Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Sensors & Transducers Journal 2010 Sensors & Transducers Journal 2009 Sensors & Transducers Journal 2008 Sensors & Transducers Journal 2007 2000-2002 S&T e-Digest Contents
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Vol. 134, Issue 11, November 2011, pp.76-84
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Highly Sensitive Cadmium Concentration Sensor Using Long Period Grating 1A. S. Lalasangi, 1J. F. Akki, 2 K. G. Manohar, 3 T. Srinivas, 4 Prasad Raikar, 5 Sanjay Kher and 1,* U. S. Raikar 1 Department of Physics, Karnatak University, Dharwad-580 003, Karnataka, India 2 Laser &Plasma Technology Division, BARC, Mumbai, India 3 Electrical Communication Engineering Dept., Indian Institute of Science, Bengaluru, Karnataka, India 4 KLE Society’s College of Engineering & Technology, Belgaum, India 5 RajaRamanna Center for Advanced Technology, Indore, Madhya Pradesh, India Tel.: +91-836-2215316(0), +91-836-2772550(R) *E-mail: usraykar_kud@yahoo.co.in
Received: 21 August 2011 /Accepted: 21 November 2011 /Published: 29 November 2011 |
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Abstract: In this paper we have proposed a simple and effective Long Period Grating chemical sensor for detecting the traces of Cadmium (Cd++) in drinking water at ppm level. Long Period gratings (LPG) were fabricated by point-by-point technique with CO2 laser. We have characterized the LPG concentration sensor sensitivity for different solutions of Cd concentrations varying from 0.01 ppm to 0.04 ppm by injecting white Light source and observed transmitted spectra using Optical Spectrum Analyzer (OSA). Proper reagents have been used in the solutions for detection of the Cd species. The overall shift in wavelength is 10 nm when surrounding medium gradually changed from water to 0.04 ppm of cadmium concentrations. A comparative study has been done using sophisticated spectroscopic atomic absorption spectrometer (AAS) and Inductively Coupled Plasma (ICP) instruments. The spectral sensitivity enhancement was done by modifying grating surface with gold nanoparticles.
Keywords: Long period grating (LPG), Point by Point technique, Chemical sensor, Cadmium, Aqueous gold nanoparticles
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