Digital holographic tomography for path-resolved turbulence measurements

Anthony Klee; Samuel T. Thurman; Thomas Alley

doi:10.1117/12.2594645

1 August 2021 Digital holographic tomography for path-resolved turbulence measurements

Anthony Klee, Samuel T. Thurman, Thomas Alley

Proceedings Volume 11836, Unconventional Imaging and Adaptive Optics 2021; 118360F (2021) https://doi.org/10.1117/12.2594645
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We present a new technique combining digital holography and tomography to make path-resolved measurements of a turbulent air volume. An array of optical beams at different propagation angles is transmitted through the volume under test, interfered with a reference beam, and the resulting fringe patterns are all simultaneously recorded on a focal plane array. The complex field of each beam in the receiver pupil plane is recovered via digital Fourier processing and then tomographic reconstruction algorithms are applied to calculate wavefront error contributions from multiple planes along the beam path. Results are presented from a proof-of-concept laboratory experiment using phase screens to mimic the turbulence volume. Comparing the tomographic reconstructions to the known screen prescriptions, we successfully demonstrate accurate measurement of the phase distortions introduced in multiple planes. This ability to longitudinally resolve turbulence and isolate individual layers may benefit numerous applications including precision turbulent flow analysis in wind tunnels and adaptive optic compensation for free space optical communications.

Conference Presentation

Citation Download Citation

Anthony Klee, Samuel T. Thurman, and Thomas Alley "Digital holographic tomography for path-resolved turbulence measurements", Proc. SPIE 11836, Unconventional Imaging and Adaptive Optics 2021, 118360F (1 August 2021); https://doi.org/10.1117/12.2594645

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