Fiber optic bending loss sensor for application on monitoring of embankment dams

Ribeiro, Luiz A. de S.; Rosolem, J.B.; Dini, Danilo; Floridia, Claudio; Hortencio, Claudio A.; Costa, Eduardo F.; Bezerra, E. W.; Oliveira, Rinaldo B. de; Loichate, Marcelo D.; Durelli, Anderson S.

doi:10.1109/imoc.2011.6169273

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…This approach, yet mediated by proper transducing mechanisms, has also been explored in single-point [64,65] and quasi-distributed sensors [66,67], but the most noticeable example of this class in distributed pressure sensing has been proposed by Zhou et al [68], and consists of an optical fiber with soft cladding, made of silicone rubber, and a lowabsorption silica core. The thickness and the refraction index of the cladding change significantly under pressure, leading to increased transmission losses.…”

Section: Measurement Of Pressure-induced Losses In Special Optical Fibersmentioning

confidence: 99%

Distributed optical fiber pressure sensors

Schenato

Galtarossa

Pasuto

et al. 2020

Optical Fiber Technology

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The measurement of pressure by using distributed optical fiber sensors has represented a challenge for many years. While single-point optical fiber pressure sensors have reached a solid level of technology maturity, showing to be very good candidates in replacing conventional electrical sensors due to their numerous advantages, distributed sensors are still a matter of an intense research activity aimed at determining the most proper and robust pressure-sensitivity enhancement mechanism. This paper reviews early and recent works on distributed pressure sensors, classifying the sensors according to the sensing mechanism. For each type of mechanism, the issues and potentials are analyzed and discussed.

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Section: Measurement Of Pressure-induced Losses In Special Optical Fibersmentioning

confidence: 99%

Distributed optical fiber pressure sensors

Schenato

Galtarossa

Pasuto

et al. 2020

Optical Fiber Technology

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“…In the quasi-distributed OFS network, the multiplexing allows a single interrogation system (i.e., a single optical source and a single detector) to support multiple SUs, enhancing the system performance, as well as the practicability (in terms of install and operation costs/efforts) [14,30]. As summarized in Table 2, various multiplexing techniques have been proposed for the OFS network with discrete SUs [31][32][33][34][35][36][37][38][39][40][41][42][43]. The multiplexing techniques can be categorized into (a) wavelength division multiplexing (WDM), (b) time division multiplexing (TDM), (c) coherence division multiplexing (CDM), and (d) space division multiplexing (SDM), as shown in Figure 3.…”

Section: Multiplexing Techniques For the Quasi-distributed Optical Fiber Sensor Networkmentioning

confidence: 99%

Multiplexed Passive Optical Fiber Sensor Networks for Water Level Monitoring: A Review

Lee

Choo

Kim

2020

Sensors

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Water management is a critical mission required to protect the water resources that is essential in diverse industrial applications. Amongst a variety of parameters such as level (or depth), temperature, conductivity, turbidity, and pH, the water level is the most fundamental one that needs to be monitored on a real-time basis for securing the water management system. This paper presents an overview of water level monitoring technologies based on optical fiber sensor (OFS) networks. Firstly, we introduce and compare the passive distributed and quasi-distributed (discrete) sensor networks with the recent achievements summarized. The performance (i.e., sensing range and resolution) of the OFS networks can be enhanced through diverse multiplexing techniques based on wavelength, time, coherence, space, etc. Especially, the dense wavelength division multiplexing (DWDM)-based sensor network provides remote sensing (where its reach can be extended to >40 km) with high scalability in terms of the channel number that determines the spatial resolution. We review the operation principle and characteristics of the DWDM-based OFS network with full theoretical and experimental analysis being provided. Furthermore, the key system functions and considerations (such as the link protection from physical damages, self-referencing, management of sensing units, and so on) are discussed that could be a guideline on the design process of the passive OFS network.

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“…Other minor applications are not considered in this review. Similarly, the paper includes neither approaches where distributed techniques are used only to interrogate concatenations of single point sensors [2,3] nor transducers inducing losses at discrete points along the fibre (e.g., employing bending) [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

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Fiber optic bending loss sensor for application on monitoring of embankment dams

Cited by 9 publications

References 9 publications

Distributed optical fiber pressure sensors

Distributed optical fiber pressure sensors

Multiplexed Passive Optical Fiber Sensor Networks for Water Level Monitoring: A Review

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

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