Wavelet-based phase determination in optical turbulence

Katharine J. Jones

doi:10.1117/12.825357

12 August 2009 Wavelet-based phase determination in optical turbulence

Katharine J. Jones

Proceedings Volume 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III; 74630F (2009) https://doi.org/10.1117/12.825357
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Laser beam propagation in a marine environment is of critical importance in the different aspects of Target-in-the-Loop operations. Beam wander and beam spread have been found to be due to turbulence. Wavelet-based phase determination is presented here as a viable approach for analyzing turbulence which is a very significant beam degradation factor. This approach can provide higher beam resolution and significant performance enhancement for laser beam propagation in a marine environment. Wavelet-based phase distribution is particularly appropriate for marine environments which have large vertical gradients in turbulence and are difficult to simulate. First, the distorted beam is put though a shearing interferometer resulting in an interference pattern which is proportional to the gradient of the wavefront. One dimensional signals are taken through the two dimensional interferogram. The Morlet wavelet transform is taken of the one dimensional signal and plotted as a spectrogram. The phase of the signal is equal to the phase of the transform. The phase of the signal carries noise and can identify turbulence in real time. Turbulence is a very significant beam degradation factor which is generated by fluctuations in the index of refraction in a marine environment. Phase can be determined by wavelet-based phase determination, allowing better analysis of beam degradation and improved performance.

Citation Download Citation

Katharine J. Jones "Wavelet-based phase determination in optical turbulence", Proc. SPIE 7463, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation III, 74630F (12 August 2009); https://doi.org/10.1117/12.825357

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Turbulence

Laser beam propagation

Wavelets

Atmospheric propagation

Ocean optics

Wavelet transforms

Optical turbulence

Show All Keywords

Keywords/Phrases

Search In:

Publication Years