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Filter-based interrogation of fiber bragg grating sensors

: Wuchrer, Roland; Lautenschläger, Harald; Metasch, René; Röllig, Mike; Fleischer, Thomas; Härtling, Thomas


Franz, M. ; Institute of Electrical and Electronics Engineers -IEEE-:
37th International Spring Seminar in Electronics Technology, ISSE 2014. Proceedings : Dresden, Germany, 7 - 11 May 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-4454-5
ISBN: 978-1-4799-4455-2
International Spring Seminar in Electronics Technology (ISSE) <37, 2014, Dresden>
Conference Paper
Fraunhofer IKTS ()

We present a compact and robust interrogation device for the read out of fiber Bragg grating sensors. The core system consists of a dielectric thin film filter with a lateral spectral transmission gradient and a photo diode array. This allows a high resolution detection of the Bragg wavelength shift by means of a centroid measurement. We first show the functionality of the system with a temperature measurement on a fiber Bragg grating. We achieved a temperature resolution of 0.2 K and an accuracy of ± 2 K, which correspond to a spectral resolution of 1 pm and an accuracy of ± 11 pm. On the basis of these results, we developed a specially adapted high sensitivity electronics and a robust packaging for the applications on pipeline structures.