A Technique for Estimating the Strength of Turbulence and Inner Scale along an Optical Propagation Path

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$749,966.00
Award Year:
2007
Program:
SBIR
Phase:
Phase II
Contract:
FA9451-07-C-0032
Award Id:
78796
Agency Tracking Number:
F061-009-2005
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
1341 South Sunkist Street, Anaheim, CA, 92806
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
801256199
Principal Investigator:
TerryBrennan
Senior Scientist
(714) 772-7668
tbrennan@tosc.com
Business Contact:
GlennTyler
President
(714) 772-7668
glenn.a.tyler@tosc.com
Research Institute:
n/a
Abstract
Knowledge of key parameters of optical turbulence is essential for prediction of optical performance in both imaging and transmitting applications. Optimal techniques for compensation of turbulence effects are only as good as the knowledge of the turbulence environment. The basic required parameters are r0, the Fried coherence length, and fG, the Greenwood frequency. These are specifications of the mean spatial and temporal statistics of the turbulence. Generally, these parameters plus the Kolmogorov spectrum are utilized for analysis and simulation of optical propagation through turbulence. It is recognized that the Hill spectrum, including inner scale, L0, is a more realistic model of index variations. This model includes a turbulence enhancement in a spectral subrange prior to the inner scale roll-off. Knowledge of this enhancement and the subsequent roll-off is important for predicting the statistics of both phase and scintillation effects and has a direct impact on adaptive optics design and performance. A technique, and sensor design, is proposed that is capable of estimating r0, fG, and L0 as well as scintillation statistics. The technique has been demonstrated in analysis and simulation. A prototype sensor will be built and the technique will be demonstrated in a range of turbulence environments.

* information listed above is at the time of submission.

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