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Proceedings Paper

High-precision length measurement by means of multisensory laser-feedback interferometry
Author(s): Thomas Allgeier; Heinrich A. Hoefler; Elmar E. Wagner
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Paper Abstract

We present a novel velocity and length measuring instrument based on laser-feedback interferometry. Uncertainties down to 10-4 in length measurement of moving materials can be achieved by combining the measurement signals of two separate sensors. Furthermore the dependence on parameters like the angle of incidence can be eliminated mathematically and no accurate alignment is required. The signal processing unit utilizes a real-time fast Fourier transformation. Thus good signal to noise ratios and very accurate measurements of most scattering surfaces used in industrial production are possible.

Paper Details

Date Published: 1 June 1998
PDF: 7 pages
Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); doi: 10.1117/12.307686
Show Author Affiliations
Thomas Allgeier, Fraunhofer-Institute of Physical Measurement Techniques (Germany)
Heinrich A. Hoefler, Fraunhofer-Institute of Physical Measurement Techniques (Germany)
Elmar E. Wagner, Fraunhofer-Institute of Physical Measurement Techniques (Germany)


Published in SPIE Proceedings Vol. 3411:
Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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