The Experts below are selected from a list of 27069 Experts worldwide ranked by ideXlab platform

Chuji Wang - One of the best experts on this subject based on the ideXlab platform.

  • Fiber Loop Ringdown — a Time-Domain Sensing Technique for Multi-Function Fiber Optic Sensor Platforms: Current Status and Design Perspectives
    Sensors, 2009
    Co-Authors: Chuji Wang
    Abstract:

    Fiber loop ringdown (FLRD) utilizes an inexpensive telecommunications light source, a photodiode, and a section of single-mode fiber to form a uniform fiber Optic Sensor platform for sensing various quantities, such as pressure, temperature, strain, refractive index, chemical species, biological cells, and small volume of fluids. In FLRD, Optical losses of a light pulse in a fiber loop induced by changes in a quantity are measured by the light decay time constants. FLRD measures time to detect a quantity; thus, FLRD is referred to as a time-domain sensing technique. FLRD Sensors have near real-time response, multi-pass enhanced high-sensitivity, and relatively low cost (i.e., without using an Optical spectral analyzer). During the last eight years since the introduction of the original form of fiber ringdown spectroscopy, there has been increasing interest in the FLRD technique in fiber Optic Sensor developments, and new application potential is being explored. This paper first discusses the challenging issues in development of multi-function, fiber Optic Sensors or Sensor networks using current fiber Optic Sensor sensing schemes, and then gives a review on current fiber Optic Sensor development using FLRD technique. Finally, design perspectives on new generation, multi-function, fiber Optic Sensor platforms using FLRD technique are particularly presented.

  • Fiber loop ringdown - A time-domain sensing technique for multi-function fiber Optic Sensor platforms: Current status and design perspectives
    Sensors, 2009
    Co-Authors: Chuji Wang
    Abstract:

    Fiber loop ringdown (FLRD) utilizes an inexpensive telecommunications light source, a photodiode, and a section of single-mode fiber to form a uniform fiber Optic Sensor platform for sensing various quantities, such as pressure, temperature, strain, refractive index, chemical species, biological cells, and small volume of fluids. In FLRD, Optical losses of a light pulse in a fiber loop induced by changes in a quantity are measured by the light decay time constants. FLRD measures time to detect a quantity; thus, FLRD is referred to as a time-domain sensing technique. FLRD Sensors have near real-time response, multi-pass enhanced high-sensitivity, and relatively low cost (i.e., without using an Optical spectral analyzer). During the last eight years since the introduction of the original form of fiber ringdown spectroscopy, there has been increasing interest in the FLRD technique in fiber Optic Sensor developments, and new application potential is being explored. This paper first discusses the challenging issues in development of multi-function, fiber Optic Sensors or Sensor networks using current fiber Optic Sensor sensing schemes, and then gives a review on current fiber Optic Sensor development using FLRD technique. Finally, design perspectives on new generation, multi-function, fiber Optic Sensor platforms using FLRD technique are particularly presented.

Banshi Dhar Gupta - One of the best experts on this subject based on the ideXlab platform.

  • surface plasmon resonance based fiber Optic Sensor for the ir region using a conducting metal oxide film
    Journal of The Optical Society of America A-optics Image Science and Vision, 2010
    Co-Authors: Banshi Dhar Gupta
    Abstract:

    Theoretical modeling of a surface plasmon resonance (SPR) based fiber Optic Sensor with a conducting metal oxide [indium tin oxide (ITO)] as the SPR active material is proposed. The theoretical analysis reveals that the proposed sensing probe can be utilized for sensing in the IR region, where most of the gases show their absorption regime. Comparison of sensitivity predicts that an ITO-layer-coated SPR-based fiber Optic Sensor is about 60% more sensitive than a gold-coated fiber Optic Sensor. The physical reasons behind sensitivity enhancement are provided. Apart from this, various advantageous features of the ITO over the noble metals, silver and gold, are addressed.

  • surface plasmon resonance based tapered fiber Optic Sensor with different taper profiles
    Optics Communications, 2008
    Co-Authors: Rajneesh K. Verma, Anuj K Sharma, Banshi Dhar Gupta
    Abstract:

    Abstract A theoretical model for surface plasmon resonance (SPR) based tapered fiber Optic Sensor is proposed with three different taper profiles, namely, linear, parabolic, and exponential-linear. The effect of taper ratio and taper profiles on the Sensor’s performance is studied in detail and the design considerations for significantly enhanced sensitivity are reported. The study shows that the exponential-linear taper profile with high taper ratio provides the best performance. The physical reasons behind sensitivity enhancement due to taper ratio and taper profile are given, wherever required.

  • Surface plasmon resonance-based tapered fiber Optic Sensor: Sensitivity enhancement by introducing a teflon layer between core and metal layer
    Plasmonics, 2008
    Co-Authors: Rajan Jha, Rajneesh K. Verma, Banshi Dhar Gupta
    Abstract:

    Surface plasmon resonance (SPR)-based tapered fiber Optic Sensor with Teflon as a dielectric sandwiched between metal and tapered fiber core is proposed. The sensitivity of the Sensor has been maximized using different combinations of metal and Teflon layer thicknesses for a given taper ratio. The study shows that the sensitivity of the Sensor with the introduction of dielectric (Teflon) increases with the increase in the taper ratio. The maximum sensitivity achieved for a given taper ratio is around 15 times higher than the general SPR-based fiber Optic Sensor.

Rajneesh K. Verma - One of the best experts on this subject based on the ideXlab platform.

Rajan Jha - One of the best experts on this subject based on the ideXlab platform.

Manuel Lopez-amo - One of the best experts on this subject based on the ideXlab platform.

  • Fiber Optic Sensor configurations
    PHOTOPTICS 2015 - 3rd International Conference on Photonics, Optics and Laser Technology, Proceedings, 2015
    Co-Authors: Rosa Ana Perez-herrera, Manuel Lopez-amo
    Abstract:

    The main goal of this work is to provide a brief overview of the fiber Optic Sensor multiplexing configurations and techniques as well as some recent advances and trends of the most important fiber Optic Sensor configurations. Distributed and point Sensors are explained and a number of high performance networks are shown. Finally, the concept of robust fiber Optic Sensor is presented as well as the main records of distributed and remote sensing fiber Optics topologies.

  • Fiber Optic Sensor networks
    Optical Fiber Technology, 2013
    Co-Authors: Rosa Ana Perez-herrera, Manuel Lopez-amo
    Abstract:

    Abstract One of the main goals in fiber Optic Sensor technology is to multiplex together a high number of Sensors in the same network in order to share expensive terminal equipment and develop a system including multiple measuring points. Different kind of multiplexing networks for fiber Optic Sensors will be described and compared here, including networks using Optical amplification and lasing multiplexing systems. State of the art in multiplexed and distributed Sensor networks is also shown, focused on robust, remote and distributed Brillouin networks.

  • Concrete Beam Bending Test Monitorization Using a High Strain Fiber Optic Sensor
    Journal of Lightwave Technology, 2012
    Co-Authors: Mikel Bravo, M Bravo-Navas, Julia Saenz, Manuel Lopez-amo
    Abstract:

    In this work the development of an "eight-shape" fiber Optic Sensor for high strain measurement is experimentally demonstrated. This strain Sensor is interrogated using a commercial Optical time domain reflectometer through a dual configuration that is able to measure backscattering and the transmission of an intensity pulse while reducing unwanted cladding-mode coupling effects. An 'in field' concrete beam bending test was also performed in order to compare the proposed intensity bending Sensor with the mature fiber Bragg grating technology.