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Advances in Optical Technologies
Volume 2013 (2013), Article ID 948638, 9 pages
Research Article

Experiments on the Porch Swing Bearing of Michelson Interferometer for Low Resolution FTIR

Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland

Received 22 March 2013; Accepted 8 May 2013

Academic Editor: Joseph Rosen

Copyright © 2013 Tuomas Välikylä and Jyrki Kauppinen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Porch swing bearing for the linear motion of the mirror in Michelson interferometer for mid-infrared low resolution Fourier transform spectrometer was studied experimentally using the modulation depth of the collimated laser beam. The mirror tilting was measured to be lower than 5 μrad over 3 mm mirror travel using two different bearings assemblies. Additionally, the manufacturing tolerances of the bearing type were proved to be loose enough not to limit the interferometer application. These demonstrate that the porch swing without any adjustment mechanisms provides the sufficient motion linearity.