The Resource Phase distortion due to airflow over a hemispherical laser turret, by A.E. Fuhs and S.E. Fuhs

Phase distortion due to airflow over a hemispherical laser turret, by A.E. Fuhs and S.E. Fuhs

Label
Phase distortion due to airflow over a hemispherical laser turret
Title
Phase distortion due to airflow over a hemispherical laser turret
Statement of responsibility
by A.E. Fuhs and S.E. Fuhs
Creator
Contributor
Subject
Language
eng
Summary
Compressible flow over a laser turret creates a phase distortion. To gain insight to this problem a model of a hemispherical turret is developed. The flow field is obtained using a second order solution based on Janzen-Rayleigh expansion for the compressible potential flow equation. Contours of constant phase distortion were calculated; results at the critical Mach number are presented and discussed. It was found that the distortion at 0 degree elevation angle was equivalent to a positive lens whereas at 90 degrees the distortion is similar to a negative lens. At 45 degrees the main effect is beam tilting into the wind. For a ratio of beam radius to turret radius equal to 0.5, the focal length at beam elevation angle of 0 degrees is 16.5km. At beam elevation of 54 degrees the beam tilt was found to be 26.5 microradians. Cruise missiles with intercontinental ranges may use celestial navigation which requires precise measurement of angular location of stars. A distorted lens created by the ambient flow field causes an error in measurement. Knowledge of the external aerodynamics is important
Cataloging source
AD#
http://library.link/vocab/creatorName
Fuhs, Allen E
Government publication
federal national government publication
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • technical reports
http://library.link/vocab/relatedWorkOrContributorName
  • Huhs, Susan E
  • Naval Postgraduate School (U.S.)
http://library.link/vocab/subjectName
  • Aerodynamics
  • Lasers
  • Guided missiles
Type of report
Technical report; 1976.
Label
Phase distortion due to airflow over a hemispherical laser turret, by A.E. Fuhs and S.E. Fuhs
Link
https://archive.org/details/phasedistortiond00fuhs
Instantiates
Publication
Note
  • Title from cover
  • "September 1976"--Cover
  • "NPS-69FU76101"--Cover
Bibliography note
Includes bibliographical references (p. 31)
Color
black and white
Dimensions
unknown
Extent
1 online resource (35 pages
Form of item
online
Governing access note
"Approved for public release; distribution unlimited"--Cover
Other physical details
illustrations)
Specific material designation
remote
Label
Phase distortion due to airflow over a hemispherical laser turret, by A.E. Fuhs and S.E. Fuhs
Link
https://archive.org/details/phasedistortiond00fuhs
Publication
Note
  • Title from cover
  • "September 1976"--Cover
  • "NPS-69FU76101"--Cover
Bibliography note
Includes bibliographical references (p. 31)
Color
black and white
Dimensions
unknown
Extent
1 online resource (35 pages
Form of item
online
Governing access note
"Approved for public release; distribution unlimited"--Cover
Other physical details
illustrations)
Specific material designation
remote

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