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Generating Strictly Controlled Stimuli for Figure Recognition Experiments

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Aggregate behavior of branch points--persistent pairs.

Denis W Oesch¹, Darryl J Sanchez, Carolyn M Tewksbury-Christle

¹Science Applications International Corporation, Albuquerque, New Mexico, USA. denis.w.oesch@saic.com

|January 26, 2012

Summary

This summary is machine-generated.

Branch points in light waves, caused by atmospheric turbulence, can be tracked over time. This study extends previous findings by showing that persistent branch point pairs can also be identified, aiding in turbulence analysis.

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Area of Science:

* Optics and atmospheric physics.
* Wave propagation in turbulent media.

Background:

* Atmospheric turbulence induces spatial and temporal phase variations in light waves.
* These variations can create branch points (zero-amplitude positions) under strong turbulence.
* Previous research utilized persistent branch points to estimate atmospheric layer properties.

Purpose of the Study:

* To extend the concept of branch point persistence to include pairs of branch points.
* To develop and validate an algorithm for isolating persistent branch point pairs.
* To experimentally demonstrate the existence of persistent branch point pairs in atmospheric turbulence.

Main Methods:

* Development of an algorithm for isolating persistent branch point pairs.
* Experimental data collection under atmospheric turbulence conditions.
* Analysis of branch point behavior over time and through multiple turbulence layers.

Main Results:

* Persistent branch point pairs were successfully isolated using the developed algorithm.
* Experimental data confirmed the existence of these persistent pairs.
* Branch point pairs demonstrate persistence through time and additional turbulence layers.

Conclusions:

* Branch point pairs exhibit persistence, similar to single branch points.
* The developed algorithm effectively identifies these persistent pairs.
* Persistent branch point pairs offer a new tool for characterizing atmospheric turbulence.