Download or read book Advanced Optical Diagnostics of Atmospheric Pressure Plasma written by Qing Xiong and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric-pressure plasma has been employed in various applications including bio-medicine, environmental pollution control, material processing. Diagnostic characterization of plasma sources is critical and indispensable for plasma control and achieving optimized treatment efficiency. In this chapter we will introduce several advanced optical techniques to visualize the detailed physical-and-chemical properties of atmospheric-pressure discharges. Non-invasive approaches of optical emission spectroscopy (OES), schlieren or shadowgraph, invasive methods of active laser spectroscopy including laser-induced fluorescence (LIF), laser or broadband absorption, cavity ring-down spectroscopy (CRDS), and laser scattering are illustrated. Basic plasma parameters of gas temperature, electron density and temperature, electric field strength, and reactive chemical gaseous species (O, H, N, OH, NO, O3, etc.) are able to be monitored. Comparisons and comments of these approaches are provided depending on diagnostic purposes.
Download or read book Atmospheric Pressure Plasma written by Anton Nikiforov and published by BoD – Books on Demand. This book was released on 2019-04-24 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma as the fourth state of matter is an ionized gas consisting of both negative and positive ions, electrons, neutral atoms, radicals, and photons. In the last few decades, atmospheric-pressure plasmas have started to attract increasing attention from both scientists and industry due to a variety of potential applications. Because of increasing interest in the topic, the focus of this book is on providing engineers and scientists with a fundamental understanding of the physical and chemical properties of different atmospheric-pressure plasmas via plasma diagnostic techniques and their applications. The book has been organized into two parts. Part I focuses on the latest achievements in advanced diagnostics of different atmospheric-pressure plasmas. Part II deals with applications of different atmospheric-pressure plasmas.
Download or read book Atmospheric Pressure Plasma from Diagnostics to Applications written by Zhiqiang Chen and published by . This book was released on 2019 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma as the fourth state of matter is an ionized gas consisting of both negative and positive ions, electrons, neutral atoms, radicals, and photons. In the last few decades, atmospheric-pressure plasmas have started to attract increasing attention from both scientists and industry due to a variety of potential applications. Because of increasing interest in the topic, the focus of this book is on providing engineers and scientists with a fundamental understanding of the physical and chemical properties of different atmospheric-pressure plasmas via plasma diagnostic techniques and their applications. The book has been organized into two parts. Part I focuses on the latest achievements in advanced diagnostics of different atmospheric-pressure plasmas. Part II deals with applications of different atmospheric-pressure plasmas.
Download or read book Laser Diagnostics on Atmospheric Pressure Plasma Jets written by Bram van Gessel and published by . This book was released on 2013 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Equilibrium Air Plasmas at Atmospheric Pressure written by K.H. Becker and published by CRC Press. This book was released on 2004-11-29 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric-pressure plasmas continue to attract considerable research interest due to their diverse applications, including high power lasers, opening switches, novel plasma processing applications and sputtering, EM absorbers and reflectors, remediation of gaseous pollutants, excimer lamps, and other noncoherent light sources. Atmospheric-pressu
Download or read book Optical and Electrical Diagnosis of Atmospheric Pressure Plasma Jets written by Andrew West and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optical Emission Diagnostics of a Non equilibrium Atmospheric Pressure Helium Plasma Jet in Ambient Air written by Eduardo Hernandez and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-thermal atmospheric pressure plasmas are increasingly attracting more attention from the scientific community for their potential use in surface treatment and biomedical applications. Even though considerable progress has been made, investigation of the species generated at close proximity (1 mm to ~100 nm) to a surface has not been addressed due to limitations of common optical techniques. A novel approach using Optical Emission Spectroscopy (OES) that can probe emissions over this distance away from the surface has been investigated. Additionally, the presence of high energy VUV photons was confirmed and these can play an important role in the propagation of plasma jets. By performing temporally resolved OES, it was determined that excitation of O, N, OH, NO and N2+ is predominantly due to collisions between He* and their precursors, whereas the N2 emissions are due to electron impact that produces electronically excited N2.
Download or read book Plasma Diagnostics written by Orlando Auciello and published by Academic Press. This book was released on 2013-10-22 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Diagnostics, Volume 1: Discharge Parameters and Chemistry covers seven chapters on the important diagnostic techniques for plasmas and details their use in particular applications. The book discusses optical diagnostic techniques for low pressure plasmas and plasma processing; plasma diagnostics for electrical discharge light sources; as well as Langmuir probes. The text also describes the mass spectroscopy of plasmas, microwave diagnostics, paramagnetic resonance diagnostics, and diagnostics in thermal plasma processing. Electrical engineers, nuclear engineers, microwave engineers, chemists, and technical personnel in universities, industry, and national laboratories will find the book invaluable.
Download or read book Topics in Plasma Diagnostics written by I. Podgornyi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present volume is essentially a qualitative survey of modern trends in the diagnostics of high-temperature plasmas, with particular orientation toward laboratory plasmas of interest in connection with research in controlled thermonuclear fusion. Among the broad topics considered are probe diagnostics, optical methods (including the use of lasers and holography), microwave diagnostics, and diagnostics with particle beams. Having infor mation on these methods available in compact form and in one place, as is the case in the present volume, should make it pos sible to evaluate different diagnostic approaches to specific prob lems. The volume will be useful as an introduction for advanced students making their first contact with experimental plasma physics and for physicists and engineers who are entering the field and desire a rapid survey of principles and modern trends in the diagnostics of high-temperature plasmas. v Foreword to the American Edition The material in this book is based on lectures given at Mos cow State University. It is intended to acquaint the reader with the basic aspects of plasma diagnostics and contains information re quired for the experimental physicist who wishes to carry out straightforward measurements of laboratory plasmas. It will be evident that in choosing the material we have been guided pri marily by the scientific interests of the author, and the great bulk of the material is based on work carried out in the USSR.
Download or read book Investigation of Plasma Excitation Volume III Advanced Optical Diagnostics of Plasmas written by C. A. DeJoseph and published by . This book was released on 1981 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fourier transform infrared spectrometer was used to identify infrared absorption spectra of impurities that might be present in carbon dioxide laser discharges. Spectral regions free from interference from the primary constituents and common impurities such as water vapor were identified for several of the nitrogen oxides, and the detection sensitivities were determined. This information was used in a study of impurity buildup during discharges in an electron-beam excited closed cycle (EBCC) system and in a TEA CO2 laser. It was found that after an hour of irradiation in the continuous EBCC system, the oxides of nitrogen had built up to the ten parts per mission range while the carbon monoxide concentration was of the order of a few hundred parts per million. When the initial gas mix contained oxygen, the concentration of carbon monoxide and the nitrogen oxides increased. The addition of hydrogen to an oxygen free gas mix was found to produce water vapor at about ten percent of the initial hydrogen concentration, increase the production of N20 and of CO, and decrease the production of NO and NO2. A technique has been developed for determining the rotational temperature and vibrational population distribution of non-homonuclear molecules under nonequilibrium conditions. The technique was applied to carbon monoxide under the conditions present in an electrical discharge.
Download or read book Investigation of Plasma Excitation written by C. A. DeJoseph and published by . This book was released on 1981 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fourier transform infrared spectrometer was used to identify infrared absorption spectra of impurities that might be present in carbon dioxide laser discharges. Spectral regions free from interference from the primary constituents and common impurities such as water vapor were identified for several of the nitrogen oxides, and the detection sensitivities were determined. This information was used in a study of impurity buildup during discharges in an electron-beam excited closed cycle (EBCC) system and in a TEA CO2 laser. It was found that after an hour of irradiation in the continuous EBCC system, the oxides of nitrogen had built up to the ten parts per mission range while the carbon monoxide concentration was of the order of a few hundred parts per million. When the initial gas mix contained oxygen, the concentration of carbon monoxide and the nitrogen oxides increased. The addition of hydrogen to an oxygen free gas mix was found to produce water vapor at about ten percent of the initial hydrogen concentration, increase the production of N20 and of CO, and decrease the production of NO and NO2. A technique has been developed for determining the rotational temperature and vibrational population distribution of non-homonuclear molecules under nonequilibrium conditions. The technique was applied to carbon monoxide under the conditions present in an electrical discharge.
Download or read book Measurement of Atmospheric Pressure Air Plasma Via Pulsed Electron Beam and Sustaining Electric Field written by and published by . This book was released on 2007 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus to study the generation of plasma in air was designed, fabricated, and assembled. A 400-liter test cell was developed to study plasma in air which has a pressure that can be varied from standard atmospheric pressure at sea level to 1 mTorr at 300,000 ft. Plasma is generated by impact ionization of air due to bombardment by a 100-kev electron beam. Microwave diagnostics quantify electron number density and optical diagnostics quantify ozone production. A particle in cell plasma code (MAGIC) and an air-chemistry code are used to quantify beam propagation through an electron-beam transmission window into air and the volumetric ionization rate within the test cell. Sensors were developed to monitor beam current incident on a transmission window and the resulting plasma formed in air on the transmission side of the window. Diagnostics from multiple sensors are acquired simultaneously for studies of power required to generate and maintain plasma in air on the timescale of 1 ms.
Download or read book Advanced Optical Diagnostics of High Density Etching Plasmas written by and published by . This book was released on 2000 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work was to investigate the use of in-situ spectroscopic ellipsometry as a means to control the etching of III-V semiconductors and in particular an AlGaAs/GaAs heterostructure used to form the emitter/base junction of a heterojunction bipolar transistor (HBT) used in high frequency circuits employed in Air Force communications. The specific objective was to use in-situ SE to monitor the etching of the AlGaAs emitter layer and stop to within a few nanometers of the GaAs base layer. Toward this end, an Electron Cyclotron Resonance (ECR) microwave plasma system and custom built stainless steel bell jar were used to construct an etch tool. The ECR microwave plasma is a low pressure, high density plasma source capable of producing highly anisotropic etch profiles. The ellipsometer used was a J. A. Woollam Co. model M-44. The M-44 is a 44 wavelength ellipsometer operating in the visible region from approx. 400-800 nm.
Download or read book Atmospheric Pressure Plasmas written by Margaret Parker and published by Nova Science Publishers. This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma is one of the most fundamental states of matter other than solid, liquid and gaseous. It consists of positive ions, neutral atoms, electrons, negative ions and neutral or charged molecules can be identified. Generally, plasma can be classified according to its gas temperature. Atmospheric-pressure plasma (APP), is actually a partly ionized gas. Non-equilibrium APP has an ability to produce a mixture of reactive species including, reactive oxygen species (ROS) and reactive nitrogen species (RNS), which can act as biologically active agents. This book discusses the processes, technology and applications of APPs. The first chapter examines the influence of APPs on biomolecules. Chapter Two focuses on the development and application of optical techniques for diagnosing gliding arc discharge at atmospheric pressure, emphasis being placed on gaining a better understanding of the spatial, temporal and spectral discharge characteristics. Chapter Three presents several approaches for such free-form plasma activation of different plastics and polymers based on direct and indirect dielectric barrier discharge (DBD) plasmas. Chapter Four reviews the combination of plasmachemical oxidation PCO and atmospheric pressure chemical vapour deposition APCVD for creating novel functional surfaces. Chapter Five reviews the impact of gas diffusion barrier film synthesis on polymers by atmospheric pressure plasma enhanced chemical vapour deposition. Chapter Six presents and discusses some of the most recent applications of microwave plasmas, with the view of understanding microwave plasma behaviour. Chapter Seven discusses selective synthesis of self-standing carbon nanostructures using microwave driven plasmas at atmospheric pressure conditions. Chapter Eight studies the application of non-thermal atmospheric pressure plasma in textiles. Chapter Nine reviews a current state of the art and opportunities for the use of plasma surface treatment in the coating and conversion of paper products.
Download or read book Plasma Spectroscopy written by Takashi Fujimoto and published by Clarendon Press. This book was released on 2004-06-17 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the characteristics of optical radiation, or a spectrum, emitted by various plasmas. In plasma, the same atomic species can produce quite different spectra, or colours, depending on the nature of the plasma. This book gives a theoretical framework by which a particular spectrum can be interpreted correctly and coherently. The uniqueness of the book lies in its comprehensive treatment of the intensity distribution of spectral lines and the population density distribution among the atomic levels in plasmas. It is intended to provide beginners with a good perspective of the field, laying out the physics in an extremely clear manner and starting from an elementary level. A useful feature of the book is the asterisked sections and chapters which can be skipped by readers who only wish to gain a quick and basic introduction to plasma spectroscopy. It will also be useful to researchers working actively in the field, acting as a guide for carrying out experiments and interpreting experimental observations.
Download or read book Characterization of an Atmospheric Pressure Plasma Jet Using Optical Emission and Cavity Ringdown Spectroscopy written by Shane Moore Clark and published by . This book was released on 2018 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cold plasma is useful in numerous medical applications, largely because of the highly-reactive chemical species generated in the discharge. The hydroxyl radical (OH) is of these species and has significant biological importance. An atmospheric pressure plasma jet (APPJ) was constructed in the form of a plasma pencil, and relative and absolute measurements were made of OH in both its first excited ground state—OH(A) and OH(X), respectively—using optical emission spectroscopy and cavity ring-down spectroscopy (CRDS). The total number of OH radicals were found to be constant in the plume and within the range given by relative measurements made on similar devices in the literature.
Download or read book Advanced Optical Diagnostics in High Speed Flows written by M. Samimy and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
