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Article RSE 16081795

Intensity-based plastic optical fiber sensor with molecularlyimprinted polymer sensitive layer

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Sensors and Actuators B doi.org/10.1016/j.snb.2016.10.104, vol. 241, pp. 534–540, Ottobre-2016.

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R. Bernini (CNR-IREA), N. Cennamo (Seconda Università di Napoli), G. Testa (CNR-IREA), S. Marchetti (Università di Pavia), L. De Maria (RSE SpA), M. Pesavento (Università di Pavia), L. Zeni (CNR-IREA)

MON4-GRID 2016 - Management, monitoring and control of the transmission grid

In this paper first results of validation of new device for on-line detection of dibenzil disulphide (DBDS) in insulating oils of power transformers are reported; DBDS is one of the main agent of the corrosive sulphur formation in the insulating system of transformers and of the subsequent degradation of its performances.

The possibility of developing a multichannel optical chemical sensor, based on molecularly imprinted polymers (MIPs) and surface plasmon resonance (SPR) in a D-shapedmultimode plastic optical fiber (POF), is presented by two cascaded SPR-POF-MIP sensorswith different thicknesses of the gold layer. The lowcost, the high selectivity and sensitivity of the SPR-POF-MIP platforms and the simple and modular scheme of the optical interrogation layout make this systema potentially suitable on-linemulti-diagnostic tool. As a proof of principle, the possibility of simultaneous determination of two important analytes, dibenzyl disulfide (DBDS) and furfural (2-FAL), in power transformer oil was investigated. Their presence gives useful indication of underway corrosive or ageing processes in power transformers, respectively. Preliminarily, the dependence of the performance of the D-shaped optical platform on the gold film thickness has been studied, comparing two platforms with 30 nm and 60 nm thick gold layers. It has been found that the resonance wavelengths are different on platforms with gold layer of different thickness, furthermorewhen MIPs are present on the gold as receptors, the performances of the platforms are similar in the two considered sensors.

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