Swapan K Saha – författare

Suitable for researchers and graduate students in fluid dynamics, astrophysics, and other areas of physics, this book clearly elucidates the dynamics and behavior of waves and oscillations in various mediums. It presents different types of waves and oscillations that can be observed and studied from macroscopic to microscopic scales. The authors describe applications in astrophysics, include simple exercises to give readers a hands-on grasp of the basics, and provide a large list of bibliographic sources that enable readers to research more technical aspects.

This book deals with various aspects of optical imaging such as technologies and design, evaluation and calibration, and their scientific applications and results. It discusses the fundamental aspects of optical imaging, Fourier optics, and imaging physics with emphasis on image retrieval techniques and anatomy and diagnostics of optical imaging systems. In addition to ray optics, the book describes the technical details of several important instruments, such as spectroscopes, microscopes, telescopes, interferometers, and medical diagnosis-related instruments. Added further are the factors that affect the quality of the images, speckles and holography, and passive and active methods that permit a telescope to achieve diffraction-limited imaging from the ground. The book will be a valuable resource for astronomers and students involved in the design of modern instrumentation or those attempting to make use of data with instrumentation designed by others.

This book deals with various aspects of optical imaging such as technologies and design, evaluation and calibration, and their scientific applications and results. It discusses the fundamental aspects of optical imaging, Fourier optics, and imaging physics with emphasis on image retrieval techniques and anatomy and diagnostics of optical imaging systems. In addition to ray optics, the book describes the technical details of several important instruments, such as spectroscopes, microscopes, telescopes, interferometers, and medical diagnosis-related instruments. Added further are the factors that affect the quality of the images, speckles and holography, and passive and active methods that permit a telescope to achieve diffraction-limited imaging from the ground. The book will be a valuable resource for astronomers and students involved in the design of modern instrumentation or those attempting to make use of data with instrumentation designed by others.

Waves and oscillations are found in large scales (galactic) and microscopic scales (neutrino) in nature. Their dynamics and behavior heavily depend on the type of medium through which they propagate.Waves and Oscillations in Nature: An Introduction clearly elucidates the dynamics and behavior of waves and oscillations in various mediums. It presents different types of waves and oscillations that can be observed and studied from macroscopic to microscopic scales. The book provides a thorough introduction for researchers and graduate students in assorted areas of physics, such as fluid dynamics, plasma physics, optics, and astrophysics. The authors first explain introductory aspects of waves and electromagnetism, including characteristics of waves, the basics of electrostatics and magnetostatics, and Maxwell’s equations. They then explore waves in a uniform media, waves and oscillations in hydrodynamics, and waves in a magnetized medium for homogeneous and nonhomogeneous media. The book also describes types of shock waves, such as normal and oblique shocks, and discusses important details pertaining to waves in optics, including polarization from experimental and observational points of view. The book concludes with a focus on plasmas, covering different plasma parameters, quasilinear and nonlinear aspects of plasma waves, and various instabilities in hydrodynamics and plasmas.

Interferometric observations need snapshots of very high time resolution of the order of (i) frame integration of about 100 Hz or (ii) photon-recording rates of several megahertz (MHz). Detectors play a key role in astronomical observations, and since the explanation of the photoelectric effect by Albert Einstein, the technology has evolved rather fast. The present-day technology has made it possible to develop large-format complementary metal oxide–semiconductor (CMOS) and charge-coupled device (CCD) array mosaics, orthogonal transfer CCDs, electron-multiplication CCDs, electron-avalanche photodiode arrays, and quantum-well infrared (IR) photon detectors. The requirements to develop artifact-free photon shot noise-limited images are higher sensitivity and quantum efficiency, reduced noise that includes dark current, read-out and amplifier noise, smaller point-spread functions, and higher spectral bandwidth. This book aims to address such systems, technologies and design, evaluation and calibration, control electronics, scientific applications, and results.One of the fastest growing applications is signal sensing, especially wavefront sensing for adaptive optics and fringe tracking for interferometry, which is important for long-baseline optical interferometry. The coherence time of the atmosphere is a highly variable parameter. Depending upon the high velocity wind, it varies from <1 ms to 0.1 s. The exposure times are to be selected accordingly, to maximize the signal-to-noise ratio, as well as to freeze the fringe pattern. A large-format photon-counting system, which is an essential tool in the application of optical interferometric imaging, allows accurate photon centroiding and provides the dynamic range needed for measurements of source characteristics. The advent of high-quantum efficiency photon-counting systems vastly increases the sensitivity of high-resolution imaging techniques. Such systems raise the hope of making diffraction-limited images of objects as faint as ~15–16 m_v (visual magnitude).This book deals with the fundamentals of the important aspects of high-resolution imaging, such as electromagnetic radiations, particularly, optical wavelengths and their distortions due to optical elements and Earth’s atmosphere while passing through a detector; semiconductor physics; lasers; fiber optics; photon-detection process; photodetectors; charge-transfer devices; photon-counting devices in visible wavelength; radiation detectors in infrared wavelengths; and detecting systems for high energies.

Interferometric observations need snapshots of very high time resolution of the order of (i) frame integration of about 100 Hz or (ii) photon-recording rates of several megahertz (MHz). Detectors play a key role in astronomical observations, and since the explanation of the photoelectric effect by Albert Einstein, the technology has evolved rather

This book deals with various aspects of optical imaging such as technologies and design, evaluation and calibration, and their scientific applications and results. It discusses the fundamental aspects of optical imaging, Fourier optics, and imaging physics with emphasis on image retrieval techniques and anatomy and diagnostics of optical imaging systems. In addition to ray optics, the book describes the technical details of several important instruments, such as spectroscopes, microscopes, telescopes, interferometers, and medical diagnosis–related instruments. Added further are the factors that affect the quality of the images, speckles and holography, and passive and active methods that permit a telescope to achieve diffraction-limited imaging from the ground. The book will be a valuable resource for astronomers and students involved in the design of modern instrumentation or those attempting to make use of data with instrumentation designed by others.