Title page for ETD etd-110398-161755


Type of Document Master's Thesis
Author Coffey, Katherine Leigh
URN etd-110398-161755
Title Next-Generation Earth Radiation Budget Instrument Concepts
Degree Master of Engineering
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Mahan, James Robert Committee Chair
Priestley, Kory J. Committee Member
Stern, Curtis H. Committee Member
Keywords
  • PERSEPHONE
  • CERES
  • Monte-Carlo ray-trace
  • diffraction
Date of Defense 1998-11-30
Availability unrestricted
Abstract
The current effort addresses two issues important to the research conducted by the Thermal Radiation Group at Virginia Tech. The first research topic involves the development of a method which can properly model the diffraction of radiation as it enters an instrument aperture. The second topic involves the study of a potential next-generation space-borne radiometric instrument concept.

Presented are multiple modeling efforts to describe the diffraction of monochromatic radiant energy passing through an aperture for use in the Monte-Carlo ray-trace environment. Described in detail is a deterministic model based upon Heisenberg's uncertainty principle and the particle theory of light. This method is applicable to either Fraunhofer or Fresnel diffraction situations, but is incapable of predicting the secondary fringes in a diffraction pattern. Also presented is a second diffraction model, based on the Huygens-Fresnel principle with a correcting obliquity factor. This model is useful for predicting Fraunhofer diffraction, and can predict the secondary fringes because it keeps track of phase.

NASA is planning for the next-generation of instruments to follow CERES (Clouds and the Earth's Radiant Energy System), an instrument which measures components of the Earth's radiant energy budget in three spectral bands. A potential next-generation concept involves modification of the current CERES instrument to measure in a larger number of wavelength bands. This increased spectral partitioning would be achieved by the addition of filters and detectors to the current CERES geometry. The capacity of the CERES telescope to serve for this purpose is addressed in this thesis.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  AppendA.pdf 30.66 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01
  AppendB.pdf 8.43 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  AppendC.pdf 27.07 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01
  Ch1.pdf 13.74 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  Ch2.pdf 26.81 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01
  Ch3.pdf 81.22 Kb 00:00:22 00:00:11 00:00:10 00:00:05 < 00:00:01
  Ch4.pdf 1.90 Mb 00:08:48 00:04:31 00:03:57 00:01:58 00:00:10
  Ch5.pdf 3.32 Mb 00:15:21 00:07:54 00:06:54 00:03:27 00:00:17
  ch6.pdf 10.57 Kb 00:00:02 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  etd.pdf 21.41 Kb 00:00:05 00:00:03 00:00:02 00:00:01 < 00:00:01
  References.pdf 17.06 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01
  vita.pdf 4.39 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.