Accession Number:

ADA064043

Title:

Signal Processing for Shearing Interferometer Measurements.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1978-12-01

Pagination or Media Count:

61.0

Abstract:

This paper provides a basic description of the operation of a shearing interferometer used for phasefront sensing. The signal processing of the interferometers outputs are studied. A basic demodulation scheme and a phaselocked loop configuration are discussed and compared. Some elementary phaselocked loop theory is provided. A possible configuration using optical feedback for determining off-axis tilt of a plane is presented. The signal-to-noise ratio of the shearing interferometers outputs is improved by a slight modification of the optical configuration. Finally, a geometric representation of a distorted phase profile is provided which will describe the deleterious effects of a planar phasefront propagating through the turbulent atmosphere. Author

Subject Categories:

  • Atmospheric Physics
  • Cybernetics
  • Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE