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Vol. 131, Issue 8, August 2011, pp.52-60




Highly Sensitive Cadmium Concentration Sensor Using Long Period Grating


1A. S. Lalasangi, 1J. F. Akki, 2K. G. Manohar, 3T. Srinivas, 4Prasad Raikar, 5Sanjay Kher and 1,*U. S. Raikar

1Department of Physics, Karnatak University, Dharwad-580 003, Karnataka, India

2Laser & Plasma Technology Division, BARC, Mumbai, India

3Electrical Communication Engineering Dept., Indian Institute of Science,

Bengaluru, Karnataka, India

4KLE Society’s College of Engineering & Technology, Belgaum, India

5RajaRamanna 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: 31 May 2011   /Accepted: 22 August 2011   /Published: 30 August 2011


Handbook of Laboaratory Measurements book


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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