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Innovative Low-Cost Plastic Optical Fiber Sensors for Gas Monitoring
1  Politecnico di Torino

Abstract: In this study, a new simple and low-cost plastic optical fiber sensor for the measurements of low concentration HF vapors is described. The sensitivity to the HF vapors obtained by deposing a thin glass-like layer onto the PMMA core fiber after removing the fluorinated polymer cladding via dipping the fiber into ethyl acetate for a short period, not more than 40 second. Moreover, in order to enhance the fiber sensitivity, low pressure plasma treatments have been carried out in O2 and Ar gas mixtures, on polymeric optical core fibers in order to increase the core surface area without damaging the PMMA core fiber. The reaction of glass-like layer with the HF vapor alters the fiber light transmission and is detected by means of a wide-band photodiode. The sensor used in this research has several advantages; mainly the ability to evaluate directly the cumulative exposure and the transducer is based on a plastic optical fiber. The POF sensors are designed to monitor low concentration of gaseous pollutants in the RPC (Resistive Plate Chamber) muon detector of the Compact Muon Solenoid (CMS) experiment at the CERN in Geneva and also can be used both in civil and industrial field. Several prototypes of fiber sensors have been fabricated and characterized in the reaction chamber. The obtained results demonstrating the capability to detect low concentration of HF vapors with high sensitivity.
Keywords: POF sensor, HF detector
Comments on this paper
Salvatore Filippo Di Gennaro
gas monitoring in liquid phase
dear authors,
congratulations fo your work, it's very interesting, and I think that the optical fibers are an excellent solution for low cost monitoring techniques.
I'm studying wireless monitoring techniques in wine and I would like to ask  if you have experience of integration of POF measurements on WSN. Have you ever work on low cost POF technique for gas monitoring in liquid phase, as wine?

Maen Ishtaiwi
Dear Filippo,
Thank you for your question.
In this work I used low cost POF for monitoring a specific gas in a mixture of gases.I did not try to monitor gas in liquid phase.
Best regards
Alberto Vallan
we have integrated POF sensors in a WSN for structural monitoring (see paper Crack Monitoring Network Using POF Sensors. In: Lecture Notes in Electrical Engineering, Springer, ISBN 9781461438595). Intensity based fiber sensors are well suited to be integrated in WSN thanks to their low power consumption.
Best regards