Dr. Jianming Yuan Profile

Dr. Jianming Yuan

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Publications (6)

Proceedings Article | 8 March 2004 Paper

Characterization of integrated fiber optic sensors in smart textiles

Jianming Yuan, Mahmoud El-Sherif, Saif Khalil, James Fairneny

Proceedings Volume 5272, (2004) https://doi.org/10.1117/12.515025

KEYWORDS: Fiber optics sensors, Optical fibers, Multimode fibers, Silica, Structural sensing, Modulation, Integrated optics, Sensors

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Proceedings Article | 4 March 2004 Paper

Development of smart textiles with embedded fiber optic chemical sensors

Saif Khalil, Jianming Yuan, Mahmoud El-Sherif

Proceedings Volume 5270, (2004) https://doi.org/10.1117/12.515068

KEYWORDS: Optical fibers, Fiber optics sensors, Fiber optics, Cladding, Chemical fiber sensors, Sensors, Signal processing, Environmental sensing, Coating, Signal attenuation

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Proceedings Article | 26 February 2001 Paper

Fiber optic chemical sensors using a modified conducting polymer cladding

Jianming Yuan, Mahmoud El-Sherif, Alan MacDiarmid, Wayne Jones

Proceedings Volume 4205, (2001) https://doi.org/10.1117/12.417447

KEYWORDS: Cladding, Polymers, Sensors, Optical fibers, Fiber optics sensors, Polymer optical fibers, Chemical elements, Absorption, Polymeric sensors, Optical components

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Proceedings Article | 11 January 1999 Paper

Development of on-fiber optical sensors utilizing chromogenic materials

Jianming Yuan, Mahmoud El-Sherif

Proceedings Volume 3538, (1999) https://doi.org/10.1117/12.335755

KEYWORDS: Cladding, Sensors, Optical fibers, Refractive index, Ultraviolet radiation, Optical sensors, Fiber optics sensors, Temperature sensors, Etching, Absorption

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On-fiber optical sensors, designed with chromogenic materials used as the fiber modified cladding, were developed for sensing environmental conditions. The design was based on the previously developed on-fiber devices. It is known that the light propagation characteristics in optical fibers are strongly influenced by the refractive index of the cladding materials. Thus, the idea of the on- fiber devices is based on replacing the passive optical fiber cladding with active or sensitive materials. For example, temperature sensors can be developed by replacing the fiber clad material with thermochromic materials. In this paper, segmented polyurethane-diacetylene copolymer (SPU), was selected as the thermochromic material for temperature sensors applications. This material has unique chromogenic properties as well as the required mechanical behaviors. During UV exposure and heat treatment, the color of the SPU copolymer varies with its refractive index. The boundary condition between core and cladding changes due to the change of the refractive index of the modified cladding material. The method used for the sensor development presented involves three steps: (a) removing the fiber jacket and cladding from a small region, (b) coating the chromogenic materials onto the modified region, and (c) integrating the optical fiber sensor components. The experimental set-up was established to detect the changes of the output signal based on the temperature variations. For the sensor evaluation, real-time measurements were performed under different heating-cooling cycles. Abrupt irreversible changes of the sensor output power were detected during the first heating-cooling cycle. At the same time, color changes of the SPU copolymer were observed in the modified region of the optical fiber. For the next heating-cooling cycles, however, the observed changes were almost completely reversible. This result demonstrates that a low-temperature sensor can be built by utilizing the chromogenic SPU copolymer as the modified cladding material.

Proceedings Article | 15 November 1996 Paper

NDE technique for ceramic composites using embedded sapphire optical waveguides

Mahmoud El-Sherif, Jianming Yuan

Proceedings Volume 2944, (1996) https://doi.org/10.1117/12.259054

KEYWORDS: Optical fibers, Sapphire, Composites, Ceramics, Modulation, Multimode fibers, Waveguides, Cladding, Nondestructive evaluation, Coating

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