Optical fibre sensors for earth sciences:

Brambilla, Gilberto; Kee, H.H.; Pruneri, Valerio; Newson, T.P.

doi:10.1016/s0143-8166(01)00096-3

Cited by 15 publications

(6 citation statements)

References 34 publications

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“…The fluorotellurite glasses studied in this work presents the following chemical composition (in mol%): 85TeO 2 3 , respectively. About 5 g batches of the starting materials were mixed and fully melted in a platinum crucible at 1083 K for 15 min in an electric furnace using air atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…Particularly, the glasses offer advantages in comparison with other hosts, owing to lower costs and simpler methods of preparation. For this reason, the optical characterization of glasses doped with RE 3+ ions have been extensively investigated due to their multiple applications, including optical amplifiers, upconverters and laser applications [1][2][3]. Among the common requirements that must fulfill the glasses hosts highlight wide transmission ranges from ultraviolet (UV) to mid-infrared (IR), good chemical, mechanical and thermal stabilities, high nonlinear refractive index, and relatively low-energy phonon, which reduce the multiphonon non-radiative probabilities and, consequently, increase the quantum yields.…”

Section: Introductionmentioning

confidence: 99%

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Nd3+-doped TeO2–PbF2–AlF3 glasses for laser applications

et al. 2016

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a b s t r a c tA study of the optical properties of Nd 3+ ion in TeO 2 -PbF 2 -AlF 3 glasses has been carried out for different Nd 3+ concentrations. Based on the Judd-Ofelt theory, intensity parameters and radiative properties were determined from the absorption spectra. Focusing on the suitability of this host for laser applications, the spectroscopic quality factor v was obtained with a value of 1.07, a value of the order of other compositions proposed as laser hosts. For the most intense emission corresponding with the 4 F 3/2 ? 4 I 11/2 transition (1.06 lm), the absorption and emission and have been calculated with values of 1.20 Â 10 À20 cm 2 , 2.08 Â 10 À20 cm 2 . A positive value for the gain cross-sections has been found for a population inversion factor c of 0.4 in the spectral range from 1060 to 1110 nm. All these results suggest the potentially use of this system as a laser host.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nd3+-doped TeO2–PbF2–AlF3 glasses for laser applications

et al. 2016

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“…This characteristic makes possible the application of LPG sensors in petroleum and natural gas fields 13 and for environment control 14 . The LPG is an axially periodic modulation in the optical fiber refractive index with periods of 100-700 μm, which couples light from the fundamental core propagation mode to co-propagating cladding modes.…”

Section: Introductionmentioning

confidence: 99%

Alternative technique for biodiesel quality control using an optical fiber long-period grating sensor

Falate¹,

Nike

Neto

et al. 2007

Quím. Nova

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Recebido em 12/12/06; aceito em 15/3/07; publicado na web em 17/7/07Alternative Technique for Biodiesel Quality Control Using an Optical Fiber Long-Period Grating Sensor. We report the use of an optical fiber sensor to measure the soybean oil concentration in samples obtained from the mixture of pure biodiesel and commercial soybean oil. The operation of the device is based on the long-period grating sensitivity to the surrounding medium refractive index, which leads to measurable modifications in the grating transmission spectrum. The proposed analysis method results in errors in the oil concentration of 0.4% and 2.6% for pure biodiesel and commercial soybean oil, respectively. Techniques of total glycerol, dynamic viscosity, density, and hydrogen nuclear magnetic resonance spectroscopy were also employed to validate the proposed method.

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“…The FBG results were in good agreement with those from conventional resistive probes. Brambilla et al pointed out that gratings written in tin-doped silica fibers exhibited great thermal stability up to about 800 °C, surpassing those written in borogermanosilicate, germanosilicate or hydrogen loaded telecom fibers, which were potentially suitable for high temperature applications such as in volcanic areas [44]. …”

Section: Development Of Fbg-based Geohazard Monitoring Systemsmentioning

confidence: 99%

FBG-Based Monitoring of Geohazards: Current Status and Trends

Zhu

Shi

Zhang

2017

Sensors

119

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In recent years, natural and anthropogenic geohazards have occured frequently all over the world, and field monitoring is becoming an increasingly important task to mitigate these risks. However, conventional geotechnical instrumentations for monitoring geohazards have a number of weaknesses, such as low accuracy, poor durability, and high sensitivity to environmental interferences. In this aspect, fiber Bragg grating (FBG), as a popular fiber optic sensing technology, has gained an explosive amount of attention. Based on this technology, quasi-distributed sensing systems have been established to perform real-time monitoring and early warning of landslides, debris flows, land subsidence, earth fissures and so on. In this paper, the recent research and development activities of applying FBG systems to monitor different types of geohazards, especially those triggered by human activities, are critically reviewed. The working principles of newly developed FBG sensors are briefly introduced, and their features are summarized. This is followed by a discussion of recent case studies and lessons learned, and some critical problems associated with field implementation of FBG-based monitoring systems. Finally the challenges and future trends in this research area are presented.

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Optical fibre sensors for earth sciences:

Cited by 15 publications

References 34 publications

Nd3+-doped TeO2–PbF2–AlF3 glasses for laser applications

Nd3+-doped TeO2–PbF2–AlF3 glasses for laser applications

Alternative technique for biodiesel quality control using an optical fiber long-period grating sensor

FBG-Based Monitoring of Geohazards: Current Status and Trends

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