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Proceedings Paper

Concept and design of an FBG emulator for a scanning laser-based fiber optic interrogator
Author(s): Nader Kuhenuri; Philipp Putzer; Alexander W. Koch; Johannes Obermaier; Sebastian Schweyer; Andreas Hurni
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Paper Abstract

The Hybrid Sensor Bus is a space-borne temperature monitoring system for telecommunication satellites com­ bining electrical and fiber-optical Fiber Bragg Grating (FBG) sensors. Currently, there is no method available for testing the functionality and robustness of the system without setting up an actual sensor-network implying numerous FBG sensors in which each has to be heated/cooled individually. As a verification method of the mentioned system, FBG reflection based scanning laser interrogator, an FBG­ emulator is implemented to emulate the necessary FBG sensors. It is capable of immediate emulation of any given FBG spectrum, thus, any temperature. The concept provides advantages like emulating different kinds of FBGs with any peak shape, variable Bragg-wavelength λB, maximal-reflectivity τmax, spectral-width and degradation characteristics. Further, it facilitates an efficient evaluation of different interrogator peak-finding algorithms and the capability of emulating up to 10000 sample points per second is achieved. In the present paper, different concepts will be discussed and evaluated yielding to the implementation of a Variable Optical Attenuator (VOA) as the main actuator of the emulator. The actuator choice is further restricted since the emulator has to work with light in unknown polarization state. In order to implement a fast opto-ceramic VOA, issues like temperature dependencies, up to 200 V driving input and capacitive load have to be overcome. Furthermore, a self-calibration procedure mitigates problems like attenuation losses and long-term drift.

Paper Details

Date Published: 18 June 2014
PDF: 10 pages
Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 90980D (18 June 2014); doi: 10.1117/12.2049949
Show Author Affiliations
Nader Kuhenuri, Technische Univ. München (Germany)
Philipp Putzer, Technische Univ. München (Germany)
Alexander W. Koch, Technische Univ. München (Germany)
Johannes Obermaier, Kayser-Threde GmbH (Germany)
Sebastian Schweyer, Kayser-Threde GmbH (Germany)
Andreas Hurni, Kayser-Threde GmbH (Germany)

Published in SPIE Proceedings Vol. 9098:
Fiber Optic Sensors and Applications XI
Henry H. Du; Gary Pickrell; Eric Udd; Christopher S. Baldwin; Jerry J. Benterou; Anbo Wang, Editor(s)

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