Long-period grating fiber sensor with fiber Bragg grating demodulator

1998 ◽  
Author(s):  
Wei Zhao ◽  
Richard O. Claus
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Sensor ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period

Multi-parameter Simultaneously Sensing Based on an Optimized Concatenated FBG with LPG

2015 ◽  
Vol 36 (2) ◽  
Author(s):  
Yong Chen ◽  
Bao-lin Liu ◽  
Huan-lin Liu ◽  
Kai Yang ◽  
Li-juan Chen
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Reflection Spectrum ◽  
Optical Fiber Sensor ◽  
Reference Value ◽  
Fiber Sensor ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period ◽  
Index Changes

AbstractWe analyze an optical fiber sensor based on a concatenated fiber Bragg grating (FBG) with long period grating (LPG) with transfer matrix method and experiment. First, we optimize parameters of concatenated structure in the method of simulation and discuss the influence that the lengths, periods and dc induced index changes of FBG and LPG and length of optical fiber between LPG and FBG has to influence reflection spectrum. Second, based on the optimized parameters for concatenated structure, fabricate such structure and use it to monitor concentration and temperature simultaneously. Simulation result proves that increasing the lengths of FBG and LPG properly, and length of optical fiber between LPG and FBG fixed in 20 mm, more clearly reflection spectrum can be obtained. Experiment result shows a novel optical fiber sensor based on a concatenated strong fiber Bragg grating with a weak long period grating (CLBG) device can be used to monitor concentration and temperature simultaneously. The result of research has reference value in multi-parameter simultaneously sensing.

Strain/Temperature Discrimination Using Combined Fiber Bragg Grating and Long Period Grating Sensors

1996 ◽  
Author(s):  
H. Patrick ◽  
G. M. Williams ◽  
A. D. Kersey ◽  
J. R. Pedrazzani ◽  
A. M. Vengsarkar
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period

Fiber optic hot-wire flowmeter based on a metallic coated hybrid long period grating/fiber Bragg grating structure

2011 ◽  
Vol 50 (17) ◽  
pp. 2738 ◽  
Author(s):  
Paulo Caldas ◽  
Pedro A. S. Jorge ◽  
Gaspar Rego ◽  
Orlando Frazão ◽  
José Luís Santos ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Hot Wire ◽  
Long Period Grating ◽  
Grating Structure ◽  
Long Period
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