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Proceedings Paper

Drift in LED-based photometer
Author(s): Kasper M. Paasch; Guenther Tittelbach; Thomas Peschel
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Paper Abstract

During the development of a low cost industrial optical sensor an unexpected drift phenomenon has shown to be critical to performance. The sensor is based on LED's as light sources and the main source of error could be tracked to the instability of the spatial radiation pattern of the LED's. This instability due to the construction of the sensor introduced an error in the intensity feedback loop. Alternative designs including a Y-coupler, a scattering arrangement and a mirror beam splitter have been investigated and the results are presented.

Paper Details

Date Published: 28 September 1999
PDF: 11 pages
Proc. SPIE 3786, Optomechanical Engineering and Vibration Control, (28 September 1999); doi: 10.1117/12.363837
Show Author Affiliations
Kasper M. Paasch, Danfoss A/S (Denmark)
Guenther Tittelbach, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)
Thomas Peschel, Fraunhofer-Institut fuer Angewandte Optik und Feinmechanik (Germany)

Published in SPIE Proceedings Vol. 3786:
Optomechanical Engineering and Vibration Control
Eddy A. Derby; Eddy A. Derby; Colin G. Gordon; Colin G. Gordon; Daniel Vukobratovich; Carl H. Zweben; Daniel Vukobratovich; Paul R. Yoder Jr.; Carl H. Zweben, Editor(s)

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