Atmospheric Applications of Broadband Cavity Ringdown Spectroscopy PDF Download

Author: Alexander James Leonard Shillings
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Giel Berden
Publisher: John Wiley & Sons
ISBN: 9781444308242
Category : Science
Languages : en
Pages : 344

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Book Description
Cavity Ring-Down Spectroscopy: Techniques and Applications provides a practical overview of this valuable analytical tool, explaining the fundamental concepts and experimental methods, and illustrating important applications. Designed as both an introductory text and a reference source, this book is relevant for scientists unfamiliar with CRDS who are interested in using the technique in their research, as well as experienced users.

Author: Mario Bitter
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Andrey I. Meshkov
Publisher:
ISBN:
Category : Absorption spectra
Languages : en
Pages : 146

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Abstract: It has been known for more than sixty years that all of the atmospheric absorption can not be accounted for by the standard lineshape theory. Remarkably, to this day there is no consensus on the physical origin of the "excess" absorption, called an atmospheric continuum. This is certainly due in no small part to the lack of accurate laboratory measurements, performed for a wide range of pressures, temperatures and frequencies. Unlike in low pressure gas phase spectroscopy where rapid change in the narrow lines absorption is used to remove the slowly varying baseline, quantification of slowly varying with frequency atmospheric absorption is much more difficult. In this thesis we will describe the instrument for the measurement of continua and other slowly varying absorption phenomena in the millimeter and submillimeter (a.k.a. terahertz) spectral region. By replacing the traditional frequency domain phase lock measurement of cavity Q with the time domain cavity ringdown this instrument can measure continua and broad line absorptions at ~6000 distinct cavity frequencies from 170 to 260 GHz in ~ 3 seconds. These near simultaneous measurements can include both regions dominated by contributions from near line center effects and other regions where "continua" effects are important. The result is a data set that contains, without the use of parameters from other experiments, all of the required experimental information. This approach significantly reduces systematic effects and makes possible more realistic assessment of errors. The instrument was used to study the absorption of nitrogen, oxygen, dry and moist air at a number of temperatures in -40 to +70 C range and pressures from 0 to 3 atmospheres. Results of the measurements were compared with current absorption models and previous laboratory measurements. In addition, we have used the developed technique to study the pressure broadening and pressure shift temperature behavior of the 183.310 GHz water line, important in the atmospheric remote sensing.

Author: Justin Mohsen Langridge
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: James McChesney Hargrove
Publisher:
ISBN:
Category : Ammonium nitrate
Languages : en
Pages : 298

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Author: Weidong Chen
Publisher: Elsevier
ISBN: 0128156899
Category : Science
Languages : en
Pages : 634

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Book Description
Advances in Spectroscopic Monitoring of the Atmosphere provides a comprehensive overview of cutting-edge technologies and monitoring applications. Concepts are illustrated by numerous examples with information on spectroscopic techniques and applications widely distributed throughout the text. This information is important for researchers to gain an overview of recent developments in the field and make informed selections among the most suitable techniques. This volume also provides information that will allow researchers to explore implementing and developing new diagnostic tools or new approaches for trace gas and aerosol sensing themselves. Advances in Spectroscopic Monitoring of the Atmosphere covers advanced and newly emerging spectroscopic techniques for optical metrology of gases and particles in the atmosphere. This book will be a valuable reference for atmospheric scientists, including those whose focus is applying the methods to atmospheric studies, and those who develop instrumentation. It will also serve as a useful introduction to researchers entering the field and provide relevant examples to researchers and students developing and applying optical sensors for a variety of other scientific, technical, and industrial uses. Overview of new applications including remote sensing by UAV, laser heterodyne radiometry, dual comb spectroscopy, and more Features in-situ observations and measurements for real-world data Includes content on leading edge optical sensors

Author: Johannes Lodewijk Naus
Publisher:
ISBN:
Category :
Languages : en
Pages : 128

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Author: Gianluca Gagliardi
Publisher: Springer
ISBN: 3642400035
Category : Science
Languages : en
Pages : 537

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The book reviews the dramatic recent advances in the use of optical resonators for high sensitivity and high resolution molecular spectroscopy as well as for chemical, mechanical and physical sensing. It encompasses a variety of cavities including those made of two or more mirrors, optical fiber loops, fiber gratings and spherical cavities. The book focuses on novel techniques and their applications. Each chapter is written by an expert and/or pioneer in the field. These experts also provide the theoretical background in optics and molecular physics where needed. Examples of recent breakthroughs include the use of frequency combs (Nobel prize 2005) for cavity enhanced sensing and spectroscopy, the use of novel cavity materials and geometries, the development of optical heterodyne detection techniques combined to active frequency-locking schemes. These methods allow the use and interrogation of optical resonators with a variety of coherent light sources for trace gas detection and sensing of strain, temperature and pressure.

Author: Matthieu Baudelet
Publisher: Elsevier
ISBN: 085709873X
Category : Technology & Engineering
Languages : en
Pages : 601

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Laser spectroscopy is a valuable tool for sensing and chemical analysis. Developments in lasers, detectors and mathematical analytical tools have led to improvements in the sensitivity and selectivity of spectroscopic techniques and extended their fields of application. Laser Spectroscopy for Sensing examines these advances and how laser spectroscopy can be used in a diverse range of industrial, medical, and environmental applications. Part one reviews basic concepts of atomic and molecular processes and presents the fundamentals of laser technology for controlling the spectral and temporal aspects of laser excitation. In addition, it explains the selectivity, sensitivity, and stability of the measurements, the construction of databases, and the automation of data analysis by machine learning. Part two explores laser spectroscopy techniques, including cavity-based absorption spectroscopy and the use of photo-acoustic spectroscopy to acquire absorption spectra of gases and condensed media. These chapters discuss imaging methods using laser-induced fluorescence and phosphorescence spectroscopies before focusing on light detection and ranging, photothermal spectroscopy and terahertz spectroscopy. Part three covers a variety of applications of these techniques, particularly the detection of chemical, biological, and explosive threats, as well as their use in medicine and forensic science. Finally, the book examines spectroscopic analysis of industrial materials and their applications in nuclear research and industry. The text provides readers with a broad overview of the techniques and applications of laser spectroscopy for sensing. It is of great interest to laser scientists and engineers, as well as professionals using lasers for medical applications, environmental applications, military applications, and material processing. Presents the fundamentals of laser technology for controlling the spectral and temporal aspects of laser excitation Explores laser spectroscopy techniques, including cavity-based absorption spectroscopy and the use of photo-acoustic spectroscopy to acquire absorption spectra of gases and condensed media Considers spectroscopic analysis of industrial materials and their applications in nuclear research and industry