Heterodyne measurements of atmospheric phase turbulence at 6328A.
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civil...
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| Language: | en_US |
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Massachusetts Institute of Technology
2012
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| Online Access: | http://hdl.handle.net/10945/12284 |
| Summary: | This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title. === This thesis investigates the effects of atmospheric
turbulence on the spatial properties of the phase of transmitted
beams. Experimental measurements in the form of a series of
photographs of interference patterns between two beams were
made using a modified optical heterodyne system. The two beams
of the heterodyne system were mixed with a very small, controllable
angular difference between their directions of approach to
the detector. The resulting fringe patterns were effected by the
atmosphere as differences between succeeding photographs show.
The first order effect of the atmosphere was found to be a tilt
relative to the direction of travel. Tilt differences as small as
5 seconds of arc can be measured using this system with assurance;
smaller values could be confused with systematic effects. |
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