A technique for obtaining improved real-time holographic interferometric data using pulse modulated illumination /
Frank D. Adams, Gene E. Maddux.

Description

Main Author

Adams, Frank D.

Related Names

Maddux, Gene E., author.
Air Force Flight Dynamics Laboratory (U.S.)

Language(s)

English

Published

Wright-Patterson Air Force Base, Ohio : Air Force Flight Dynamics Laboratory, Structural Analysis Group, Structures Division, Air Force Systems Command, United States Air Force, 1971.

Subjects

Thermal stresses.
Buckling (Mechanics)
Metals > Metals / Cracking.
Airframes.
Lasers.
Nondestructive testing.
Photography, Stereoscopic.

Summary

Calculations and experiments were performed to show that the fringe patterns on a vibrating structure, as observed using real-time holographic interferometry, has a substantially increased contrast ratio if the laser illumination is amplitude modulated by a sequence of pulses which are synchronized with the vibration. The time and effort required to obtain interferometric data using this method is an order of magnitude less than that needed when using time-average holographic interferograms. Potential applications include experimental studies of fatigue damage, crack detection and propagation, flaw detection in composite and honeycomb structures as well as vibration analysis of structural members.

Note

Research supported by the Air Force Flight Dynamics Laboratory, Air Force Systems Command, United States Air Force.
"This report is the result of an in-house effort under Project 1467, Task 146702.
"March 1971."

Physical Description

vii, 58 pages : illustrations, figures ; 28 cm.

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