Next Article in Journal
A Vision-Based Dynamic Rotational Angle Measurement System for Large Civil Structures
Previous Article in Journal
The Camera Itself as a Calibration Pattern: A Novel Self-Calibration Method for Non-Central Catadioptric Cameras
Sensors 2012, 12(6), 7318-7325; doi:10.3390/s120607318

A Hybrid LPG/CFBG for Highly Sensitive Refractive Index Measurements

*  and
International Institute for Urban Systems Engineering, Southeast University, Nanjing 210096, Jiangsu, China
* Author to whom correspondence should be addressed.
Received: 28 March 2012 / Revised: 18 April 2012 / Accepted: 28 April 2012 / Published: 30 May 2012
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [229 KB, uploaded 21 June 2014]   |   Browse Figures


A simple and high sensitive method employing a hybrid long period grating (LPG)/chirped fiber Bragg grating (CFBG) for refractive index (RI) measurements is proposed and investigated experimentally. The wide wavelength range of backward cladding modes are excited through the coupling and recoupling between LPG and CFBG. Experimental results indicate that the recoupled cladding modes between LPG and CFBG and core mode are modulated by the surrounding RI and highly sensitive RI measurements can be achieved by simply measuring the reflected intensity changes of the recoupled cladding modes and core mode.
Keywords: optical fiber sensor; refractive index; hybrid FBG/LPG; cladding modes optical fiber sensor; refractive index; hybrid FBG/LPG; cladding modes
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
MDPI and ACS Style

Sun, A.; Wu, Z. A Hybrid LPG/CFBG for Highly Sensitive Refractive Index Measurements. Sensors 2012, 12, 7318-7325.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here


[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert