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Proceedings Paper

The Differential Phase Experiment: experimental concept, design analysis, and data reduction analysis
Author(s): Glenn A. Tyler; Terry J. Brennan; Stephen L. Browne; Robert H. Dueck; Michael S. Lodin; Phillip H. Roberts; Jeffrey L. Vaughn
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Paper Abstract

This paper describes the differential phase experiment (DPE) which formed a major part of the ABLE ACE suite of experiments conducted by the Air Force. The work described covers the rationale for the experiment, the basic experimental concept, the analysis of the differential phase, the optical and software design analysis, a discussion of the polarization scrambling characteristics of the optics, calibration of the equipment and a presentation of some of the major results of the data reduction effort to date. The DPE was a propagation experiment conducted between two aircraft flying at an altitude of 40,000 feet whose purpose was to measure the phase difference between two beams propagating at slightly different angels through the atmosphere. A four bin polarization interferometer was used to measure the differential phase. Due to the high level of scintillation that was presented branch points were present in the phase function. Rytov theory, wave optics simulation and the experimental measurements are in general agreement. Self consistency checks that were performed on the data indicate a high level of confidence in the results. Values of Cn2 that are consistent with the measurements of the differential phase agree with simultaneous scintillometer measurement taken long the same path in levels of turbulence where the scintillometer is not saturated. These differential phase based Cn2 estimates do not appear to saturate as is typical of scintillometer measurements and appear to extend the range over which high levels of Cn2 can be estimated. In addition the differential phase and anisoplanatic Strehl computed from the data is consistent with Rytov theory and wave optics simulations.

Paper Details

Date Published: 6 August 1997
PDF: 27 pages
Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); doi: 10.1117/12.281028
Show Author Affiliations
Glenn A. Tyler, the Optical Sciences Co. (United States)
Terry J. Brennan, the Optical Sciences Co. (United States)
Stephen L. Browne, Optical Sciences Co. (United States)
Robert H. Dueck, the Optical Sciences Co. (United States)
Michael S. Lodin, the Optical Sciences Co. (United States)
Phillip H. Roberts, the Optical Sciences Co. (United States)
Jeffrey L. Vaughn, the Optical Sciences Co. (United States)


Published in SPIE Proceedings Vol. 3065:
Laser Radar Technology and Applications II
Gary W. Kamerman, Editor(s)

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