Share Email Print
cover

Optical Engineering

Sensing three-dimensional index-of-refraction variations by means of optical wavefront sensor measurements and tomographic reconstruction
Author(s): Michael C. Roggemann; Byron M. Welsh; Patrick J. Gardner; Robert L. Johnson; Byron L. Pedersen
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper Abstract

Light waves propagating through a region of inhomogeneous index of refraction are aberrated. Turbulent air flows cause such inhomogeneities to arise from density fluctuations within the flow, which affect the index of refraction of air. Here we describe a technique for measuring the 3-D structure of the index-of-refraction distribution in a turbulent air flow using optical wavefront sensor measurements and tomographic signal reconstruction. Use of wavefront sensor measurements offers higherspeed measurement than previously used holographic methods, while providing high-fidelity reconstructions. We discuss Hartmann sensor measurements and wavefront reconstruction. Sampling requirements are also addressed, including the effects of a limited number of projections and wavefront subaperture size. Theory, simulation, and experimental results are presented.

Paper Details

Date Published: 1 May 1995
PDF: 11 pages
Opt. Eng. 34(5) doi: 10.1117/12.199870
Published in: Optical Engineering Volume 34, Issue 5
Show Author Affiliations
Michael C. Roggemann, Air Force Institute of Technology (United States)
Byron M. Welsh, Air Force Institute of Technology (United States)
Patrick J. Gardner, Air Force Institute of Technology (United States)
Robert L. Johnson, Air Force Institute of Technology (United States)
Byron L. Pedersen, Air Force Institute of Technology (United States)


© SPIE. Terms of Use
Back to Top