1. Measurements of refractive index sensitivity using long-period grating refractometer
- Author
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Chong, Joo Hin, Shum, Ping, Haryono, H., Yohana, A., Rao, M.K., Lu, Chao, and Zhu, Yinian
- Subjects
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REFRACTOMETERS , *OPTICAL instruments , *DIFFRACTION gratings , *CARBON dioxide lasers , *OPTICAL communications - Abstract
We report the development and demonstration of a long-period grating refractometer. The principle of operation is based on the using of a long-period grating that is structurally induced by a CO2 laser, and where the resonance wavelengths are shifted as the refractive index of medium surrounding the cladding of the long-period grating. The different concentrations for three types of solutions (ethylene glycol, salt, and sugar) were experimentally measured, and results show that, as a refractometer, this fiber-based device not only can differentiate chemicals based on their refractive index, but it can also become a concentration indicator of a particular chemical solution, and applied in the oil and petroleum industry. [Copyright &y& Elsevier]
- Published
- 2004
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