Download or read book System Design for Frequency Quadrupling of Reference Clock for a Swept Source Spectral Domain Optical Coherence Tomography written by Karthick Santhanam and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A real time system design to quadruple the frequency of the optical clock that is linear in the optical k-space domain is presented for a swept source spectral domain based polarization sensitive optical coherence tomography system. Advanced OCT imaging techniques have been developed in recent times to obtain high resolution images of retina that may help in early detection of glaucoma. Spatial resolution (sharper details) and depth of such images is of paramount importance. Use of a non-linear clocking system (that is linear in k-space domain) to acquire the sample is shown to be essential in avoiding loss of image resolution. The clock system described in this thesis represents an improvement over current clocking system in terms of faster and better acquisition of samples. The principle of operation and circuit implementation are described in this thesis. A fully functional hardware system has been developed and experimental results are recorded, presented and verified. By using the quadrupled frequency clock (linear in optical k-space domain) in the swept source spectral domain PS-OCT system, significant enhancement has been demonstrated in the axial resolution and depth range of acquired images.
Download or read book Swept Source Optical Coherence Tomography System Development for Bioimaging Applications written by Luoqin Yu and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Domain Optical Coherence Tomography System Design written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Swept Source Optical Coherence Tomography System Development for Bioimaging Applications written by 俞罗琴 and published by . This book was released on 2015 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time and Frequency Users Manual written by George Kamas and published by . This book was released on 1977 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Applications of 4D Real time Multi functional Spectral domain Optical Coherence Tomography written by Yan Wang and published by . This book was released on 2013 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 1 describes the construction and characterization of a multi-functional SD-OCT system at 1300nm. The axial resolution, lateral resolution, imaging depth, signal sensitivity drop-off, spectrometer efficiency, phase noise, system noise, polarization noise, computation of phase retardation, optic axis and diattenuation were characterized. Multiple samples were imaged to demonstrate each imaging facet (intensity, polarization and flow) of the system.
Download or read book Development of Phase Stabilized Swept Source Optical Coherence Tomography for Biomedical Imaging and Sensing written by Ravi Kiran Manapuram and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral domain Optical Coherence Tomography on a Silicon Chip written by and published by . This book was released on 2012 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Domain Optical Coherence Tomography written by and published by . This book was released on 2008 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Construction of a Fast Spectrometer for Fourier Domain Optical Coherence Tomography written by Manish Kankaria and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A fast spectrometer capable of operating at 27.8 KHz is designed and calibrated to work in the wavelength range of 700-900 nm, to perform Fourier Domain Optical Coherence Tomography (FD-OCT). The OCT system is based on fiber-based Michelson's interferometer set up utilizing the spectrometer at the detector end. In FDOCT system no reference scanning is necessary and hence images can be acquired at a much faster rate without any penalty to signal-to-noise ratio (SNR). A broadband Ti-sapphire source is used as input to the interferometer. Data at the rate of 60 MHz is acquired from the spectrometer using a frame grabber and a DAQ card is used for synchronization and scanning of the galvanometers in the sample path. Lab-VIEW(TM) is used as interface for data collection and processing. The theoretical resolution of the spectrometer is calculated to be 0.11 nm resulting in the measurable depth range of 1.54 mm. Signal-to-noise for the system was experimentally found to be 52.05 dB. Video-rate OCT image acquisition capability of the FD-OCT system is demonstrated.
Download or read book Optical Coherence Tomography written by Michael A. Choma and published by . This book was released on 2004 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Global Trends 2040 written by National Intelligence Council and published by Cosimo Reports. This book was released on 2021-03 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The ongoing COVID-19 pandemic marks the most significant, singular global disruption since World War II, with health, economic, political, and security implications that will ripple for years to come." -Global Trends 2040 (2021) Global Trends 2040-A More Contested World (2021), released by the US National Intelligence Council, is the latest report in its series of reports starting in 1997 about megatrends and the world's future. This report, strongly influenced by the COVID-19 pandemic, paints a bleak picture of the future and describes a contested, fragmented and turbulent world. It specifically discusses the four main trends that will shape tomorrow's world: - Demographics-by 2040, 1.4 billion people will be added mostly in Africa and South Asia. - Economics-increased government debt and concentrated economic power will escalate problems for the poor and middleclass. - Climate-a hotter world will increase water, food, and health insecurity. - Technology-the emergence of new technologies could both solve and cause problems for human life. Students of trends, policymakers, entrepreneurs, academics, journalists and anyone eager for a glimpse into the next decades, will find this report, with colored graphs, essential reading.
Download or read book The Sparse Fourier Transform written by Haitham Hassanieh and published by Morgan & Claypool. This book was released on 2018-02-27 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Fourier transform is one of the most fundamental tools for computing the frequency representation of signals. It plays a central role in signal processing, communications, audio and video compression, medical imaging, genomics, astronomy, as well as many other areas. Because of its widespread use, fast algorithms for computing the Fourier transform can benefit a large number of applications. The fastest algorithm for computing the Fourier transform is the Fast Fourier Transform (FFT), which runs in near-linear time making it an indispensable tool for many applications. However, today, the runtime of the FFT algorithm is no longer fast enough especially for big data problems where each dataset can be few terabytes. Hence, faster algorithms that run in sublinear time, i.e., do not even sample all the data points, have become necessary. This book addresses the above problem by developing the Sparse Fourier Transform algorithms and building practical systems that use these algorithms to solve key problems in six different applications: wireless networks; mobile systems; computer graphics; medical imaging; biochemistry; and digital circuits. This is a revised version of the thesis that won the 2016 ACM Doctoral Dissertation Award.
Download or read book Electronic Warfare and Radar Systems Engineering Handbook written by and published by . This book was released on 1997-04-01 with total page 605 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is designed to aid electronic warfare and radar systems engineers in making general estimations regarding capabilities of systems. It is not intended as a detailed designer's guide, due to space limitations. Portions of the handbook and future changes will be posted on an internet link.
Download or read book Astrophysical Lasers written by Vladilen Letokhov and published by OUP Oxford. This book was released on 2008-12-18 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in modern radio astronomy led to the discovery of space masers in the microwave range, and it became a powerful tool for studies of interstellar star-forming molecular clouds. Progress in observational astronomy, particularly with ground-based huge telescopes and the space-based Hubble Space Telescope, has led to recent discoveries of space lasers in the optical range. These operate in gas condensations in the vicinity of the mysterious star Eta Carinae (one of the most luminous and massive stars of our Galaxy). Both maser and laser effects, first demonstrated under laboratory conditions, have now been discovered to occur under natural conditions in space too. This book describes consistently the elements of laser science, astrophysical plasmas, modern astronomical observation techniques, and the fundamentals and properties of astrophysical lasers. A book with such an interdisciplinary scope has not been available to date. The book will also be useful for a wider audience interested in modern developments of the natural sciences and technology.
Download or read book High Speed Serdes Devices and Applications written by David Robert Stauffer and published by Springer Science & Business Media. This book was released on 2008-12-19 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simplest method of transferring data through the inputs or outputs of a silicon chip is to directly connect each bit of the datapath from one chip to the next chip. Once upon a time this was an acceptable approach. However, one aspect (and perhaps the only aspect) of chip design which has not changed during the career of the authors is Moore’s Law, which has dictated substantial increases in the number of circuits that can be manufactured on a chip. The pin densities of chip packaging technologies have not increased at the same pace as has silicon density, and this has led to a prevalence of High Speed Serdes (HSS) devices as an inherent part of almost any chip design. HSS devices are the dominant form of input/output for many (if not most) high-integration chips, moving serial data between chips at speeds up to 10 Gbps and beyond. Chip designers with a background in digital logic design tend to view HSS devices as simply complex digital input/output cells. This view ignores the complexity associated with serially moving billions of bits of data per second. At these data rates, the assumptions associated with digital signals break down and analog factors demand consideration. The chip designer who oversimplifies the problem does so at his or her own peril.
Download or read book Intellectual property rights in an age of electronics and information written by and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
