Stress optical fiber sensor using light coupling between two laterally fused multimode optical fibers

Rachid Gafsi; Pierre Lecoy; Abdelrafik Malki

doi:10.1364/AO.37.003417

Applied Optics
Vol. 37,
Issue 16,
pp. 3417-3425
(1998)
•https://doi.org/10.1364/AO.37.003417

Stress optical fiber sensor using light coupling between two laterally fused multimode optical fibers

Rachid Gafsi, Pierre Lecoy, and Abdelrafik Malki

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Rachid Gafsi, Pierre Lecoy, and Abdelrafik Malki, "Stress optical fiber sensor using light coupling between two laterally fused multimode optical fibers," Appl. Opt. 37, 3417-3425 (1998)

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Abstract

A stress optical fiber sensor was manufactured and tested. It uses light coupling between two parallel and laterally fused, all-silica multimode optical fibers along a cladding length of a few centimeters. This sensor is dedicated to the measurement of high values of stress. A theoretical model was developed using the mode coupling and the perturbation theory to calculate the global coupling coefficient of light. A serial optical fiber sensor network interrogated by the time-division multiplexing method was realized and tested. The major applications of this sensor are control and monitoring of civil engineering structures and concretes.

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Equations (18)

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f (Dimensionless)	\|κ\| (Dimensionless)	\|C\|(m^-1)
0.40	4.336 × 10^-19	1.892 × 10^-15
0.38	1.621 × 10^-19	6.840 × 10^-16
0.35	3.772 × 10^-20	1.591 × 10^-16
0.32	8.947 × 10^-21	3.775 × 10^-17
0.30	3.464 × 10^-21	1,460 × 10^-17
0.28	1.351 × 10^-21	5.701 × 10^-18
0.25	3.40 × 10^-22	1.409 × 10^-18
0.22	8.389 × 10^-23	3.540 × 10^-19
0.20	3.368 × 10^-23	1.421 × 10^-19
0.15	3.538 × 10^-24	1.493 × 10^-20
0.10	4.356 × 10^-26	1.838 × 10^-21
0	5.078 × 10^-27	2.142 × 10^-23

f (Dimensionless)	\|κ\| (Dimensionless)	\|C\|(m^-1)
0.40	5.951 × 10^-15	2.009 × 10^-11
0.38	2.086 × 10^-15	7.042 × 10^-12
0.35	4.456 × 10^-16	1.504 × 10^-12
0.32	9.831 × 10^-17	3.318 × 10^-13
0.30	3.652 × 10^-17	1.232 × 10^-14
0.28	1.374 × 10^-17	4.638 × 10^-14
0.25	3.249 × 10^-18	1.096 × 10^-14
0.22	7.890 × 10^-19	2.663 × 10^-15
0.20	3.115 × 10^-19	1.051 × 10^-15
0.15	3.199 × 10^-20	1.079 × 10^-16
0.10	3.499 × 10^-21	1.181 × 10^-17
0	4.968 × 10^-23	1.677 × 10^-19

f (Dimensionless)	\|κ\| (Dimensionless)
0.25	3.249 × 10^-1
0.20	1.653 × 10^-2
0.15	1.263 × 10^-4
0.10	1.042 × 10^-8
0.05	9.251 × 10^-12
0	2.939 × 10^-17

f (Dimensionless)	\|κ\| (Dimensionless)	\|C\|(m^-1)
0.35	2.85 × 10^-1	1168
0.30	7.62 × 10^-2	312.38
0.25	2.51 × 10^-2	102.81
0.20	7.56 × 10^-4	3.10

f (Dimensionless)	Sensitivity along y-Axis Compression (MPa^-1) (× 10^-3)	Sensitivity along x-Axis Compression (MPa^-1) (× 10^-3)
0.35	6	2.215
0.30	6.400	2.402
0.25	6.500	2.600
0.20	6.532	2.672

Fiber Type (μm)	Fusion Degree (f) (±0.05)	L _f (mm) (±1)	Sensitivity along y-Axis Compression (MPa^-1) (× 10^-3)	Sensitivity along x-Axis Compression (MPa^-1)
(62.5–125)	0.25	15	6.149	1.123 × 10^-3
(62.5–125)	0.25	10	3.978	9.444 × 10^-4
(50–125)	0.34	10	1.371	—
(62.5–125)	0.19	10	7.371	—

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Equations (18)

Applied Optics