Reflective long period grating based temperature sensor

Sohel Rana; Nirmala Kandadai; Harish Subbaraman

doi:10.1117/12.2576989

5 March 2021 Reflective long period grating based temperature sensor

Sohel Rana, Nirmala Kandadai, Harish Subbaraman

Proceedings Volume 11682, Optical Components and Materials XVIII; 1168219 (2021) https://doi.org/10.1117/12.2576989
Event: SPIE OPTO, 2021, Online Only

Abstract

We experimentally demonstrate a reflective long period grating based temperature sensor with a temperature sensitivity coefficient of 0.046 nm/°C in the range between 23°C and 200°C. Compared to traditional metal coating methods, such as evaporation, we used a cost-effective brush coating method to coat silver on both the end facet and a 60cm long tail end of the fiber beyond a long period grating (LPG) to realize a reflection mode LPG. The measured optical spectrum of the fabricated reflective LPG completely mimics the transmitted spectrum with reduced intensity. This cost-effective method for coating metal will pave the way for inexpensive LPG and other optical fiber sensor manufacturing and widespread utilization.

Conference Presentation

Citation Download Citation

Sohel Rana, Nirmala Kandadai, and Harish Subbaraman "Reflective long period grating based temperature sensor", Proc. SPIE 11682, Optical Components and Materials XVIII, 1168219 (5 March 2021); https://doi.org/10.1117/12.2576989

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