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Sensitivity optimization of POF sensors based on an intensity low-cost configuration targeting chemical and biochemical sensing

Sequeira, F. ; Nogueira, R.N. ; Rudnitskaya, Rudnitskaya, A. ; Cennamo, N. ; Zeni, L. ; Bilro, L.

Sensitivity optimization of POF sensors based on an intensity low-cost configuration targeting chemical and biochemical sensing, Proc International Conference on Plastic Optical Fibres - POF , Aveiro, Portugal, Vol. , pp. paper 90-1 - paper 90-4, September, 2017.

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Abstract
We report the development of RI POF sensors for water quality assessment using simple, fast and low-cost methods. The modification of the surface roughness of the POF’s sensing region allowed to increase the sensor’s sensitivity. The optical monitoring was performed through an intensity-based low-cost system comprising a LED, an optical coupler and two photodetectors. These sensors can be used for liquid refractive index sensing with 10-4 RIU resolution and future developments aim chemical and biochemical sensing using selective layers.