Low-coherence deformation sensors for the monitoring of civil-engineering structures

Inaudi, Daniele; Elamari, A.; Pflug, Léopold; Gisin, Nicolas; Breguet, J.; Vurpillot, Samuel

doi:10.1016/0924-4247(94)00797-7

Cited by 115 publications

(39 citation statements)

References 2 publications

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“…The new approach differs from previously demonstrated multiplexing schemes [2][3][4][5][6][7][8][9] in that only a cavity-length adjustable fiber-optic ring resonator is needed to generate differential optical paths to match the sensing gauges. In the sensor array, only a single fiber lead supplies both input and output signals, which is advantageous because it greatly reduces the complexity and cost of a low-coherence interferometric multiplexed sensor array.…”

Section: Introductionmentioning

confidence: 94%

“…[1][2][3][4][5][6][7][8][9] An advantage of this approach compared with using conventional interferometric sensors is well known, in that it can be used to determine a quasi-static measurement such as temperature, pressure, and strain with a corresponding displacement range much larger than one wavelength. Another advantage is that many sensors can be coherently multiplexed onto a single optical signal without the need for relatively complex time or frequency multiplexing techniques.…”

Section: Introductionmentioning

confidence: 99%

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Low-coherence Michelson interferometric fiber-optic multiplexed strain sensor array: a minimum configuration

et al. 2004

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A minimum configuration Michelson fiber-optic low-coherence interferometric quasi-distributed sensing system is proposed that permits absolute length measurement in remote reflective sensor arrays. The sensor's reflective signal characteristics have been analyzed, and the relationship between intensities of light and number of sensors is given for evaluation of multiplexing potential. The proposed sensing scheme will be useful for the measurement of strain distribution. An important application may be strain monitoring in smart structures. Experimentally, four-sensor array has been demonstrated.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Low-coherence Michelson interferometric fiber-optic multiplexed strain sensor array: a minimum configuration

et al. 2004

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“…The SOFO (Surveillance d'Ouvrage par Fibre Optique) system is based on low coherence interferometry in standard optical fibres that are used in telecommunication (Inaudi et al 1994). The system measures small deformations and provides a resolution of approximately 2 microns.…”

Section: Fibre Optic Sensors (Sofo)mentioning

confidence: 99%

Model Identification of Bridges Using Measurement Data

Robert-Nicoud¹,

Raphael²,

Burdet³

et al. 2005

Computer aided Civil Eng

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Measurements are increasingly used to augment traditional assessments of structural state. Measurements of deflections, rotations and strain provide indications of damages as well as changes in the values of parameters such as Young's modulus. Finite element model updating methods have been developed in the 1990s for identifying structural state from measurements. Currently most methods aim to determine the values of stiffness coefficients that result in measured responses. In the present work, a model calibration method identifies causes of structural behaviour such as support conditions and material properties. Static measurement data is employed for model calibration. A case study of the Lutrive bridge in Switzerland illustrates the methodology. Candidate models whose responses reasonably match measured data are identified. These models are then examined in order to determine whether the calibrated values are physically possible. Such examinations lead to either model rejection or further measurements.

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“…1 Recent advances in measurement technology have demonstrated that fiber optic sensors are suitable for the monitoring of full-scale civil structures. 2 When installed on structures, these sensors allow for monitoring important parameters such as deformations, temperatures, pH values, and gas concentrations. Given the exceptional stability and the flexibility with which large structures can be instrumented with an optical fiber sensing network, 3,4 it can be reasonably expected that optical fiber sensors will become the backbone of measurement systems dedicated to monitoring the state of the infrastructure worldwide.…”

Section: Introductionmentioning

confidence: 99%

Measurement of dynamic deformations using a path-unbalance Michelson-interferometer-based optical fiber sensing device

LLoret

Rastogi

Thévenaz³

et al. 2003

Opt. Eng

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Abstract.A novel demodulation technique for performing dynamic deformation measurements using a path-unbalanced Michelson interferometer is reported. The method is based on the rf amplitude modulation of a low-coherence source, and demodulation is achieved by tracking in the frequency domain the position of the minimum of the detected intensity. This technique is particularly suitable for deformation measurements in civil engineering structures where deformations of the order of few millimeters over the sensor length are expected. The method features a measurement range of at least 10 mm, sensitivity better than 10 m, and dynamic deformation measurements with a bandwidth up to 100 Hz.

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Low-coherence deformation sensors for the monitoring of civil-engineering structures

Cited by 115 publications

References 2 publications

Low-coherence Michelson interferometric fiber-optic multiplexed strain sensor array: a minimum configuration

Low-coherence Michelson interferometric fiber-optic multiplexed strain sensor array: a minimum configuration

Model Identification of Bridges Using Measurement Data

Measurement of dynamic deformations using a path-unbalance Michelson-interferometer-based optical fiber sensing device

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