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Proceedings Paper

Signal simulation method for homodyne multiple target interferometers using short coherence length laser sources
Author(s): Maik Fox; Thorsten Beuth; Andreas Streck; Wilhelm Stork
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Paper Abstract

Homodyne laser interferometers for the measurement of movement are well-known optical systems used in many applications where exact and contactless velocity sensing is an essential requirement. While the detector output signal of such a system using a long coherence length laser is easily modeled using the Doppler shift, a short coherence length source, e.g. a broad spectrum semiconductor laser, demands a more elaborated approach for simulation.

The work being presented takes a look at a method for efficiently simulating a short coherence length Lorentzian laser source and calculating the interference signal for many point scattering sources moving through space within a continuously changing coherence function. The detector’s time domain signal and its frequency domain spectrum will be calculated and evaluated. The results of the proposed simulation method are then compared to theoretical analyses found in literature.

Paper Details

Date Published: 21 June 2015
PDF: 11 pages
Proc. SPIE 9526, Modeling Aspects in Optical Metrology V, 952609 (21 June 2015); doi: 10.1117/12.2184767
Show Author Affiliations
Maik Fox, Karlsruher Institut für Technologie (Germany)
Thorsten Beuth, Karlsruher Institut für Technologie (Germany)
Andreas Streck, ELOVIS GmbH (Germany)
Wilhelm Stork, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 9526:
Modeling Aspects in Optical Metrology V
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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