Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 45: SYPC: From Atoms to Photonic Circuits 2
Q 45.6: Talk
Thursday, March 15, 2012, 15:45–16:00, V47.01
Arrayed waveguide grating based interrogator for fiber Bragg grating sensors: measurement and simulation — •Jan Koch1,2, Martin Angelmahr1, and Wolfgang Schade1,2 — 1Fraunhofer Heinrich Hertz Institute, Am Stollen 19B, 38640 Goslar, Germany — 2Clausthal University of Technology, Am Stollen 19B, 38640 Goslar, Germany
Fiber Bragg grating (FBG) strain sensors offer great potential. Compared to strain gauges they are small and lightweight, can easily be multiplexed, and are immune to electromagnetic disturbance. In addition the new femtosecond laser processed FBG sensors are very robust and easy to handle. However, the main disadvantage of those fiber-optical measurement systems lies within the applied FBG interrogator, which usually consists of expensive and fragile components.
In this work a FBG interrogator based on an arrayed waveguide grating (AWG) chip, known as cost efficient and very stable multi-/demultiplexer module in the telecommunication industry, is presented. In order to achieve high wavelength resolution, the interpretation of the response signal of the FBG strain sensors has to be done very carefully. Hence, the required evaluation algorithm is examined in detail. The corresponding calibration parameters are determined by calibration measurements and by simulations. The system simulation provides additional information for the error estimation of the measurand.