Experimental Investigations of Optical Propagation in Atmospheric Turbulence

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ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Experimental Investigations of Optical Propagation in Atmospheric Turbulence by : Michael W. Fitzmaurice

Download or read book Experimental Investigations of Optical Propagation in Atmospheric Turbulence written by Michael W. Fitzmaurice and published by . This book was released on 1971 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pertinent theoretical background and the results of a group of experiments conducted over 0.4- and 1.17-km near-ground horizontal ranges are presented. (1) The log-amplitude variances for HeNe (0.633 μm) and CO2 (10.6 μm) laser beams were found to have a ratio of 26.8, which is in close agreement with the predictions of Rytov-based spherical-wave theory. (2) Published measurements of the saturation level of the log-amplitude variance are reviewed and several inconsistencies noted. (3) The spatial correlation function of irradiance field was measured and found to agree with theory. The degree of correlation between different frequency beams which had traversed the same optical path was also measured and compared to theory. The data exhibited an unacceptably large scatter and did not show the wavelength dependence. (4) The log-normal, Rayleigh, and Rice probability distributions are discussed in terms of their applicability to irradiance statistics. Relatively weak 10.6 μm irradiance fluctuations were found to be equally well described by the log-normal and Rice distributions; strong fluctuations obtained at 0.488 μm were clearly best described by the log-normal distribution.

Experimental Investigations of Optical Propagation in Atmospheric Turbulence

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ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Experimental Investigations of Optical Propagation in Atmospheric Turbulence by : Michael W. Fitzmaurice

Download or read book Experimental Investigations of Optical Propagation in Atmospheric Turbulence written by Michael W. Fitzmaurice and published by . This book was released on 1971 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pertinent theoretical background and the results of a group of experiments conducted over 0.4- and 1.17-km near-ground horizontal ranges are presented. (1) The log-amplitude variances for HeNe (0.633 μm) and CO2 (10.6 μm) laser beams were found to have a ratio of 26.8, which is in close agreement with the predictions of Rytov-based spherical-wave theory. (2) Published measurements of the saturation level of the log-amplitude variance are reviewed and several inconsistencies noted. (3) The spatial correlation function of irradiance field was measured and found to agree with theory. The degree of correlation between different frequency beams which had traversed the same optical path was also measured and compared to theory. The data exhibited an unacceptably large scatter and did not show the wavelength dependence. (4) The log-normal, Rayleigh, and Rice probability distributions are discussed in terms of their applicability to irradiance statistics. Relatively weak 10.6 μm irradiance fluctuations were found to be equally well described by the log-normal and Rice distributions; strong fluctuations obtained at 0.488 μm were clearly best described by the log-normal distribution.

Experiments for Laser Beam Propagation Through Optical Turbulence

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (113 download)

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Book Synopsis Experiments for Laser Beam Propagation Through Optical Turbulence by : Angel Fernandez

Download or read book Experiments for Laser Beam Propagation Through Optical Turbulence written by Angel Fernandez and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric turbulence, generated by a differential temperature between the Earth's surface and the atmosphere, causes effects on optical waves that have been of great interest to scientists for many years. Wave front distortions in the optical wave induced by atmospheric turbulence result in a spreading of the beam beyond that due to pure diffraction, random variations of the position of the beam centroid, and a random redistribution of the beam energy within a cross section of the beam leading to irradiance fluctuations. Those effects have far-reaching consequences on astronomical imaging, free space optics (FSO) communications, remote sensing, laser satellite communication, astronomical imaging, adaptive optics, target designation, hyperspectral LiDAR, and other applications that require the transmission of optical waves through the atmosphere. Throughout this thesis, we introduce a globally concept of turbulence, focusing in atmospheric turbulence.Diverse experiments have been carried out, for instance, the propagation of two parallel thin beams under geometrical optics condition for studying the parameters of optical turbulence, and besides, the same optical configuration was used to investigate the best sampling rate for optical turbulence. Furthermore, we have measured evapotranspiration by remote sensing, in which we have heeded the fluctuations of the refractive index through the intensities of the turbulence. Finally, experiments which involve a new beam are also developed, such as phase-flipped Gaussian beam. This beam shows an experimental reduction on its irradiance fluctuations induced by the turbulence, which means that it has a high performance in optical communications. The experimental reduction aforementioned is proved through the comparison with the theory developed.

Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (892 download)

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Book Synopsis Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere by : Christopher Pugh

Download or read book Experimental Investigation Into Spatial Quantum Optical Properties for Satellite Targeting Through the Turbulent Atmosphere written by Christopher Pugh and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A major field of research at the current time is that of implementing Quantum Key Distribution over large distances using satellites. If this protocol works with this technology, it will have huge implications on future information security. In order for a satellite to implement this idea, there are many aspects that must be taken into account. One of the big issues that comes up for this type of system is that of propagating light through the turbulent atmosphere and its effects on the acquisition, pointing and tracking system. The projects studied in this thesis study some of the effects of the atmosphere on certain detectors, try to develop pointing schemes for better accuracy as well as develop knowledge in free space propagation of other single photon experiments. In the first experiment, I study the spatial correlations of the daughter photons created in spontaneous parametric down conversion. I look at the effect of altering the pump beam on the positions of the down converted photons and see if the pump can be manipulated in a way to control the directions of the daughter photons. I begin to utilize a deformable mirror and Shack-Hartmann wavefront sensor which are generally used in adaptive optics, but we plan to use them to alter the pump beam in the spontaneous parametric down conversion process to analyze the correlations between the pump and down converted photons. The second experiment investigates the effects of laser scintillation on the performance of a possible tracking device that could be implemented on a satellite. This quad sensor tracks the position of a beam and a system will be developed to move the sensor to keep the beam in the center where there is a hole for the quantum single photons to stream through. In order to create the effects of scintillation, a turbulence simulator box was built and characterized. This box combines wind turbulence with a heat gradient to mimic atmospheric turbulence on a small scale. Finally, my contributions to a large scale, long distance free space quantum optics experiment are explained and the overall goal of the experiment is discussed. This experiment exposed me to actual free space transmission issues as well as many fundamental techniques for performing long distance optics experiments. In this experiment there was no correction for atmospheric turbulence, but in the future, techniques could be implemented which might increase the efficiencies of the free space links.

Experimental Study of Laser Propagation Through the Atmospheric Turbulence

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ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Experimental Study of Laser Propagation Through the Atmospheric Turbulence by : Kirk Alan Lohnes

Download or read book Experimental Study of Laser Propagation Through the Atmospheric Turbulence written by Kirk Alan Lohnes and published by . This book was released on 1980 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Propagation Tests Study

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ISBN 13 :
Total Pages : 297 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Optical Propagation Tests Study by :

Download or read book Optical Propagation Tests Study written by and published by . This book was released on 1972 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Optical Propagation Tests Study has analyzed the effects of atmospheric turbulence on atmospheric laser links. Analyses have found that scintillation (beam breakup), beam spread and beam wander will preclude operation of a high data rate uplink at 1 Gbps with an average P sub E of 0. 000001 unless special techniques are utilized in the ground transmitter design. It is predicted that focusing the beam at or above the tropopause will reduce the scintillation effects sufficiently, and pointing the uplink beam along the instantaneous normal to a downlink wavefront of a beam which originates at the satellite transmitter (reciprocity tracking) will remove most of the wander effects. A number of possible experimental techniques, suitable for testing these predictions have been explored. The recommendation is to perform an experiment in May/June 1974 using a variable focus reciprocity tracking ground transceiver and a balloon-borne (altitude 100,000 feet) system that is a modification of that developed in the Balloon Atmospheric Propagation Experiment. This recommendation allows for full utilization of the techniques (and equipment) developed under the 405B Acquisition/Tracking Brassboard programs and will specify the design constraints for the ground station by June 30, 1974.

Understanding the Effect of Atmospheric Turbulence on Optical and Infrared Propagation Using Hilbert Phase Analysis

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (64 download)

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Book Synopsis Understanding the Effect of Atmospheric Turbulence on Optical and Infrared Propagation Using Hilbert Phase Analysis by :

Download or read book Understanding the Effect of Atmospheric Turbulence on Optical and Infrared Propagation Using Hilbert Phase Analysis written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The refractive index structure parameter C(2/n) is a figure of merit used to describe the magnitude of the effect of turbulence in the atmosphere. Understanding the influence of different local climate parameters upon C(2/n) is an important step toward developing a prediction model for in-field laser interrogators. The layered structure of the atmosphere and its random behavior present unique challenges to theoretical and experimental studies in propagation research. This article presents a novel technique termed Hilbert Phase Analysis (HPA) to provide insights into the physical interactions. We explore the technique's use in analyzing the dependence of C(2/n) on local climate variables using data recently obtained from campaigns conducted in Puerto Rico.

Optical Waves and Laser Beams in the Irregular Atmosphere

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Publisher : CRC Press
ISBN 13 : 1351402676
Total Pages : 314 pages
Book Rating : 4.3/5 (514 download)

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Book Synopsis Optical Waves and Laser Beams in the Irregular Atmosphere by : Nathan Blaunstein

Download or read book Optical Waves and Laser Beams in the Irregular Atmosphere written by Nathan Blaunstein and published by CRC Press. This book was released on 2017-09-22 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces optical wave propagation in the irregular turbulent atmosphere and the relations to laser beam and LIDAR applications for both optical communication and imaging. It examines atmosphere fundamentals, structure, and content. It explains specific situations occurring in the irregular atmosphere and for specific natural phenomena that affect optical ray and laser beam propagation. It emphasizes how to use LIDAR to investigate atmospheric phenomena and predict primary parameters of the irregular turbulent atmosphere and suggests what kinds of optical devices to operate in different atmospheric situations to minimize the deleterious effects of natural atmospheric phenomena.

Investigation of Outer Length Scale In Optical Turbulence

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ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (742 download)

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Book Synopsis Investigation of Outer Length Scale In Optical Turbulence by :

Download or read book Investigation of Outer Length Scale In Optical Turbulence written by and published by . This book was released on 2003 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric turbulence degrades the electromagnetic propagation medium and affects many military applications. The strength and spatial distribution of turbulence are critical parameters that arise in theoretical modeling and experimental situations. This thesis investigated three outer scales of turbulence using experimental data from two instruments: microthermal probes carried by a balloon and an acoustic sounder. The outer length scale is the size of the largest energy-containing eddy in a turbulent region of the atmosphere. The length scales considered were the thermal length scale 1m associated with temperature fluctuations, the momentum length scale 1m which represents the size of the velocity fluctuations and the boundary thermal convective cell size. The microthermal balloon data had excessive scatter when the thermal outer scale was expressed in terms of the gradient Richardson number.

Experimental Investigations of the Energy Spectrum of Atmospheric Turbulence

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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Experimental Investigations of the Energy Spectrum of Atmospheric Turbulence by : G. N. Shur

Download or read book Experimental Investigations of the Energy Spectrum of Atmospheric Turbulence written by G. N. Shur and published by . This book was released on 1964 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

NASA Technical Report

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ISBN 13 :
Total Pages : 1054 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis NASA Technical Report by :

Download or read book NASA Technical Report written by and published by . This book was released on 1971 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Measurement of Optical Angular Deviation Caused by Atmospheric Turbulence and Refraction

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ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Experimental Measurement of Optical Angular Deviation Caused by Atmospheric Turbulence and Refraction by : James L. Hayes

Download or read book Experimental Measurement of Optical Angular Deviation Caused by Atmospheric Turbulence and Refraction written by James L. Hayes and published by . This book was released on 1966 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Turbulence Forecasting

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ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Optical Turbulence Forecasting by : Edmond M. Dewan

Download or read book Optical Turbulence Forecasting written by Edmond M. Dewan and published by . This book was released on 1980 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a tutorial on the effects of atmospheric turbulence upon systems which rely upon the propagation of LASER beams. In addition to providing a simplified presentation of turbulence theory and optical effects, it describes the state of the art of the new technique of radiosonde estimation of index of refraction fluctuations. Suggestions are given for future research which will help to answer current Air Force needs. The feasibility of some laser systems will depend upon the value of r0, the coherence length (which is related to “C2n” which in turn is related to the degree of turbulence). At present, the statistics of “r0” are inadequate.

Advances In Wave Turbulence

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Publisher : World Scientific
ISBN 13 : 9814520802
Total Pages : 294 pages
Book Rating : 4.8/5 (145 download)

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Book Synopsis Advances In Wave Turbulence by : Victor Shrira

Download or read book Advances In Wave Turbulence written by Victor Shrira and published by World Scientific. This book was released on 2013-05-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wave or weak turbulence is a branch of science concerned with the evolution of random wave fields of all kinds and on all scales, from waves in galaxies to capillary waves on water surface, from waves in nonlinear optics to quantum fluids. In spite of the enormous diversity of wave fields in nature, there is a common conceptual and mathematical core which allows to describe the processes of random wave interactions within the same conceptual paradigm, and in the same language. The development of this core and its links with the applications is the essence of wave turbulence science (WT) which is an established integral part of nonlinear science.The book comprising seven reviews aims at discussing new challenges in WT and perspectives of its development. A special emphasis is made upon the links between the theory and experiment. Each of the reviews is devoted to a particular field of application (there is no overlap), or a novel approach or idea. The reviews cover a variety of applications of WT, including water waves, optical fibers, WT experiments on a metal plate and observations of astrophysical WT.

Laboratory Simulation of Atmospheric Turbulence For Optical Propagation Studies

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ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Laboratory Simulation of Atmospheric Turbulence For Optical Propagation Studies by : L. R. Bissonnette

Download or read book Laboratory Simulation of Atmospheric Turbulence For Optical Propagation Studies written by L. R. Bissonnette and published by . This book was released on 1977 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurate simulation, on a laboratory scale, of atmospherically induced scintillation phenomena is achieved by creating an unstable vertical temperature gradient in a 1.5-m long, 40-cm wide and 60-cm deep tank filled with water. The turbulent index of refraction has a statistical structure similar to that of the atmosphere; in particular, the Kolmogoro's inertial subrange model is verified. The turbulent irradiance data in the simulation medium have the same features respecting power spectrum, saturation and supersaturation and obey the same theoretical scaling law as in the atmosphere. Typically, the characteristic propagation distances are reduced by a factor of 300 to 400. (Author).

Scientific and Technical Aerospace Reports

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ISBN 13 :
Total Pages : 440 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Atmospheric Propagation of Electromagnetic Waves II

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Publisher : Society of Photo Optical
ISBN 13 : 9780819470539
Total Pages : 122 pages
Book Rating : 4.4/5 (75 download)

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Book Synopsis Atmospheric Propagation of Electromagnetic Waves II by : Olga Korotkova

Download or read book Atmospheric Propagation of Electromagnetic Waves II written by Olga Korotkova and published by Society of Photo Optical. This book was released on 2008 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Proceedings Vol. 7821