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12 May 2015 Error motion compensating tracking interferometer for the position measurement of objects with rotational degree of freedom
Mirko Holler, Jörg Raabe
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Optical Engineering, Vol. 54, Issue 5, 054101 (May 2015). https://doi.org/10.1117/1.OE.54.5.054101
Abstract
The nonaxial interferometric position measurement of rotating objects can be performed by imaging the laser beam of the interferometer to a rotating mirror which can be a sphere or a cylinder. This, however, requires such rotating mirrors to be centered on the axis of rotation as a wobble would result in loss of the interference signal. We present a tracking-type interferometer that performs such measurement in a general case where the rotating mirror may wobble on the axis of rotation, or even where the axis of rotation may be translating in space. Aside from tracking, meaning to measure and follow the position of the rotating mirror, the interferometric measurement errors induced by the tracking motion of the interferometer itself are optically compensated, preserving nanometric measurement accuracy. As an example, we show the application of this interferometer in a scanning x-ray tomography instrument.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Mirko Holler and Jörg Raabe "Error motion compensating tracking interferometer for the position measurement of objects with rotational degree of freedom," Optical Engineering 54(5), 054101 (12 May 2015). https://doi.org/10.1117/1.OE.54.5.054101
Published: 12 May 2015
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Cited by 35 scholarly publications and 1 patent.
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KEYWORDS
Interferometers
Mirrors
Optical spheres
Optical tracking
Spherical lenses
X-rays
Interferometry
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