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Proceedings Paper

Theoretical modeling of the laser feedback technique for length measurement of moving materials
Author(s): Thomas Allgeier; Heinrich A. Hoefler; Elmar E. Wagner
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Paper Abstract

This paper reports a theoretical description of a recently proposed length sensor using the laser-feedback technique. It is found that the optical feedback causes a sinusoidal fluctuation of the emission frequency with respect to time. The amplitude of the fluctuation strongly depends on the power reflectivity of the target and therefore the target distance. For target power reflectivities below 10-4 stable single-mode laser oscillation is maintained and accurate measurements of target displacement are possible. Good agreement between theoretically calculated device output and measured device output has been obtained. Furthermore typical application examples for dielectric and metallic target materials are presented and some performance characteristics are discussed.

Paper Details

Date Published: 21 September 1999
PDF: 13 pages
Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); doi: 10.1117/12.364287
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. 3824:
Optical Measurement Systems for Industrial Inspection
Malgorzata Kujawinska; Wolfgang Osten, Editor(s)

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