Structural health monitoring of innovative bridges in Canada with fiber optic sensors

Tennyson, R. C.; Mufti, Aftab A.; Rizkalla, Sami; Tadros, Gamil; Benmokrane, Brahim

doi:10.1088/0964-1726/10/3/320

Cited by 204 publications

(133 citation statements)

References 3 publications

(2 reference statements)

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“…For SHM where the potential damage or leakage locations are unknown, it is difficult to pre-determine the places to install FBG sensors but they are excellent in localizing the damage only when the specific area(s) of interest are known. They can be applicable in aerospace and civil industry including bridges, buildings, and dams [46][47] for measurement of dynamic strain, temperature, wind or water pressure, and damage location [48][49]. In fact in civil engineering Indus-try, FBG based strain sensors have been proven to be attractive alternatives to the conventional electrical strain gauges [50].…”

Section: Spectrometric or Quasi-distributed Fiber Sensorsmentioning

confidence: 99%

Review on Developments in Fiber Optical Sensors and Applications

Annamdas¹

2012

IJME

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The last couple of decades had witnessed a steep rise in extensive research of optoelectronic and fiber optical communication fields, which resulted in applications focused initially in military, aerospace equipments, and later in health monitoring for medicine, heritage culture and various engineering fields. Health monitoring has attracted the effort of many engineers throughout the world and is fast emerging as a pioneering field. It is helping to improve world economy in two ways; first, directly by providing longevity to all the important structures and secondly, by prevention of untimely failure leading to loss of life and money. This field is very vast, consisting of traditional monitoring methods as well as smart system based methods. The fiber optics belong to finest class of smart materials, there are many types and classifications of fiber optics based on necessity, manufacturer and the end user. This paper, gives a complete over view of fiber sensing systems and their usefulness. In addition, it highlights some of the general fiber optics available in the market with selected examples.

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Section: Spectrometric or Quasi-distributed Fiber Sensorsmentioning

confidence: 99%

Review on Developments in Fiber Optical Sensors and Applications

Annamdas¹

2012

IJME

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“…Some have been in use for a relatively long time, such as electrical resistance strain gauges, and others are emerging, such as electromagnetic sensors that can directly measure the stress in a steel cable. Fiber optic sensors have caught the interest of researchers in SHM due to their insusceptibility to electromagnetic and radio frequency interference (Tennyson et al 2001) and since they are moderately durable when embedded in concrete (Fuhr et al 1999). Vibrating wire strain gauges have also been used for long-term, low-frequency measurements.…”

Section: Sensors Available For Structural Health Monitoringmentioning

confidence: 99%

Development of a structural health monitoring system for the life assessment of critical transportation infrastructure.

Roach¹,

Jáuregui

Daumueller

2012

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Recent structural failures such as the I-35W Mississippi River Bridge in Minnesota have underscored the urgent need for improved methods and procedures for evaluating our aging transportation infrastructure. This research seeks to develop a basis for a Structural Health Monitoring (SHM) system to provide quantitative information related to the structural integrity of metallic structures to make appropriate management decisions and ensuring public safety.This research employs advanced structural analysis and nondestructive testing (NDT) methods for an accurate fatigue analysis. Metal railroad bridges in New Mexico will be the focus since many of these structures are over 100 years old and classified as fracture-critical. The term fracture-critical indicates that failure of a single component may result in complete collapse of 4 the structure such as the one experienced by the I-35W Bridge. Failure may originate from sources such as loss of section due to corrosion or cracking caused by fatigue loading. Because standard inspection practice is primarily visual, these types of defects can go undetected due to oversight, lack of access to critical areas, or, in riveted members, hidden defects that are beneath fasteners or connection angles. Another issue is that it is difficult to determine the fatigue damage that a structure has experienced and the rate at which damage is accumulating due to uncertain history and load distribution in supporting members. A SHM system has several advantages that can overcome these limitations. SHM allows critical areas of the structure to be monitored more quantitatively under actual loading. The research needed to apply SHM to metallic structures was performed and a case study was carried out to show the potential of SHM-driven fatigue evaluation to assess the condition of critical transportation infrastructure and to guide inspectors to potential problem areas. This project combines the expertise in transportation infrastructure at New Mexico State University with the expertise at Sandia National Laboratories in the emerging field of SHM.5

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“…These attributes have led to the successful application of optical fiber sensors in structural monitoring and machine control. 1,2 Fiber grating-based sensors, including fiber Bragg gratings (FBGs), [3][4][5] long period fiber gratings (LPFGs), 6,7 and tilted fiber Bragg gratings (TFBG), 8 have been employed as displacement measurement devices, either by direct stretch, the use of cantilever beams and similar structures, or perpendicular displacement to the sensors. Unfortunately, the abovementioned displacement sensing technologies have a major limitation that the measurement dynamic range is restricted due to the glass nature of optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed displacement fiber sensor using thin core fiber exciter

Chen

Hefferman

Wei

2015

Review of Scientific Instruments

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. (2015). Multiplexed displacement fiber sensor using thin core fiber exciter. This letter reports a multiplexed optical displacement sensor using a thin core fiber (TCF) exciter. The TCF exciter is followed by a stripped single mode optical fiber. A small section of buffer is used as the movable component along the single mode fiber. Ultra-weak cladding mode reflection (<−75 dB) was employed to probe the refractive index discontinuity between the air and buffer coating boundary. The position change of the movable buffer segment results in a delay change of the cladding mode reflection. Thus, it is a measure of the displacement of the buffer segment with respect to the glass fiber. The insertion loss of one sensor was measured to be less than 3 dB. A linear relationship was evaluated between the measurement position and absolute position of the moving actuator. Multiplexed capability was demonstrated and no cross talk was found between the sensors. C 2015 AIP Publishing LLC.[http://dx

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Structural health monitoring of innovative bridges in Canada with fiber optic sensors

Cited by 204 publications

References 3 publications

Review on Developments in Fiber Optical Sensors and Applications

Review on Developments in Fiber Optical Sensors and Applications

Development of a structural health monitoring system for the life assessment of critical transportation infrastructure.

Multiplexed displacement fiber sensor using thin core fiber exciter

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