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Quasi-distributed measurement on femtosecond laser-induced scattering voids using incoherent OFDR and OTDR

: Liehr, S.; Burgmeier, J.


Jaroszewicz, L.R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fifth European Workshop on Optical Fibre Sensors 2013 : 19 - 22 May 2013, Kraków, Poland
Bellingham, WA: SPIE, 2013 (Proceedings of SPIE 8794)
ISBN: 978-0-8194-9634-8
Paper 87943N
European Workshop on Optical Fibre Sensors (EWOFS) <5, 2013, Kraków>
Fraunhofer HHI ()

We propose to use focused femtosecond laser pulses to create scattering damage in standard singlemode optical fibres as reference points for quasi-distributed sensing applications. Such sensor fibres are interrogated with incoherent optical frequency domain reflectometry (I-OFDR) technique and optical time domain reflectometry (OTDR). A performance comparison of both techniques with the clear advantage of the I-OFDR is presented as well as a quasi-distributed length change measurement application. Also dynamic measurement based on the I-OFDR technique is demonstrated on a femtosecond laser-induced sensor chain.