Author: Mazen S. NairatPublisher:
ISBN:
Category : Laser beams
Languages : en
Pages : 188
Book Description
Characterization of the Performance of a Laser Imaging System Through the Atmosphere
Author: Mazen S. NairatPublisher:
ISBN:
Category : Laser beams
Languages : en
Pages : 188
Book Description
Performance of Imaging Laser Radar in Rain and Fog
Author: Kathleen M. CampbellPublisher:
ISBN: 9781423564966
Category : Fog
Languages : en
Pages : 113
Book Description
The Air Force is currently developing imaging laser radar systems (ladar) for use on precision guided munitions and other imaging systems. Scientists at Eglin Air Force Base, in conjunction with Wright Laboratories, are testing a 1.06-um wavelength ladar system and need to understand the weather effects on the ladar images. As the laser beam propagates through the atmosphere, fog droplets and raindrops can cause image degradation, and these image degradations are manifested as either dropouts or false returns. An analysis of the dropouts and false returns helped to quantify the performance of the system in adverse weather conditions. Statistical analysis of the images showed non-linear relationships existed between variables, plus graphical analysis demonstrated the behavior of the dropouts and false returns with changing weather conditions. Statistical control charts identified the weather as a significant influence on the quality of the ladar images. By focusing on the false return data, a study of mean free path and the survival equation was accomplished. The mean free path was derived from the rainfall rate, and this mean free path was used in the survival equation to calculate an expected number of false returns for an image. This work led to the hypothesis that raindrops with a diameter of 3.0 mm and larger were causing the false returns seen in the images. However, further analysis revealed that a 3.0-mm raindrop was not capable of scattering enough energy to be detected by the system. It was then hypothesized that the system detector was also picking up solar spectrum energy scattered by raindrops, and that this detector was unable to distinguish between solar energy and laser energy scattered by raindrops.
Masters Theses in the Pure and Applied Sciences
Author: Wade ShaferPublisher: Springer Science & Business Media
ISBN: 1461337003
Category : Science
Languages : en
Pages : 335
Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Scientific and Technical Aerospace Reports
Author: Research on Characterization of the Upper Atmosphere Using Lidar
Author: Michael BurkaPublisher:
ISBN:
Category : Atmosphere, Upper
Languages : en
Pages : 9
Book Description
Artificial Turbulence for Imaging and Wave Propagation
Author: John D. GonglewskiPublisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Science
Languages : en
Pages : 196
Book Description
Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Earth Resources
Author: Publisher:
ISBN:
Category : Astronautics in earth sciences
Languages : en
Pages : 758
Book Description
Photonics Spectra
Author: The Office of Environmental Management Technical Reports
Author: Publisher:
ISBN:
Category : Environmental management
Languages : en
Pages : 972
Book Description
Ocean Optics
Author: Publisher:
ISBN:
Category : Optical oceanography
Languages : en
Pages : 456
Book Description