Refractive index measurement using multimode fibers with long period grating

2004 ◽  
Author(s):  
Vinu V. Namboodiri ◽  
Abraham V. Scaria ◽  
V.P.N. Nampoori ◽  
V.M. Nandakumaran ◽  
P. Radhakrishnan
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Refractive Index Measurement ◽  
Multimode Fibers ◽  
Long Period ◽  
Index Measurement

Dual-resonance long-period grating in fiber loop mirror structure for liquid refractive index measurement

2018 ◽  
Vol 26 (1) ◽  
pp. 24-28 ◽  
Author(s):  
R. Zawisza ◽  
T. Eftimov ◽  
P. Mikulic ◽  
Y. Chinifooroshan ◽  
A. Celebańska ◽  
...  
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Refractive Index Measurement ◽  
Long Period ◽  
Index Measurement ◽  
Dual Resonance ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Mirror Structure ◽  
Fiber Loop

scholarly journals Fibre Tip Sensor with Embedded FBG-LPG for Temperature and Refractive Index Determination by means of the Simple Measurement of the FBG Characteristics

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
C. Berrettoni ◽  
C. Trono ◽  
V. Vignoli ◽  
F. Baldini
Keyword(s):  
Refractive Index ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Refractive Index Measurement ◽  
Long Period ◽  
Index Measurement ◽  
Simple Measurement ◽  
The Difference ◽  
Different Response ◽  
Hybrid Configuration

A novel optical fibre sensing system based on a hybrid long period grating (LPG) and Bragg grating (FBG) configuration is proposed and demonstrated experimentally. The hybrid configuration, which uses the difference in temperature and refractive index (RI) different response of a Bragg grating and a long period grating, makes it possible to discriminate simultaneously the temperature and the refractive index of different aqueous solutions. RI (1.33 RIU–1.40 RIU) and temperature (21°C–28°C) working ranges have been experimentally determined. Experimental results show that the maximum accuracy in the refractive index measurement (0.004 RIU) with temperature compensation has been achieved within the working ranges.

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