Transient dynamic distributed strain sensing using photonic crystal waveguides

Sagar, Hosangadi Prutvi and Mahalingam, Vignesh and Mahapatra, Debiprosad Roy and Hegde, Gopalkrishna and Hanagud, Sathyanarayana and Rahman, Mohammad Rizwanur (2017) Transient dynamic distributed strain sensing using photonic crystal waveguides. In: APPLIED OPTICS, 56 (28). pp. 7877-7885.

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Abstract

This paper presents a new type of one-dimensional photonic crystal (PC) waveguide sensor and a technique for prediction of transient strain response accurately. The PC waveguide is integrated on a silicon substrate. We investigate the effect of non-uniform strain localization on the optical signal and use that information to capture the transient strain. Wavelength shift due to distributed strain field is modeled by incorporating the mechanically deformed geometry and photo-acoustic coupling through Pockels effect in a finite element formulation. We demonstrate the advantages of using our proposed method, where multiple spectral peak shift is used instead of single peak shift in order to improve sensing output accuracy and also to estimate the sensor parameter regressively, where the signal's bandwidth is limited. The maximum sensitivity of the waveguide sensor in terms of wavelength shift is estimated to be 0.36 pm/mu strain in single-peak-based sensing, whereas the proposed adaptive multispectral estimation scheme shows an enhanced sensitivity of 4.029 pm/mu strain. (C) 2017 Optical Society of America

Item Type:	Journal Article
Publication:	APPLIED OPTICS
Additional Information:	Copy right for this article belongs to the OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	21 Oct 2017 06:18
Last Modified:	21 Oct 2017 06:18
URI:	http://eprints.iisc.ac.in/id/eprint/58043

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