Side polished fiber Bragg grating sensor for simultaneous measurement of refractive index and temperature

A fiber sensor to achieve simultaneous measurement of refractive index and temperature is proposed by using a side polished fiber Bragg grating. The reflective wavelength of side polished fiber Bragg grating shifts with the ambient refractive index and local temperature. By overlaying half of the polished surface of fiber Bragg grating with liquid material, simultaneous discrimination of liquid refractive index and local temperature with dual reflective Bragg wavelengths is demonstrated. The refractive index sensitivity is from 4.99nm/riu to 252.78nm/riu when refractive index changes from 1.4098 to 1.4479, and the temperature sensitivity is 0.012nm/°C.

[1]  Chongxiu Yu,et al.  Temperature-insensitive chemical sensor based on a fiber Bragg grating , 2007 .

[2]  A.P. Zhang,et al.  Sandwiched long-period gratings for simultaneous measurement of refractive index and temperature , 2005, IEEE Photonics Technology Letters.

[3]  Jun Chen,et al.  Design and characteristics of refractive index sensor based on thinned and microstructure fiber Bragg grating. , 2008, Applied optics.

[4]  Wei Zhang,et al.  Simultaneous refractive index and temperature measurement using a cascaded long-period grating device , 2002, Proceedings of IEEE Sensors.

[5]  Sailing He,et al.  Simultaneous Measurement of Refractive Index and Temperature by Using Dual Long-Period Gratings With an Etching Process , 2007, IEEE Sensors Journal.

[6]  M.S. Demokan,et al.  Simultaneous temperature and refractive index measurements using a 3/spl deg/ slanted multimode fiber Bragg grating , 2006, Journal of Lightwave Technology.

[7]  S. Campopiano,et al.  Nonuniform thinned fiber Bragg gratings for simultaneous refractive index and temperature measurements , 2005, IEEE Photonics Technology Letters.

[8]  Agostino Iadicicco,et al.  Not-lithographic fabrication of micro-structured fiber Bragg gratings evanescent wave sensors. , 2009, Optics express.

[9]  Li Zhen,et al.  The Effect of Refractive Index of Material Overlaid Side Polished Area of FBG on Bragg Wavelength , 2007 .

[10]  Ilda Abe,et al.  Determination of thermo-optic coefficient in liquids with fiber Bragg grating refractometer , 2008 .

[11]  A. Cusano,et al.  Thinned fiber Bragg gratings as refractive index sensors , 2005, IEEE Sensors Journal.

[12]  C.-F. Chan,et al.  Evanescent field fiber Bragg grating sensors for index of refraction sensing with applications to structural health monitoring , 2006, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.