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Backscatter and Transmission of Aerosol at UV Through Middle IR Wavelengths

Backscatter and Transmission of Aerosol at UV Through Middle IR Wavelengths
Author: S. G. Jennings
Publisher:
Total Pages: 0
Release: 1993
Genre: Air
ISBN:

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Simultaneous measurements of backscatter and transmission coefficients, sigma b and sigma e for obscuring and biological aerosols using a Nd:Yag pulsed laser system at 1064, 532, and 266 nm wavelengths are being investigated in the laboratory. Forward scattering measurements are obtained at wavelengths 1064 and 532 nm for water droplet polydispersions and compares favourably with theoretical values for relatively narrow size distributions. However, for broader size distribution, the contribution by forward scattered radiation to the estimation signal is significant and needs to be accounted for in extinction and backscatter measurements. The aerosol chamber for obscuring (carbon powder) aerosol is described. Measurements of pollen and spore biological aerosol using an array of passive Tauber traps are presented. Percentage counts as well as species concentration values are given for seven sites in the west of Ireland covering the period from November 1992 through May 1993. Backscatter, Transmission, Biological aerosol, Spore, Pollen.


Backscatter and Transmission of Aerosol at UV Through Middle IR Wavelengths

Backscatter and Transmission of Aerosol at UV Through Middle IR Wavelengths
Author:
Publisher:
Total Pages: 28
Release: 1997
Genre:
ISBN:

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A Continuum Surelite 10 Hz Nd:Yag laser system was purchased for these measurements. It included second, third, and fourth harmonic generators. After setup, beam profiles were made, and the apparatus was configured to measure backscatter and extinction of laser radiation due to aerosol and cloud polydispersions. Simultaneous measurements of backscatter and transmission coefficients for obscuring carbon and biological aerosols were investigated in the laboratory at wavelengths of 1064, 532, 355, and 266 nm. Water clouds also were well characterized.


Government Reports Annual Index

Government Reports Annual Index
Author:
Publisher:
Total Pages: 1144
Release: 1994
Genre: Government reports announcements & index
ISBN:

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Scattering, Two-Volume Set

Scattering, Two-Volume Set
Author: E. R. Pike
Publisher: Elsevier
Total Pages: 1831
Release: 2001-10-09
Genre: Science
ISBN: 0080540732

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Scattering is the collision of two objects that results in a change of trajectory and energy. For example, in particle physics, such as electrons, photons, or neutrons are "scattered off" of a target specimen, resulting in a different energy and direction. In the field of electromagnetism, scattering is the random diffusion of electromagnetic radiation from air masses is an aid in the long-range sending of radio signals over geographic obstacles such as mountains. This type of scattering, applied to the field of acoustics, is the spreading of sound in many directions due to irregularities in the transmission medium. Volume I of Scattering will be devoted to basic theoretical ideas, approximation methods, numerical techniques and mathematical modeling. Volume II will be concerned with basic experimental techniques, technological practices, and comparisons with relevant theoretical work including seismology, medical applications, meteorological phenomena and astronomy. This reference will be used by researchers and graduate students in physics, applied physics, biophysics, chemical physics, medical physics, acoustics, geosciences, optics, mathematics, and engineering. This is the first encyclopedic-range work on the topic of scattering theory in quantum mechanics, elastodynamics, acoustics, and electromagnetics. It serves as a comprehensive interdisciplinary presentation of scattering and inverse scattering theory and applications in a wide range of scientific fields, with an emphasis, and details, up-to-date developments. Scattering also places an emphasis on the problems that are still in active current research. The first interdisciplinary reference source on scattering to gather all world expertise in this technique Covers the major aspects of scattering in a common language, helping to widening the knowledge of researchers across disciplines The list of editors, associate editors and contributors reads like an international Who's Who in the interdisciplinary field of scattering


Springer Series in Light Scattering

Springer Series in Light Scattering
Author: Alexander Kokhanovsky
Publisher: Springer
Total Pages: 301
Release: 2017-12-22
Genre: Science
ISBN: 3319708082

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This book presents a survey of modern theoretical and experimental techniques in studies of light scattering phenomena and radiative transfer processes in random media. It presents reviews on light scattering by sea water and bubbles, and includes a separate chapter addressing studies of the remote sensing of crystalline clouds with a focus on the shape of particles—a parameter rarely studied by passive remote sensing techniques. In particular, it offers a comprehensive analysis of polarized radiative transfer in optically active (e.g., chiral) light scattering media and explores advances in spectro-polarimetry of particulate media. Lastly it discusses new developments in light scattering for combustion monitoring.


Handbook of Humidity Measurement, Volume 1

Handbook of Humidity Measurement, Volume 1
Author: Ghenadii Korotcenkov
Publisher: CRC Press
Total Pages: 372
Release: 2018-03-15
Genre: Science
ISBN: 1351400657

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The first volume of The Handbook of Humidity Measurement focuses on the review of devices based on optical principles of measurement such as optical UV, fluorescence hygrometers, optical and fiber-optic sensors of various types. Numerous methods for monitoring the atmosphere have been developed in recent years, based on measuring the absorption of electromagnetic field in different spectral ranges. These methods, covering the optical (FTIR and Lidar techniques), as well as a microwave and THz ranges are discussed in detail in this volume. The role of humidity-sensitive materials in optical and fiber-optic sensors is also detailed. This volume describes the reasons for controlling the humidity, features of water and water vapors, and units used for humidity measurement.