1 September 2005 Refractive index and concentration sensing of solutions using mechanically induced long period grating pair
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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.
Vandana Mishra, Nahar Singh, Subhash C. Jain, Palvinder Kaur, Ruchi Luthra, Himani Singla, V. K. Jindal, Ram Prasad Bajpai, "Refractive index and concentration sensing of solutions using mechanically induced long period grating pair," Optical Engineering 44(9), 094402 (1 September 2005). https://doi.org/10.1117/1.2054627
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