Title
Performance and testing of a four channel high-resolution heterodyne interferometer Performance and testing of a four channel high-resolution heterodyne interferometer
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Barking ,
Subject
Physics
Human medicine
Source (journal)
Optics and lasers in engineering. - Barking
Volume/pages
47(2009) :3/4 , p. 488-494
ISSN
0143-8166
ISI
000264096500027
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
When studying complex vibrations, simultaneous measurements at several points are indispensable if one is dealing with objects whose vibrational behavior is not guaranteed to be stable over longer periods of time, such as biological specimens, micro-mechanical elements or objects characterized by nearly resonant normal modes with different vibrational patterns. Obviously, both amplitude and phase need to be measured at each point to obtain a full characterization of the vibration. We introduce birefringent beam displacers as a highly efficient beam multiplying method to create a system of four heterodyne interferometers operating in parallel from a single laser source. The design and the performance characteristics (resolution, cross-talk) of the instrument will be discussed. The system revealed the existence of running vibrational modes on an electrically driven plate clamped along its outer edge.
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