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Optical Engineering

Refractive index and concentration sensing of solutions using mechanically induced long period grating pair
Author(s): Vandana Mishra; Nahar Singh; Subhash C. Jain; Palvinder Kaur; Ruchi Luthra; Himani Singla; V. K. Jindal; Ram Prasad Bajpai
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Paper Abstract

We demonstrate the use of a pair of mechanically induced long period gratings (LPGs) for sensing the refractive index and concentration of liquids for which NaCl solutions of different concentrations and standard refractive index liquids are studied. The effect of varying the refractive index and/or concentration is reflected in changing output power loss values at resonance wavelengths. For a concentration change from 5 to 20 g per 100 ml, the maximum variation detected in optical output power is 20 pW, while for a refractive index variation from 1.446 to 1.458, it is 11 pW. These studies are quite useful for chemical, pharmaceutical, biological, and process control sensing applications.

Paper Details

Date Published: 1 September 2005
PDF: 4 pages
Opt. Eng. 44(9) 094402 doi: 10.1117/1.2054627
Published in: Optical Engineering Volume 44, Issue 9
Show Author Affiliations
Vandana Mishra, Central Scientific Instruments Organisation (India)
Nahar Singh, Central Scientific Instruments Organisation (India)
Subhash C. Jain, Central Scientific Instruments Organisation (India)
Palvinder Kaur, Central Scientific Instruments Organisation (India)
Ruchi Luthra, Central Scientific Instruments Organisation (India)
Himani Singla, Central Scientific Instruments Organisation (India)
V. K. Jindal, Panjab Univ. (India)
Ram Prasad Bajpai, Panjab Univ. (India)

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