Download or read book Self mixing Interferometry and Its Applications in Noninvasive Pulse Detection written by Jukka Hast and published by . This book was released on 2003 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Practical Design and Applications of Medical Devices written by Dilber Uzun Ozsahin and published by Elsevier. This book was released on 2023-11-25 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Practical Design and Applications of Medical Devices focuses on advanced medical device development featuring various biomedical instruments and their applications. The book focuses on devices which receive and transmit bioelectric signals, such as electrocardiograph, electrodes, blood flow, blood pressure, physiological effects and, in some cases, current flowing through the human body. A thorough guide for researchers and engineers in the field of biomedical and instrumentation engineering, this book presents a streamlined medical strategy for designing these medical devices, sensors, and tools. It also promotes operational efficiency in the healthcare industry, with the goals of improving patient safety, lowering overall healthcare costs, broadening access to healthcare services, and improving accessibility. - Covers the fundamental principles of medical and biological instrumentation, as well as the typical features of its design and construction - Provides various methods of designing modern medical devices - Focuses on specific devices with detailed functions, applications, and how they measure and transmit data

Download or read book Rutherford s Vascular Surgery E Book written by Jack L. Cronenwett and published by Elsevier Health Sciences. This book was released on 2014-03-12 with total page 3288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published in association with the Society for Vascular Surgery, Rutherford’s Vascular Surgery presents state-of-the-art updates on all aspects of vascular health care. Extensively revised by many new authors to meet the needs of surgeons, interventionalists, and vascular medicine specialists, this medical reference book incorporates medical, endovascular and surgical treatment, as well as diagnostic techniques, decision making and fundamental vascular biology. Consult this title on your favorite e-reader, conduct rapid searches, and adjust font sizes for optimal readability. Master the latest developments, techniques, and approaches with thorough updates on endovascular applications, vascular access, imaging, non-operative management, and much more. View clinical and physical findings and operative techniques more vividly with a full-color layout and images. Get answers you can depend on. Rutherford's delivers the world’s most trusted information on all major areas of vascular health care, is written by international experts, and includes up-to-date bibliographies and annotated recommended references. Discover emerging techniques in rapidly advancing topics, with special emphasis on endovascular coverage, vascular imaging, angiography, CT and MRI. Explore brand new chapters on dialysis catheters, renovascular disease, and management of branches during endovascular aneurysm. Stay up-to-date with the latest coverage of endovascular procedures that reflects the changing practices and techniques in vascular surgery. Access videos at Expert Consult.

Download or read book Rutherford s Vascular Surgery 2 Volume Set written by Jack L. Cronenwett and published by Elsevier Health Sciences. This book was released on 2010-03-09 with total page 8124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rutherford's Vascular Surgery - the most acclaimed comprehensive reference in its field - presents definitive, state-of-the-art guidance on every aspect of vascular health care, equipping you to make the best clinical decisions and optimize outcomes. Extensively revised by many new, international authors - led by Drs. Jack Cronenwett and K. Wayne Johnston - and now published in association with the Society for Vascular Surgery, this 7th Edition provides the authoritative answers that surgeons, interventionalists, and vascular medicine specialists need to provide effective care for vascular surgery patients. Consult this title on your favorite e-reader with intuitive search tools and adjustable font sizes. Elsevier eBooks provide instant portable access to your entire library, no matter what device you’re using or where you’re located. Get answers you can depend on. Now published in association with the Society for Vascular Surgery, Rutherford's delivers the world’s most trusted information on all major areas of vascular health care, written by international experts, with up-to-date bibliographies and annotated recommended references. Overcome any clinical challenge with in-depth sections on Fundamental Considerations, Patient Evaluation, Atherosclerotic Risk Factors, Perioperative Care, Bleeding and Clotting, Complications, Venous Disease, Lymphedema, Arteriovenous Anomalies, Hemodialysis Access, Miscellaneous Technique, Grafts and Devices, Cerebrovascular Disease, Lower Extremity Arterial Disease, Upper Extremity Arterial Disease, Arterial Aneurysms, Renal and Mesenteric Disease, and Trauma and Acute Limb Ischemia. Choose the best management option for each patient with discussions of operative, endovascular, and non-operative approaches for vascular conditions. Access the complete contents of Rutherford's Vascular Surgery online at www.expertconsult.com - with monthly updates from the Journal of Vascular Surgery and the European Journal of Vascular and Endovascular Surgery, plus videos of procedures, an image library, review questions, and more. Master the latest developments, techniques, and approaches with thorough updates on endovascular applications, vascular access, imaging, non-operative management, and much more. View clinical and physical findings and operative techniques more vividly with a new full-color layout and more full-color images.

Download or read book Advanced Biomedical Engineering written by Gaetano Gargiulo and published by BoD – Books on Demand. This book was released on 2011-08-23 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of recent and extended academic works in selected topics of biomedical signal processing, bio-imaging and biomedical ethics and legislation. This wide range of topics provide a valuable update to researchers in the multidisciplinary area of biomedical engineering and an interesting introduction for engineers new to the area. The techniques covered include modelling, experimentation and discussion with the application areas ranging from acoustics to oncology, health education and cardiovascular disease.

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.

Download or read book Rutherford s Vascular Surgery and Endovascular Therapy E Book written by Anton N Sidawy and published by Elsevier Health Sciences. This book was released on 2018-04-03 with total page 2838 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through nine outstanding editions, Rutherford's Vascular Surgery and Endovascular Therapy has been the gold standard text in this fast-changing, complex field. Published in association with the Society for Vascular Surgery, this state-of-the-art reference by Drs. Anton N. Sidawy and Bruce A. Perler is a must-have for vascular surgeons, interventionalists, vascular medicine specialists, and trainees, as well as general surgeons, interventional radiologists, and cardiologists that depend upon "Rutherford’s" in their practice. It offers authoritative guidance from the most respected and innovative global thought leaders and clinical and basic science experts in the diagnosis and treatment of circulatory disease. Incorporates medical, endovascular, and surgical treatment, as well as diagnostic techniques, decision making, and fundamental vascular biology. Features all vascular imaging techniques, offering a non-invasive evaluation of both the morphology and hemodynamics of the vascular system. Provides unparalleled insight from multidisciplinary leaders worldwide, who share their expertise on the most appropriate contemporary and future treatment of circulatory disease. Employs a full-color layout and images so you can view clinical and physical findings and operative techniques more vividly. Includes 40 new chapters incorporating a shorter, more focused format with a summary for each chapter that provides a quick access to key information – ideal for consultation situations as well as daily practice. Some of these chapters are organized in new sections dedicated to open operative exposure and vessel dissection techniques, diabetic foot, Pediatric Vascular Disease, and practice management issues; areas in the specialty that clinicians frequently face but seldom detailed in other vascular texts nor in earlier Rutherford editions. Covers hot topics such as endovascular therapy of aortic arch and thoracoabdominal aortic aneurysm disease, including the evolving management of aortic dissections. Expert ConsultTM eBook version included with purchase. This enhanced eBook experience allows you to search all of the text, figures, and references from the book on a variety of devices.

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:

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.

Download or read book Implementation of Differential Self mixing Interferometry Systems for the Detection of Nanometric Vibrations written by Francisco Javier Azcona Guerrero and published by . This book was released on 2018 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Thesis, we explore Self-mixing interferometry (SMI ), a method capable of producing high resolution optical path related measurements in a simple, compact and cost-effective way. Even with a notably less complex setup than traditional interferometric methods, SMI can produce measurements with a resolution well below the micrometric scale (N'2) which is sufficient for most industrial applications. The SMI effect is produced when a small part of the laser power impacting a target is back-scattered and re-injected into the laser cavity. As a result, the phase and amplitude of the laser wave is modified generating a signature beat, which can be "easily" related to different optical path-related dynamics. The main advantage of this method in relation to other interferometric methods is the simple setup consisting mainly of a single mode laser diode (LO) equipped with a simple electronic system readout a simple optical system may be used to collimate/focus the beam allowing measurements at larger distances. Because of the small amount of reflected optical power required to allow the effect, the technique can produce high resolution measurements even with diffusive targets. While the SMI method has been largely studied in the last three decades, there are still several topics worth the development of further research. One of those topics, how to increase the resolution on displacement measurements, is one of the main topics covered in this work. Classical SMI methods allow the reconstruction of displacement measurement with a resolution of N'2. The use of special processing algorithms can push further this limit reaching values in the order of e.g. N32. In this work, we propose a method to increase even further this limit reach values better than N100.The idea discussed, differential self-mixing interferometry (OSMI) proposes the use of a reference modulation (mechanical or electrical) to be used as a reference for the measurement. Simulated results have shown that under ideal conditions, it may be possible to reach resolutions in the order of N1000. In practice, however, this limit is much smaller (N100) because of LO dynamics, and different practical limitations present in the amplification and readout electronics. Experiments and measurements are presented along the second chapter of this work to present proof of the proposed method. After exploring the basics of OSMI, possible applications for classic SMI and DSMI were pursued. The obtained results are presented in the following sections. First, a review on potential biomedical measurements using SMI is discussed. The obtained results suggest that it is possible to obtain some key values related to biomedical constants (e.g. P.PW) using a displacement SMI measurement. The method, however, may not be reliable enough especially on long time measurements. Moreover, the use of certain wavelengths must be avoided during long exposures as they may prove harmful to the soft tissue due to the requirements of a small laser spot. lt is observed that SNR may lead to difficulties during the signal processing stage which may impact the results of the reconstructed signal. Next, the DSMI method was tested in an AFM-like cantilever system. The results suggest that is possible to follow the motion of a micrometric size cantilever oscillating at low frequencies with a high resolution. Higher frequencies may be achieved by using an electronic reference modulation configuration. The proposed system was able to detect some artefacts on the motion which maybe attributed to possible deflections on the cantilever surface. Possible enhancements to the method are suggested for any researcher who wants to expand the topic.

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.

Download or read book An Introduction to Self mixing Interferometry with an Application to Vibrometry written by Matthew L. O'Donnell and published by . This book was released on 2008 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quantum Noise Limited Interferometry written by Malcolm B. Gray and published by . This book was released on 1995 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of Coherence Domain Optical Methods in Biomedical Science and Clinical Applications written by and published by . This book was released on 1999 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applications of Interferometry written by William Ewart Williams and published by . This book was released on 1958 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society written by IEEE Engineering in Medicine and Biology Society. Conference and published by . This book was released on 1998 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Laser Doppler Technique written by L. E. Drain and published by John Wiley & Sons. This book was released on 1980 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: