A technique for obtaining improved real-time holographic interferometric data using pulse modulated illumination

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088 ⊔ ⊔ ‡aAD 0723632
088 ⊔ ⊔ ‡aAFFDL TR 70-173
100 1 ⊔ ‡aAdams, Frank D., ‡eauthor.
245 1 2 ‡aA technique for obtaining improved real-time holographic interferometric data using pulse modulated illumination / ‡cFrank D. Adams, Gene E. Maddux.
264 ⊔ 1 ‡aWright-Patterson Air Force Base, Ohio : ‡bAir Force Flight Dynamics Laboratory, Structural Analysis Group, Structures Division, Air Force Systems Command, United States Air Force, ‡c1971.
300 ⊔ ⊔ ‡avii, 58 pages : ‡billustrations, figures ; ‡c28 cm.
336 ⊔ ⊔ ‡atext ‡btxt ‡2rdacontent
337 ⊔ ⊔ ‡aunmediated ‡bn ‡2rdamedia
338 ⊔ ⊔ ‡avolume ‡bnc ‡2rdacarrier
490 0 ⊔ ‡aAir Force Flight Dynamics Laboratory (U.S.). Technical report ; ‡vAFFDLTR 70-173
500 ⊔ ⊔ ‡aResearch supported by the Air Force Flight Dynamics Laboratory, Air Force Systems Command, United States Air Force.
500 ⊔ ⊔ ‡a"This report is the result of an in-house effort under Project 1467, Task 146702.
500 ⊔ ⊔ ‡a"March 1971."
504 ⊔ ⊔ ‡aIncludes bibliographical references (page 58).
520 ⊔ ⊔ ‡aCalculations 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.
538 ⊔ ⊔ ‡aMode of access: Internet.
583 1 ⊔ ‡awill digitize ‡c20200923 ‡zQueued for digitization ‡cSeptember 23, 2020 ‡5miu ‡2pda
650 ⊔ 0 ‡aThermal stresses.
650 ⊔ 0 ‡aBuckling (Mechanics)
650 ⊔ 0 ‡aMetals ‡xCracking.
650 ⊔ 0 ‡aAirframes.
650 ⊔ 0 ‡aLasers.
650 ⊔ 0 ‡aNondestructive testing.
650 ⊔ 0 ‡aPhotography, Stereoscopic.
700 1 ⊔ ‡aMaddux, Gene E., ‡eauthor.
710 2 ⊔ ‡aAir Force Flight Dynamics Laboratory (U.S.), ‡eissuing agency.
730 0 ⊔ ‡aTechnical Report Archive & Image Library (TRAIL)
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