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Aero-optic characteristics of turbul...

Wyckham, Christopher Mark.

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Aero-optic characteristics of turbulent compressible boundary layers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Aero-optic characteristics of turbulent compressible boundary layers./
Author:	Wyckham, Christopher Mark.
Description:	203 p.
Notes:	Adviser: Alexander J. Smits.
Contained By:	Dissertation Abstracts International67-01B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3206551
ISBN:	9780542529887

Aero-optic characteristics of turbulent compressible boundary layers.
Wyckham, Christopher Mark.

Aero-optic characteristics of turbulent compressible boundary layers. - 203 p.

Adviser: Alexander J. Smits.

Thesis (Ph.D.)--Princeton University, 2006.

This dissertation presents a detailed study of the aberrating effect on a plane incident wavefront of light due to its passage through a turbulent, compressible boundary layer. This aberration has important implications for the design of airborne optical systems for imaging, communications, or projection.

ISBN: 9780542529887Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Aero-optic characteristics of turbulent compressible boundary layers.
LDR:03225nam 2200361 a 45 001 969368
005 20110920
008 110921s2006 eng d
020 $a 9780542529887
035 $a (UMI)AAI3206551
035 $a AAI3206551
040 $a UMI $c UMI
100 1 $a Wyckham, Christopher Mark. $3 1293421
245 1 0 $a Aero-optic characteristics of turbulent compressible boundary layers.
300 $a 203 p.
500 $a Adviser: Alexander J. Smits.
500 $a Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0376.
502 $a Thesis (Ph.D.)--Princeton University, 2006.
520 $a This dissertation presents a detailed study of the aberrating effect on a plane incident wavefront of light due to its passage through a turbulent, compressible boundary layer. This aberration has important implications for the design of airborne optical systems for imaging, communications, or projection.
520 $a A Shack-Hartmann sensor and associated data analysis software suite were developed and validated for the high resolution measurement of two dimensional wavefront phase. Significant improvements in wavefront reconstruction were achieved by using the calculated centroid uncertainties to weight the least squares fitting of the phase surface.
520 $a Using the Shack-Hartmann sensor in a high speed, one dimensional mode, individual structures are observed propagating past the sensor in a transonic flow. The uncertainties on the reconstructed phase in this mode are very high, however. In a two dimensional mode the uncertainties are greatly reduced and a large database of individual, uncorrelated wavefronts was collected, allowing statistics to be calculated such as the rms wavefront height and the Strehl ratio.
520 $a Data were collected at transonic and hypersonic speeds and with no injection or with helium or nitrogen injection into the boundary layer. In all cases except the hypersonic helium injection case, the time averaged wavefronts reveal no features in the boundary layer which are steady in time. In the hypersonic helium injection case, however, steady, longitudinal features are observed, in agreement with previous observations.
520 $a When helium is injected for window cooling at high speeds, the results show there may be an opportunity to reduce the resulting distortion by taking advantage of the stable structures that form in the boundary layer by using a low bandwidth adaptive optic system.
520 $a A new scaling argument is also presented to allow the prediction and comparison of wavefront data for different compressible boundary layer flow conditions. The proposed formula gives promising results over a very wide range of Mach numbers and conditions when used to compare the current work as well as previous work by others, and may prove to be a crucial tool in the study of boundary layer aero-optic behavior.
590 $a School code: 0181.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Optics. $3 1018756
690 $a 0538
690 $a 0548
690 $a 0752
690 $a 0759
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 67-01B.
790 $a 0181
790 1 0 $a Smits, Alexander J., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3206551