Virginia TechKim, D. W.Zhang, Y.Cooper, K. L.Wang, Anbo2014-04-042014-04-042005-04-01Dae Woong Kim, Yan Zhang, Kristie L. Cooper, and Anbo Wang, "In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement," Appl. Opt. 44, 5368-5373 (2005). doi: 10.1364/ao.44.0053681559-128Xhttp://hdl.handle.net/10919/46919We present two novel schemes for refractometry based on a long-period fiber grating- (LPG-) based Michelson interferometer. These schemes are designed to overcome the measurement dependence of previously demonstrated LPG-based refractometry on the immersion depth. The first utilizes an unshielded LPG and the second, a shielded one. Both schemes were tested over a certain refractive-index range, and the measurement of glucose concentration in water was experimentally demonstrated. In addition, the temperature sensitivity of the two schemes is discussed. (c) 2005 Optical Society of America.application/pdfen-USIn CopyrightSensorsArticle - Refereedhttp://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-26-5368https://doi.org/10.1364/ao.44.005368