Journal ArticleDOI
Compact fiber-optic curvature sensor based on super-mode interference in a seven-core fiber.
G. Salceda-Delgado,A. Van Newkirk,Jose Enrique Antonio-Lopez,Alejandro Martinez-Rios,Axel Schülzgen,R. Amezcua Correa +5 more
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TLDR
A compact, low loss, and highly sensitive optical fiber curvature sensor is presented, which allows for using either visibility or spectral shift for sensor interrogation when the device is bent.Abstract:
A compact, low loss, and highly sensitive optical fiber curvature sensor is presented. The device consists of a few-millimeter-long piece of seven-core fiber spliced between two single-mode fibers. When the optical fiber device is kept straight, a pronounced interference pattern appears in the transmission spectrum. However, when the device is bent, a spectral shift of the interference pattern is produced, and the visibility of the interference notches changes. This allows for using either visibility or spectral shift for sensor interrogation. The dynamic range of the device can be tailored through the proper selection of the length of the seven-core fiber. The effects of temperature and refractive index of the external medium on the response of the curvature sensor are also discussed. Linear sensitivity of about 3000 nm/mm−1 for bending was observed experimentally.read more
Citations
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Fiber-Optic Sensor for Directional Bending Monitoring Based on a Pattern Recognition Algorithm
Rodolfo Martinez-Manuel,Jonathan Esquivel-Hernandez,Luis M. Valentin-Coronado,Sophie LaRochelle +3 more
TL;DR: In this paper , a fiber sensor for directional bending monitoring is presented, which is made of a single piece of a multimode elliptical core fiber and works in a reflection regime.
A Highly Sensitive Curvature Sensor Based on Omega-Shaped Long-Period Fiber Grating
TL;DR: In this article , a compact omega-shaped long-period fiber grating (OS-LPFG) for vector bending measurement is proposed and investigated, which is fabricated by periodically splicing singlemode fiber (SMF) and multimode fiber (MMF) into omega shape to get the purpose of sensitivity enhancement.
Journal ArticleDOI
Feature Extraction Enabled Deep Learning From Specklegram for Optical Fiber Curvature Sensing
TL;DR: This approach has significantly better prediction ability and robustness than the traditional approach, which processes the specklegram image directly using a two-dimensional convolutional neural network (2D CNN) for sensing.
Journal ArticleDOI
Supermode Bragg grating inscribed in a strongly coupled seven-core fiber and its responses to temperature and curvature.
TL;DR: In this article , a Bragg grating is successfully inscribed in a piece of strongly coupled seven-core fiber (SCF), and two separate Bragg resonance notches are observed in the transmission spectrum, corresponding to backward coupling of HE11-like and HE12-like supermodes of the SCF.
Journal ArticleDOI
Fiber-Optic Sensor for Directional Bending Monitoring Based on a Pattern Recognition Algorithm
TL;DR: In this paper , a fiber sensor for directional bending monitoring is presented, which is made of a single piece of a multimode elliptical core fiber and works in a reflection regime.
References
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Journal ArticleDOI
Curvature loss formula for optical fibers
TL;DR: In this article, the curvature loss for optical fibers with constant radius of curvature of their axes is derived by expressing the field outside of the fiber in terms of a superposition of cylindrical outgoing waves.
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Refractometry based on a photonic crystal fiber interferometer
TL;DR: A simple and compact modal interferometer for applications in refractometry that is highly stable over time, has low temperature sensitivity, and is suitable for measuring indices in the 1.330-1.440 range is reported.
Journal ArticleDOI
Single-Mode Fiber Refractive Index Sensor Based on Core-Offset Attenuators
TL;DR: In this paper, a fiber Michelson interferometer refractive index (RI) sensor with a single core-offset attenuator and a layer of ~ 500-nm gold coating was demonstrated.
Journal ArticleDOI
Optical bend sensor based on measurement of resonance mode splitting of long-period fiber grating
TL;DR: In this article, an effective method of realizing optical bend sensing based on the measurement of bending-curvature encoded resonance mode splitting of long-period fiber grating was proposed.
Journal ArticleDOI
Multicore fiber sensor for high-temperature applications up to 1000°C
J. Enrique Antonio-Lopez,Zeinab Sanjabi Eznaveh,Patrick LiKamWa,Axel Schülzgen,Rodrigo Amezcua-Correa +4 more
TL;DR: A novel high temperature sensor based on customized multicore fiber (MCF) spliced between two standard single-mode fibers is proposed and experimentally demonstrated, enabling temperature measurements with high sensitivity and accuracy.