Refractive index sensor employing PVA-coated long period grating technology

L. Alwis; K. Bremer; T. Sun; K. T. V. Grattan

doi:10.1117/12.974682

17 October 2012 Refractive index sensor employing PVA-coated long period grating technology

L. Alwis, K. Bremer, T. Sun, K. T. V. Grattan

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84214I (2012) https://doi.org/10.1117/12.974682
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

The sensitivity of a Long Period Grating (LPG)-based refractive index (RI) sensor has been enhanced through an appropriate coating of a thin polymer layer, with a higher RI than that of the cladding, on the LPG. The performance of the coated sensor, together with a bare LPG, was evaluated as a chemical sensor when the sodium chloride concentration in water varies from 0.01% to 2%. The corresponding attenuation band shifts of both sensors in response to the RI change were observed. The experimental results confirmed that the coated LPG sensor has higher sensitivity than that of the bare LPG sensor.

Citation Download Citation

L. Alwis, K. Bremer, T. Sun, and K. T. V. Grattan "Refractive index sensor employing PVA-coated long period grating technology", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84214I (17 October 2012); https://doi.org/10.1117/12.974682

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