Calibration of etched fiber bragg grating sensor arrays for measurement of molecular surface adsorption

Mudachathi, Renilkumar and Shivananju, Nanjunda B and Prashanth, Gurusiddappa R and Asokan, Sundararajan and Varma, Manoj M (2013) Calibration of etched fiber bragg grating sensor arrays for measurement of molecular surface adsorption. In: Journal of Lightwave Technology, 31 (14). pp. 2400-2406.

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Abstract

Etched Fiber Bragg Grating (EFBG) sensors are attractive from the point of the inherently high multiplexing ability of fiber based sensors. However, the strong dependence of the sensitivity of EFBG sensors on the fiber diameter requires robust methods for calibration when used for distributed sensing in a large array format. Using experimental data and numerical modelling, we show that knowledge of the wavelength shift during the etch process is necessary for high-fidelity calibration of EFBG arrays. However as this approach requires the monitoring of every element of the sensor array during etching, we also proposed and demonstrated a calibration scheme using data from bulk refractometry measurements conducted post-fabrication without needing any information about the etching process. Although this approach is not as precise as the first one, it may be more practical as there is no requirement to monitor each element of the sensor array. We were able to calibrate the response of the sensors to within 3% with the approach using information acquired during etching and to within 5% using the post-fabrication bulk refractometry approach in spite of the sensitivities of the array element differing by more than a factor of 4. These two approaches present a tradeoff between accuracy and practicality.

Item Type:	Journal Article
Publication:	Journal of Lightwave Technology
Publisher:	IEEE-Inst Electrical Electronics Engineers Inc
Additional Information:	Copyright of this article belongs to IEEE-Inst Electrical Electronics Engineers Inc.
Keywords:	Etched Fiber Bragg Grating; FBG Sensor Arrays; Fiber Array Based Biosensing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	02 Sep 2013 06:32
Last Modified:	02 Sep 2013 06:32
URI:	http://eprints.iisc.ac.in/id/eprint/46956

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