Highly Sensitive Cadmium Concentration Sensor Using Long Period Grating
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 sens...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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IFSA Publishing, S.L.
2011-08-01
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| Series: | Sensors & Transducers |
| Subjects: | |
| Online Access: | http://www.sensorsportal.com/HTML/DIGEST/august_2011/P_839.pdf |
| Summary: | 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.
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| ISSN: | 2306-8515 1726-5479 |