Signal Processing for Shearing Interferometer Measurements.

reportActive / Technical Report | Accession Number: ADA064043 | Open PDF

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

Author(s):
Martone, Patrick J.
Author Organization(s):
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
Descriptive Note:
Master's thesis,
Pagination:
0061

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFIT/GEO/EE/78-2
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.3.2_Personnel Management; JCA_4.6_Engineering
Modernization Areas:
Directed Energy
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*SIGNAL PROCESSING, *ATMOSPHERIC DISTURBANCES, *OPTICAL INTERFEROMETERS, *PHASE MEASUREMENT, SIGNAL TO NOISE RATIO, THESES, FAR FIELD, FEEDBACK, PHASE LOCKED SYSTEMS, TRACKING TELESCOPES
Field(s)/Group(s):
Atmospheric Physics, Cybernetics, Optical Detection and Detectors
Keyword(s):
Shearing interferometers, Optical phase processing, Phase demodulators, Synchronous detectors, Deformable mirrors
Report Date:
1978 Dec 01