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Vol. 94, Issue 7, July 2008, pp.116-125




C-PFM Multiplexed Interrogation Technique for FBG Sensors with Time-Windowing Reduced Crosstalk


L. Rossi(a), G. Breglio(a),A. Cusano(b), A. Irace(a), V. Pascazio(c) and A. Cutolo(b)

 a) Dipartimento di Ingegneria Elettronica e delle Telecomunicazioni, Universitą di Napoli Federico II, via Claudio 21, 80125, Napoli, Italy
Tel.: +39 081 7683128, fax: +39 081 5934448, e-mail breglio@unina.it

b) Facoltą di Ingegneria, Universitą del Sannio, Corso Garibaldi, Benevento, Italy, Tel. +39 0824 305815, e-mail: cutolo@unisannio.it

c) Dipartimento di Ingegneria, Universitą Parthenope, Via Acton 38, Napoli, Italy,
Tel +39081 5475111, e-mail pascazio@uninav.it



Received: 24 April 2008   /Accepted: 21 July 2008   /Published: 31 July 2008


Abstract: In this paper, we propose an improvement of the Chirped-Pulsed Frequency Modulation (C-PFM) FBGs multiplexing technique as supported by new experimental results. C-PFM, which is basically translated from its counterpart in the field of radar signal analysis, improves the spatial resolution of the acquisition system by means of a pulsed-chirped modulation of the probe signal (the light traveling along the fiber in our case) and a novel matched numerical filtering, whereas the readout of the FBG sensors response is obtained with an in-fiber linear optical filter. Using a peculiar time window shaping of the light pulse we improved the cross-talk feature of the multiplexing technique up to -40 dB.


Keywords: FBGs sensors, Multiplexing, Sensors Networks, C-PFM


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