2012

Sampling and Reconstruction of the Pupil and Electric Field for Phase Retrieval

This technology is based on sampling considerations for a band-limited function, which has application to optical estimation generally, and to phase retrieval specifically. The analysis begins with the observation that the Fourier transform of an optical aperture function (pupil) can be implemented with minimal aliasing for Q values down to Q = 1. The sampling ratio, Q, is defined as the ratio of the sampling frequency to the band-limited cut-off frequency. The analytical results are given using a 1-d aperture function, and with the electric field defined by the band-limited sinc(x) function. Perfect reconstruction of the Fourier transform (electric field) is derived using the Whittaker-Shannon sampling theorem for 1

The Fourier transform is constructed by periodic extension, i.e., by spacing copies of the transform in a definite way, recognizing that no aliasing occurs for values of the sampling ratio such that 1

This work was done by Bruce Dean, Jeffrey Smith, and David Aronstein of Goddard Space Flight Center. GSC-15947-1

White Papers

Integrated Epoxy Feedthroughs Improve Fuel Pump Reliability
Sponsored by Douglas Electrical Components
Introduction to Machine Vision
Sponsored by Cognex
Critical Techniques for High-Speed A/D Converters in Real-Time Systems
Sponsored by Pentek
Protecting the Sky
Sponsored by Rohde and Schwarz AD
Hermetic Feedthroughs Safeguard Mission-Critical Electronics
Sponsored by Douglas Electrical Components
DryLin® E7 plastic linear plain bearings versus PTFE-lined plain bearings
Sponsored by igus

White Papers Sponsored By:

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.