Dynamic coherence scanning interferometry based on an optical phase mask for simultaneous measurement of local induced vibration and local topology change of a mirror
General Engineering; Atomic and Molecular Physics, and Optics; Interferometry; Einstein Telescope; Coherence Scanning Interferometry; Dynamic Interferometry
Abstract :
[en] We describe the state of the development of a coherence scanning interferometer to measure local changes in topology and local induced vibrations of a mirror at cryogenic temperatures. The metrology instrument incorporates an optical phase mask and a microlenses array, enabling the acquisition of complete white light interferograms within a single-camera frame. This stands in contrast to traditional temporal phase-shifting interferometers. We design the optical phase mask as a combination of steps of different thicknesses, so each step introduces a different optical path difference to the rays. The local interferograms for each camera frame provide us with information on the local topology of the mirror. The interferogram displacement between camera frames allows us to monitor the mirror’s local induced vibrations. In this work, we report the metrology instrument’s working principle through numerical simulations and present the latest results of a proof of concept developed at the laboratory. The metrology instrument shown is of extensive usability in diverse applications related to real-time measurements of various fast physical processes and real-time characterization of the optical components topology.
Research center :
CSL - Centre Spatial de Liège - ULiège [BE]
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Vilaboa Perez, Jesus ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Georges, Marc ; Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Hastanin, Juriy ; Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Loicq, Jerôme ; Université de Liège - ULiège > Centres généraux > CSL (Centre Spatial de Liège)
Language :
English
Title :
Dynamic coherence scanning interferometry based on an optical phase mask for simultaneous measurement of local induced vibration and local topology change of a mirror
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