Oscillator interrogated time-of-flight optical fiber interferometer for global strain measurements

Jiang, Guohua; Vickle, Patrick Van; Peters, Kara; Knight, V.H.

doi:10.1016/j.sna.2006.08.023

Cited by 14 publications

(7 citation statements)

References 17 publications

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“…The reference fiber (also POF) can be used for temperature or other signal compensation. The phase of the optical sensor signal could also be compared to the original electrical signal used to modulate the laser source if a reference fiber is not required [51]. The key difference between this and classical, phase based, interferometric optical fiber sensors is that the phase shift measurement is of the intensity modulation from the VCO and not phase shifts of the propagating lightwave.…”

Section: Time-of-flight Pof Sensorsmentioning

confidence: 99%

Polymer optical fiber sensors—a review

Peters¹

2010

Smart Mater. Struct.

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Polymer optical fibers (POFs) have significant advantages for many sensing applications, including high elastic strain limits, high fracture toughness, high flexibility in bending, high sensitivity to strain and potential negative thermo-optic coefficients. The recent emergence of single-mode POFs has enabled high precision, large deformation optical fiber sensors. This article describes recent advances in both multi-mode and single-mode POF based strain and temperature sensors. The mechanical and optical properties of POFs relevant to strain and temperature applications are first summarized. POFs considered include multi-mode POFs, solid core single-mode POFs and microstructured single-mode POFs. Practical methods for applying POF sensors, including connecting and embedding sensors in structural materials, are also described. Recent demonstrations of multi-mode POF sensors in structural applications based on new interrogation methods, including backscattering and time-of-flight measurements, are outlined. The phase-displacement relation of a single-mode POF undergoing large deformation is presented to build a fundamental understanding of the response of single-mode POF sensors. Finally, this article highlights recent single-mode POF based sensors based on polymer fiber Bragg gratings and microstructured POFs.

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Section: Time-of-flight Pof Sensorsmentioning

confidence: 99%

Polymer optical fiber sensors—a review

Peters¹

2010

Smart Mater. Struct.

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452

245

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“…Further, unlike other types of distributed sensors and sensing techniques, which require sophisticated data analysis, the proposed global sensors can be quickly interrogated to provide real-time information regarding the overall condition of the structure. The recently demonstrated oscillator interrogated time of flight measurement provides an absolute measurement of the span length change [13].…”

Section: Global Sensor Measurementsmentioning

confidence: 99%

Global and Local Fiber Optic Sensors for Health Monitoring of Civil Engineering Infrastructure Retrofit with FRP Materials

Jiang

Dawood

Peters

et al. 2009

Structural Health Monitoring

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Fiber-reinforced polymer (FRP) materials are currently used for strengthening civil engineering structures and bridges. The effectiveness of the strengthening system is highly dependent on the bond characteristics of the FRP material to the external surface of the structure. This article presents the application of two types of fiber optic sensors, which can be embedded in FRP materials to monitor the global and local behavior of the strengthened structure, respectively. The global sensor is designed to evaluate the overall condition of a structure based on the measured elongation of the FRP layer along the entire span of the structure. The success of this low-cost global sensor has been demonstrated using a full-scale prestressed concrete bridge girder that was loaded up to failure. The test results indicate that this type of sensor can be used to identify major changes in the overall behavior of the structure such as cracking of prestressed members or yielding of the internal reinforcement. The second sensor component consists of fiber Bragg grating sensors. The sensors were used to monitor the behavior of steel double-lap shear specimens tested under tensile loading up to failure. The measurements were used to identify abnormal structural behaviors such as epoxy cracking and/or FRP debonding. The test results compared well to the numerical values obtained from a three dimensional shear-lag model that was previously developed to predict the sensor response.

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“…The recently demonstrated oscillator interrogated time of flight measurement provides an absolute measurement of the span length change (Jiang et al, 2007).…”

Section: Global Sensor Measurementsmentioning

confidence: 99%

“…For the optical fiber interferometer used in this study, this time-of-flight change is measured through comparison of the sinusoidal sensor and a reference oscillating electrical signal. Details of the interrogation system can be found in Jiang et al (2007). The minimum resolution of the length measurement for this interrogated is 9.5mm; however by splicing N fibers in the ribbon together to form one continuous optical path, the minimum resolution can be decreased by a factor of N.…”

Section: Global Sensor Measurementsmentioning

confidence: 99%

Self-monitoring fiber reinforced polymer strengthening system for civil engineering infrastructures

et al. 2008

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Fiber reinforced polymer (FRP) materials are currently used for strengthening civil engineering infrastructures. The strengthening system is dependant on the bond characteristics of the FRP to the external surface of the structure to be effective in resisting the applied loads. This paper presents an innovative self-monitoring FRP strengthening system. The system consists of two components which can be embedded in FRP materials to monitor the global and local behavior of the strengthened structure respectively. The first component of the system is designed to evaluate the applied load acting on a structure based on elongation of the FRP layer along the entire span of the structure. Success of the global system has been demonstrated using a full-scale prestressed concrete bridge girder which was loaded up to failure. The test results indicate that this type of sensor can be used to accurately determine the load prior to failure within 15 percent of the measured value. The second sensor component consists of fiber Bragg grating sensors. The sensors were used to monitor the behavior of steel double-lap shear splices tested under tensile loading up to failure. The measurements were used to identify abnormal structural behavior such as epoxy cracking and FRP debonding. Test results were also compared to numerical values obtained from a three dimensional shear-lag model which was developed to predict the sensor response.

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Oscillator interrogated time-of-flight optical fiber interferometer for global strain measurements

Cited by 14 publications

References 17 publications

Polymer optical fiber sensors—a review

Polymer optical fiber sensors—a review

Global and Local Fiber Optic Sensors for Health Monitoring of Civil Engineering Infrastructure Retrofit with FRP Materials

Self-monitoring fiber reinforced polymer strengthening system for civil engineering infrastructures

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