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Experimental approach toward holographic interferometric fringe interpretationCurrent literature concerning the measurement of small displacements by the laser holographic technique was reviewed. It was found that existing theories are extremely difficult, if not impossible, to apply to any realistic nondestructive testing conditions in which the geometries of the objects are complex and the three-dimensional displacements are irregular. An experimental approach was adopted for interpreting correlation between real time holographic fringe patterns and small displacements. Preliminary results show that the present method is feasible for the quantitative interpretation of the fringes as well as the calibration of the mobile HNDT system.
Document ID
19750011560
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Liu, H. K. (Alabama Univ. University, AL, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1974
Subject Category
Instrumentation And Photography
Report/Patent Number
BER-175-74
NASA-CR-120707
Accession Number
75N19632
Funding Number(s)
CONTRACT_GRANT: NAS8-30479
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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