Simultaneous measurement of refractive index and temperature based on multimode interference inside a fiber loop mirror

2012 ◽  
Author(s):  
C. Gouveia ◽  
G. Chesini ◽  
J. M. Baptista ◽  
C. M. B. Cordeiro ◽  
P. A. S. Jorge
Keyword(s):  
Refractive Index ◽  
Simultaneous Measurement ◽  
Multimode Interference ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Fiber Loop

scholarly journals Ambient Refractive-Index Measurement with Simultaneous Temperature Monitoring Based on a Dual-Resonance Long-Period Grating Inside a Fiber Loop Mirror Structure

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2370 ◽  
Author(s):  
Renata Zawisza ◽  
Tinko Eftimov ◽  
Predrag Mikulic ◽  
Wojtek Bock ◽  
Leszek Jaroszewicz
Keyword(s):  
Refractive Index ◽  
Experimental Results ◽  
Refractive Index Sensor ◽  
Long Period Grating ◽  
Long Period ◽  
Dual Resonance ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Optical Structure ◽  
Fiber Loop

In this work, we report the experimental results on optimizing the optical structure for ambient refractive index measuring with temperature changes monitoring. The presented optical structure is based on a dual-resonance long-period grating embedded inside a fiber loop mirror, where the long-period grating acts as the head of the refractive-index sensor, whereas the section of polarization maintaining fiber in the loop mirror ensures suitable temperature sensing. The optimization process was comprised of tuning the resonance and interferometric peaks by changing the state of polarization of propagating beams. Experimental results establish that the response of the proposed sensor structure is linear and goes in opposite directions: an increase in the ambient refractive index reduces the signal response, whereas a temperature increase produces an increased response. This enables us to distinguish between the signals from changes in the refractive index and temperature. Due to the filtering properties of the interferometric structure, it is possible to monitor variation in these physical parameters by observing optical power changes instead of wavelength shifts. Hence, the refractive index sensitivity has been established up to 2375.8 dB/RIU in the narrow RI range (1.333–1.341 RIU) and temperature sensitivities up to 1.1 dBm/°C in the range of 23–41 °C. The proposed sensor is dedicated to advanced chemical and biological sensor applications.

Liquid Refractive Index Sensor Based on a Polarization-Maintaining Fiber Loop Mirror

2013 ◽  
Vol 13 (5) ◽  
pp. 1721-1724 ◽  
Author(s):  
Jianfeng Wang ◽  
Changyu Shen ◽  
Yanfang Lu ◽  
Debao Chen ◽  
Chuan Zhong ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Fiber Loop
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