Refractive index sensor employing PVA-coated long period grating technology

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

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.

• Presentation Conference Type: Conference Paper (Published)
• Conference Name: OFS2012 22nd International Conference on Optical Fiber Sensors
• Start Date: Oct 14, 2012
• End Date: Oct 17, 2012
• Acceptance Date: Jun 1, 2012
• Publication Date: Oct 17, 2012
• Deposit Date: Feb 4, 2020
• Publisher: Society of Photo-optical Instrumentation Engineers
• Series Title: Proceedings of SPIE, the International Society for Optical Engineering
• Series Number: 8421
• Series ISSN: 0277-786X
• Book Title: Proceedings Volume 8421 OFS2012 22nd International Conference on Optical Fiber Sensor
• ISBN: 9780819491039
• DOI: https://doi.org/10.1117/12.974682
• Public URL: http://researchrepository.napier.ac.uk/Output/947741
• Publisher URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8421/84214I/Refractive-index-sensor-employing-PVA-coated-long-period-grating-technology/10.1117/12.974682.short?SSO=1