Abstract: Holographic interferometry has emerged as a significantoptical imaging tool in supplementing conventionalautomotive powertrain testing methods in the areas ofnoise, vibration, and durability. This paper focuses onvarious techniques and applications in measuringinherent structural static and dynamic properties aswell as overall noise and vibration characteristics ofcomponents, subsystems, and complete powertrainsystems. Within the scope of continuous wave and pulsedinterferometry methods for imaging, the areas ofdisplay and quantification are discussed. Reflectionmode holograms obtained directly as well as generationfrom transmission holograms are illustrated.Measurement of modulated fringe phase in conjunctionwith an image processor for three dimensional surfacecontours is described. Also addressed are removal ofrigid body carrier fringes by sandwiched techniques.Reflection mode interferometric results are compared toclassical two beam transmission interferograms forimage quality, fringe characteristics and generaltechnical advantages and drawbacks of each method ofdisplay. !8
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