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Cd concentration sensor based on fiber grating technology

Raikar, US and Lalasangi, AS and Akki, Jyoti F and Raikar, Prasad and Manohar, KG and Srinivas, T and Badiger, NM and Radhakrishnan, P (2012) Cd concentration sensor based on fiber grating technology. In: Sensors and Actuators B: Chemical, 161 (1). pp. 818-823.

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Official URL: http://dx.doi.org/10.1016/j.snb.2011.11.039


Fiber Bragg grating (FBG) and Long Period Grating (LPG) chemical sensors are one of the most exciting developments in the field of optical fiber sensors. In this paper we have proposed a simple and effective chemical sensor based on FBG and LPG techniques for detecting the traces of cadmium (Cd) in drinking water at ppm level. The sensitiveness of these two has been compared. Also, these results have been compared with the results obtained by sophisticated spectroscopic atomic absorption and emission spectrometer instruments. For proper designing of FBG to act as a concentration sensor, the cladding region of the grating has been etched using HF solution. We have characterized the FBG concentration sensor sensitivities for different solutions of Cd concentrations varying from 0.01 ppm to 0.04 ppm and observed reflected spectrum in FBG and transmitted spectrum in LPG using Optical Spectrum Analyzer. Proper reagents have been used in the solutions for detection of the Cd species. The overall shift in wavelength is 10 nm in case of LPG and the shift of Bragg wavelength is 0.07 nm in case of FBG for 0.01-0.04 ppm concentrations. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: Sensors and Actuators B: Chemical
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 18 Apr 2012 05:20
Last Modified: 18 Apr 2012 05:20
URI: http://eprints.iisc.ac.in/id/eprint/44313

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