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UID:0-536@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150325T163000

DTEND;TZID=Asia/Jerusalem:20150325T173000

DTSTAMP:20230603T193555Z

URL:https://aerospace.technion.ac.il/events/the-aero-optic-phenomenon-in-a
 -compressible-shear-layer/

SUMMARY:The Aero-Optic Phenomenon in a Compressible Shear Layer
DESCRIPTION:Lecturer:Yasmin Ribak\n Faculty:Department of Aerospace Enginee
 ring\n Institute:Technion – Israel Institute of Technology\n Location:Cl
 assroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract:
  \n Details: \n The aero-optic effect is a major topic of interest due to 
 its relevance in various applications\, which involve interactions between
  propagated laser beams and an inhomogeneous medium (such as the variable-
 density flow fields\, which form within compressible boundary and free she
 ar layers). By creating aero-optical aberrations\, this phenomena results 
 in significant reduction of optical system performance and yield lower pea
 k energy of the light intensity and wider energy distribution around the c
 entral spot of the beam. The broad range of industrial applications\, wher
 e such an effect is observed\, includes missiles with optical seekers\, ai
 rborne telescopes\, airborne free-space communication systems\, and high-
 powered lasers on combat air vehicles.\nIn the present research\, quantita
 tive and qualitative methods are devised in order to characterize the aero
 -optic effect in the mixing layers of a compressible free jet. Towards vis
 ualization of the mixing layer between the ambient and the free jet\, two 
 optical measurement techniques (Shadowgraph and Schlieren) are used in a q
 ualitative manner. The intensity of the laser\, along with its distributio
 n\, is evaluated and the deviations of the initially collimated beam are a
 nalysed. Enhanced understanding of the laser beam distortions associated w
 ith a compressible jet contributes to the pool of efforts towards developi
 ng an optimal technique which can form an undistorted wave front.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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