A Novel Fiber-optic Soil Moisture Sensor Based on Total Internal Reflection of Light PDF Download

Author: Aisha B. Fields
Publisher:
ISBN:
Category : Optical fiber detectors
Languages : en
Pages : 106

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Author:
Publisher: Information Gatekeepers Inc
ISBN:
Category :
Languages : en
Pages : 12

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Author: Chu Zhu
Publisher:
ISBN:
Category : Chemical detectors
Languages : en
Pages : 594

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Author: Swee Chuan Tjin
Publisher: MDPI
ISBN: 3039366963
Category : Technology & Engineering
Languages : en
Pages : 256

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Book Description
This Special Issue focuses on all aspects of the recent research and development related to fiber optic sensors. The recent advances in fiber-based sensing technologies have enabled both fundamental studies and a wide spectrum of applications. The goal of this Special Issue is to bring attention to the most recent results in the field of fiber optic sensors, including new mechanisms, materials, processes, and applications.

Author:
Publisher: Information Gatekeepers Inc
ISBN:
Category :
Languages : en
Pages : 5

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Author: Vistasp M. Karbhari
Publisher: Elsevier
ISBN: 1845696824
Category : Technology & Engineering
Languages : en
Pages : 553

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Book Description
Structural health monitoring is an extremely important methodology in evaluating the 'health' of a structure by assessing the level of deterioration and remaining service life of civil infrastructure systems. This book reviews key developments in research, technologies and applications in this area of civil engineering. It discusses ways of obtaining and analysing data, sensor technologies and methods of sensing changes in structural performance characteristics. It also discusses data transmission and the application of both individual technologies and entire systems to bridges and buildings.With its distinguished editors and international team of contributors, Structural health monitoring of civil infrastructure systems is a valuable reference for students in civil and structural engineering programs as well as those studying sensors, data analysis and transmission at universities. It will also be an important source for practicing civil engineers and designers, engineers and researchers developing sensors, network systems and methods of data transmission and analysis, policy makers, inspectors and those responsible for the safety and service life of civil infrastructure. - Reviews key developments in research, technologies and applications - Discusses systems used to obtain and analyse data and sensor technologies - Assesses methods of sensing changes in structural performance

Author: Randolph Samuel Alessi
Publisher:
ISBN:
Category : Fiber optics
Languages : en
Pages : 192

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Author: Michael Iten
Publisher: vdf Hochschulverlag AG
ISBN: 3728134546
Category : Technology & Engineering
Languages : en
Pages : 270

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Author: Keonhag Lee
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Many properties of polymers can be affected by dissolving gases and supercritical fluids at high temperatures and pressures. Solubility and diffusivity are crucial parameters in polymer processing applications that indicates the content of gases and supercritical fluids in a polymer. Hence, different devices for measuring solubility and diffusivity have been researched, but most of the devices used today are very complex, expensive, and requires long experiment time. In this final thesis, the feasibility of fiber optic sensors as measurement devices for solubility and diffusivity of gas/SCF in polymers have been investigated. Many of the polymers used in polymer processing have high refractive index, from 1.40 to 1.60. However, most of the refractive index sensors based on fiber optics only operate in refractive index ranges of 1 to 1.44 because once the surrounding refractive index becomes greater than that of cladding, the total internal reflection is lost and only small portion of the light propagation occurs. This final thesis first reviews the current methods to measure solubility and diffusivity of gases and supercritical fluids in polymers. In addition, different types of fiber optics sensors used for sensing the refractive index are reviewed. Then, the thesis presents cost efficient, but effective fiber optic refractive index sensors, which are the silver nanoparticle coated LPG sensor, uncoated PCF MZI sensor, silver nanoparticle PCF MZI sensor, and the transmission intensity based gap sensor, to sense the surrounding refractive index in the region greater than the cladding, for the future application of solubility and diffusivity measurement. Moreover, future works that would help in sensing solubility and diffusivity of gas in polymers are also proposed.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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A method and apparatus for sensing moisture changes by utilizing optical fiber technology. One embodiment uses a reflective target at the end of an optical fiber. The reflectance of the target varies with its moisture content and can be detected by a remote unit at the opposite end of the fiber. A second embodiment utilizes changes in light loss along the fiber length. This can be attributed to changes in reflectance of cladding material as a function of its moisture content. It can also be affected by holes or inserts interposed in the cladding material and/or fiber. Changing light levels can also be coupled from one fiber to another in an assembly of fibers as a function of varying moisture content in their overlapping lengths of cladding material.