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Holographic Interferometry Technology and Methods
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Technology and Techniques are mature and well understood
HI is full-field, non-contact, nondestructive, and real-time
Structural, Thermal, or vibration analysis performed with
very low amplitude or stress excitation
Identifies displacements, modal geometries, structural dynamics,
and induced stress
Holographic Methods Include:
Real-Time -- Generates fringe-patterns by super-imposing the hologram of stable (undistrurbed) object over the actual object as it is subjected to some stress in real time.
Time-average -- Genrates fringe patterns in hologram created while object is subjected to periodic displacement (vibration)
Multi-exposure -- generates "before and after stress" displacement fringe pattern
Techniques map geometry and magnitude of displacements
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