Some investigations in holographic microscopic interferometry with respect to the estimation of stress and strain in micro-opto-electro-mechanical systems (MOEMS)
Article Ecrit par: Kruschke, Oliver ; Demoli, Nazif ; Gruber, Hartmut ; Kruger, Sven ; Wernicke, Gunther ; Bouamama, Larbi ;
Résumé: Holographic microscopy with conjugate reconstruction for the interferometric determination of three-dimensional displacement was used for the investigation of the mechanical behaviour of micromechanic and microelectronic components. An experimental set-up for the exposure of the holographic interferograms is described for the application of the spatial heterodyne technique, for the application of phase shifting, and for electro-optic holography. Three holograms for different illumination directions recorded on one holographic plate were reconstructed conjugately, and spatial-heterodyne technique as well as phase-shift technique were used to evaluate the interferograms. Only by conjugated reconstruction, it is possible to obtain a perfectly optimised interferometer for the static evaluation method. The evaluation of interferograms, which are strongly disturbed by speckle noise, can be performed successfully. A comparison of the results of the application of these techniques is given. The influence of the speckle effect on the resolution was investigated.
Langue:
Anglais
Index décimal
621.382 24 .Bruit, interférence, parasites (bruit, interférence, parasites électroniques)
Thème
Electronique
Mots clés:
Bruit
Etude expérimentale
Detection heterodyne
Interférométrie par granularité
