoming a standard facility available to astronomers and geodesists, requiring the coordination of the operations of indpendently owned radio telescopes around the world. In Europe observatories from England, Federal Republic of Germany, France, Italy, Poland, Sweden and The Netherlands are coordinated in their VLBI activity by the European VLBI Network Consortium (EVN). The Programme Committee of the EVN allocates time to scientific projects on a routine basis three times a year. The Unites States has a similar arrangement of a network of independent radio observatories, and joint experiments using 'Global Network' are often made.

Atom Interferometry

Author : Paul R. Berman
Publisher : Academic Press
ISBN 13 : 008052768X
Total Pages : 497 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Atom Interferometry by : Paul R. Berman

Download or read book Atom Interferometry written by Paul R. Berman and published by Academic Press. This book was released on 1997-01-08 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of atom interferometry has expanded rapidly in recent years, and todays research laboratories are using atom interferometers both as inertial sensors and for precision measurements. Many researchers also use atom interferometry as a means of researching fundamental questions in quantum mechanics. Atom Interferometry contains contributions from theoretical and experimental physicists at the forefront of this rapidly developing field. Editor Paul R. Berman includes an excellent balance of background material and recent experimental results,providing a general overview of atom interferometry and demonstrating the promise that it holds for the future. Includes contributions from many of the research groups that have pioneered this emerging field Discusses and demonstrates new aspects of the wave nature of atoms Explains the many important applications of atom interferometry, from a measurement of the gravitational constant to atom lithography Examines applications of atom interferometry to fundamentally important quantum mechanics problems

Interferometry

Author :
Publisher :
ISBN 13 :
Total Pages : 420 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Interferometry by :

Download or read book Interferometry written by and published by . This book was released on 1995 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Adaptive Self-mixing Interferometry for Metrology Applications

Author : Reza Atashkhooei
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Adaptive Self-mixing Interferometry for Metrology Applications by : Reza Atashkhooei

Download or read book Adaptive Self-mixing Interferometry for Metrology Applications written by Reza Atashkhooei and published by . This book was released on 2014 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the laser based techniques proposed for metrology applications, classical interferometers offer the highest precision measurements. However, the cost of some of the elements involved and the number of optical components used in the setup complicates using them in several industrial applications. Apart from cost, the complexities due to optical alignment and the required quality of the environmental conditions can be quite restrictive for those systems. Within the category of optical interferometers, optical feedback interferometry (OFI), also called self-mixing interferometry (SMI) has the potential to overcome some of the complexities of classical interferometry. It is compact in size, cost effective, robust, self-aligned, and it doesn't require a large number of optical components in the experimental configuration. In OFI, a portion of the emitted laser beam re-enters to the laser cavity after backreflection from the target, causing the wavelength of the laser to change, modifying the power spectrum and consequently the emitted output power, which can be detected for measurement purposes. Thus, the laser operates simultaneously as the light source, the light detector, and as the ultra-sensitive coherent sensor for optical path changes. The present PhD pursued improving the performance of OFI-based sensors using a novel and compact optical system. A solution using an adaptive optical element in the form of a voltage programmable liquid lens was proposed for automated focus adjustments. The amount of backreflected light re-entering the laser cavity could be controlled, and the laser feedback level was adjusted to the best condition in different situations, enabling the power signal to be adjusted to the best possible conditions for measurement. Feedback control enabled the proposal of a novel solution called differential OFI, which improved the measurement resolution down to the nanometre order, even if the displacements were below half-wavelength of the laser, for first time in OFI sensors. Another relevant part of the PhD was devoted to the analysis of speckle-affected optical power signals in feedback interferometers. Speckle effect appears when the displacements of the target are large, and introduces an undesired modulation of the amplitude of the signal. After an analysis of the speckle-affected signal and the main factors contributing to it, two novel solutions were proposed for the control of speckle noise. The adaptive optical head developed previously was used in a real time setup to control the presence of speckle effect, by tracking the signal to noise ratio of the emitted power, and modifying the spot size on the target when required using a feedback loop. Besides, a sensor diversity solution was proposed to enable enhancements in signal detection in fast targets, when real time control could not be applied. Finally, two industrial applications of the technique with the presence of different levels of speckle noise have been presented. A complete measurement methodology for the control of motor shaft runout in permanent magnet electrical motors, enabling complete monitoring of the displacement of the shaft has been developed and implemented in practice. Results here are validated with those obtained using a commercial laser Doppler vibrometer, an equipment with a much higher cost. A second application in the monitoring the displacement of polymer-reinforced beams used in civil engineering under dynamic loading was also demonstrated. Results here are validated using a conventional contact probe (a Linear Vertical Differential Transducer, LVDT). Both applications show that with controlled speckle features OFI performs adequately in industrial environments as a non-contact proximity probe with resolution limited by the constraints defined by the setup.

Self-mixing Interferometry with Vertical-cavity Surface-emitting Lasers

Author : John Tucker
Publisher :
ISBN 13 : 9783838322629
Total Pages : 280 pages
Book Rating : 4.3/5 (226 download)

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Book Synopsis Self-mixing Interferometry with Vertical-cavity Surface-emitting Lasers by : John Tucker

Download or read book Self-mixing Interferometry with Vertical-cavity Surface-emitting Lasers written by John Tucker and published by . This book was released on 2010-02 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Interferometry in Speckle Light

Author : P. Jacquot
Publisher : Springer Science & Business Media
ISBN 13 : 3642573231
Total Pages : 661 pages
Book Rating : 4.6/5 (425 download)

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Book Synopsis Interferometry in Speckle Light by : P. Jacquot

Download or read book Interferometry in Speckle Light written by P. Jacquot and published by Springer Science & Business Media. This book was released on 2012-02-02 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings reflect the work presented at the conference "Interferometry in Speckle Light: Theory and Applications", held at the Ecole Polytechnique Federale de Lausanne, (EPFL), the Swiss Federal Institute of Technology in Lausanne, Switzerland. The event took place from September 25 to September 28, 2000. Thanks to the diligence of the authors, this book has been published just in time for the conference. Writing this preface in July, in anticipation of the conference, we have tried to envisage how this book will benefit the quality of discourse between authors and attendees. "Interferometry in Speckle Light: Theory and Applications" results from a bottom-up approach and is original in several ways. This conference is not part of a series; on the contrary, it is a single event. The idea of gathering scientists and engineers for a general discussion on the theory and the practice of interferometry, involving rough, non-optically polished objects, was "in the air". An opportunity of this sort was not provided by any of the conferences scheduled when the present one was conceived. For this reason, it was easy to convince a small number of renowned researchers, all of them active in the field of holographic and speckle interferometry, to organize a conference. To be specific, they are the people listed below as members of the scientific and local committees. At the same time, a particular circumstance, namely the retirement of Professor L. Pflug, helped to detennine the location of the meeting.

Optical Interferometry, 2e

Author : P. Hariharan
Publisher : Elsevier
ISBN 13 : 0080473644
Total Pages : 368 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Optical Interferometry, 2e by : P. Hariharan

Download or read book Optical Interferometry, 2e written by P. Hariharan and published by Elsevier. This book was released on 2003-10-20 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: When the first edition of Optical Interferometry was published, interferometry was regarded as a rather esoteric method of making measurements, largely confined to the laboratory. Today, however, besides its use in several fields of research, it has applications in fields as diverse as measurement of length and velocity, sensors for rotation, acceleration, vibration and electrical and magnetic fields, as well as in microscopy and nanotechnology. Most topics are discussed first at a level accessible to anyone with a basic knowledge of physical optics, then a more detailed treatment of the topic is undertaken, and finally each topic is supplemented by a reference list of more than 1000 selected original publications in total. Historical development of interferometry The laser as a light source Two-beam interference Techniques for frequency stabilization Coherence Electronic phase measurements Multiple-beam interference Quantum effects in optical interference Extensive coverage of the applications of interferometry, such as measurements of length, optical testing, interference microscopy, interference spectroscopy, Fourier-transform spectroscopy, interferometric sensors, nonlinear interferometers, stellar interferometry, and studies of space-time and gravitation

Basics of Interferometry

Author : P. Hariharan
Publisher : Elsevier
ISBN 13 : 0080465455
Total Pages : 249 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Basics of Interferometry by : P. Hariharan

Download or read book Basics of Interferometry written by P. Hariharan and published by Elsevier. This book was released on 2010-07-28 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical interferometry is used in communications, medical imaging, astonomy, and structural measurement. With the use of an interferometer engineers and scientists are able to complete surface inspections of micromachined surfaces and semiconductors. Medical technicians are able to give more consise diagnoses with the employ of interferometers in microscopy, spectroscopy, and coherent tomography. Originating from a one-day course, this material was expanded to serve as an introduction to the topic for engineers and scientists that have little optical knowledge but a need for more in their daily work lives. The need for interferometry knowledge has crossed the boundaries of engineering fields and Dr. Hariharan has written a book that answers the questions that new practitioners to interferometry have and haven't even thought of yet. Basics of Interferometry, Second Edition includes complete updates of all material with an emphasis on applications. It also has new chapters on white-light microsopy and interference with single photons. Outstanding introduction to the world of optical interferometry with summaries at the begining and end of each chapter, several appendices with essential information, and worked numerical problems Practical details enrich understanding for readers new to this material New chapters on white-light microscopy for medical imaging and interference with single photons(quantum optics)

Optical Interferometry, 2e

Author : P. Hariharan
Publisher : Academic Press
ISBN 13 : 0123116309
Total Pages : 369 pages
Book Rating : 4.1/5 (231 download)

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Book Synopsis Optical Interferometry, 2e by : P. Hariharan

Download or read book Optical Interferometry, 2e written by P. Hariharan and published by Academic Press. This book was released on 2003-09-22 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology, sensor and measurement industries depend on these advances in optical interferometry for accuracy and profitability.

Optical Interferometry for Biology and Medicine

Author : David D. Nolte
Publisher : Springer Science & Business Media
ISBN 13 : 1461408903
Total Pages : 355 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis Optical Interferometry for Biology and Medicine by : David D. Nolte

Download or read book Optical Interferometry for Biology and Medicine written by David D. Nolte and published by Springer Science & Business Media. This book was released on 2011-12-04 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamental physics of optical interferometry as applied to biophysical, biological and medical research. Interference is at the core of many types of optical detection and is a powerful probe of cellular and tissue structure in interfererence microscopy and in optical coherence tomography. It is also the root cause of speckle and other imaging artefacts that limit range and resolution. For biosensor applications, the inherent sensitivity of interferometry enables ultrasensitive detection of molecules in biological samples for medical diagnostics. In this book, emphasis is placed on the physics of light scattering, beginning with the molecular origins of refraction as light propagates through matter, and then treating the stochastic nature of random fields that ultimately dominate optical imaging in cells and tissue. The physics of partial coherence plays a central role in the text, with a focus on coherence detection techniques that allow information to be selectively detected out of incoherent and heterogeneous backgrounds. Optical Interferometry for Biology and Medicine is divided into four sections. The first covers fundamental principles, and the next three move up successive scales, beginning with molecular interferometry (biosensors), moving to cellular interferometry (microscopy), and ending with tissue interferometry (biomedical). An outstanding feature of the book is the clear presentation of the physics, with easy derivations of the appropriate equations, while emphasizing "rules of thumb" that can be applied by experimental researchers to give semi-quantitative predictions.

Interferometry

Author : W. H. Steel
Publisher : Cambridge University Press
ISBN 13 : 9780521311625
Total Pages : 328 pages
Book Rating : 4.3/5 (116 download)

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Book Synopsis Interferometry by : W. H. Steel

Download or read book Interferometry written by W. H. Steel and published by Cambridge University Press. This book was released on 1985-12-27 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enlarged and updated in 1983, this is the second edition of Dr Steel's popular textbook on interferometry. The text has been revised throughout and major additions have been made to reflect the phenomenal growth of laser techniques and applications. The book provides a general treatment that brings together the many different applications of the interference of light waves, light being used in its most general sense to include all electromagnetic radiation. The applications can cover precise measurement of length, the testing of optical components against a computed hologram, measurements of atmospheric pollution by infrared spectroscopy and many of the methods of radio astronomy and the measurement of size of visible stars. These apparently unrelated methods have a common theory, which the book presents and extends to each main field of application. It shows workers in one field how their problems relate to those in other fields, where they may have been solved already. The book will be found useful by anyone whose work involves one of the many applications of interferometric techniques.

Laser Interferometry...

Author :
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Laser Interferometry... by :

Download or read book Laser Interferometry... written by and published by . This book was released on 2000 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Landmark Papers on Photorefractive Nonlinear Optics

$Download Landmark Papers on Photorefractive Nonlinear Optics PDF Online Free$

Author : Pochi Yeh
Publisher : World Scientific
ISBN 13 : 9789810214432
Total Pages : 628 pages
Book Rating : 4.2/5 (144 download)

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Book Synopsis Landmark Papers on Photorefractive Nonlinear Optics by : Pochi Yeh

Download or read book Landmark Papers on Photorefractive Nonlinear Optics written by Pochi Yeh and published by World Scientific. This book was released on 1995 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, intended for students, researchers and engineers, is a collection of classic papers on photorefractive nonlinear optics. Included are landmark papers on fundamental photorefractive phenomena, two-wave mixing, four-wave mixing, phase conjugators and resonators, material growth and physics, and applications in image processing, optical storage and optical computing.

Handbook of Holographic Interferometry

Author : Thomas Kreis
Publisher : John Wiley & Sons
ISBN 13 : 3527604928
Total Pages : 554 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Handbook of Holographic Interferometry by : Thomas Kreis

Download or read book Handbook of Holographic Interferometry written by Thomas Kreis and published by John Wiley & Sons. This book was released on 2006-04-20 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the principles and methods of holographic interferometry - a coherent-optical measurement technique for deformation and stress analysis, for the determination of refractive-index distributions, or applied to non-destructive testing. Emphasis of the book is on the quantitative computer-aided evaluation of the holographic interferograms. Based upon wave-optics the evaluation methods, their implementation in computer-algorithms, and their applications in engineering are described.