Investigation on the sensitivity of an etched graded-index multi-mode fiber to refractive index and temperature for mode-multiplexed fiber optic sensor applications

2021 ◽  
Author(s):  
L.S.M Alwis ◽  
K. Bremer ◽  
B. Roth
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Sensor Applications ◽  
Graded Index ◽  
Optic Sensor ◽  
Multi Mode

Fiber-optic sensor measuring spatial distributions of refractive index and temperature

2021 ◽  
Vol 60 (5) ◽  
pp. 1428
Author(s):  
Ivonne Pfalzgraf ◽  
Sergiy Suntsov ◽  
Detlef Kip
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Spatial Distributions ◽  
Optic Sensor

Sol-Gel and RF Sputtering Thin Film Coatings for Fiber Optic Sensor Applications

1991 ◽  
Vol 244 ◽  
Author(s):  
M. R. Shahriari ◽  
J. Y. Ding ◽  
C. M. Wang ◽  
C. H. Lin ◽  
G. H. Sigel
Keyword(s):  
Thin Film ◽  
Optical Waveguides ◽  
Fiber Optic ◽  
Sol Gel ◽  
Rf Sputtering ◽  
Silica Matrix ◽  
Hydrogen Gas ◽  
Fiber Optic Sensor ◽  
Sensor Applications ◽  
Optic Sensor

ABSTRACTThin film coating techniques appear to have many advantages over other techniques for immobilization and incorporation of chemical indicators to optical waveguides in developing dye based fiber optic chemical sensors. We have fabricated thin films of composites by using sol-gel and RF sputtering techniques. Different organic and inorganic indicators were immobilized in these films and incorporated into optical waveguides for sensor applications. A fiber optic pH sensor has been developed by introducing pH indicators into a silica matrix and coated as a thin film onto a porous glass fiber by a sol-gel technique. Also, a hydrogen gas fiber optic sensor has been developed by using a RF sputtered WO3/Pd coated porous optical fiber.

scholarly journals FIBER OPTIC SENSOR FOR THE MEASUREMENT OF CONCENTRATION AND REFRACTIVE INDEX OF LIQUIDS BASED ON INTENSITY MODULATION

2012 ◽  
Vol 06 ◽  
pp. 589-593 ◽  
Author(s):  
A.L. CHAUDHARI ◽  
A. D. SHALIGRAM
Keyword(s):  
Refractive Index ◽  
Ethylene Glycol ◽  
Output Power ◽  
Fiber Optic ◽  
Intensity Modulation ◽  
Fiber Optic Sensor ◽  
Refractive Indices ◽  
Fiber Probe ◽  
Optic Sensor ◽  
Index Changes

This paper reports the use of fiber optic sensor consists of two-fiber probe and reflector for the measurement of concentration and refractive index of liquids based on the reflective intensity modulation. Conventionally such a sensor is used for measuring micro-displacement of fiber tip with reference to the reflector. In one of the previously reported work we have established that if the separation between fiber tips and reflector is maintained constant the same arrangement can be directly used for sensing refractive index changes of medium. The liquid under test fills the gap between probe and reflector. Depending upon the refractive index of liquid, angle of emittance will change which will decide the received output power by receiving fiber. Apart from pure solvents which have different refractive indices, there are mixtures of various types which also alter the refractive index of a given medium. The developed sensor is used to detect the concentration of the alcohols like methanol & ethylene glycol in mixture with water.

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