Embedded white light interferometer fibre optic strain sensor for monitoring crack-tip opening in concrete beams

Yuan, Libo; Ansari, Fahard

doi:10.1088/0957-0233/9/2/014

Cited by 37 publications

(11 citation statements)

References 5 publications

(4 reference statements)

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“…Experimental results are presented and crack-tip opening displacement ͑CTOD͒ results are compared with crack-opening displacements ͑COD͒ measured by conventional transducers at the crack mouth in Ref. 33 To examine the feasibility of using the above fiberoptic sensor system in measuring the temperature in concrete at early ages, and to calculate concrete maturity by using the temperature data, the 24 h temperature monitoring experiments have been done after a length 172 mm fiberoptic sensor embedded in the concrete beam. Near the fiber, a thermocouple was embedded and used to independently monitor its temperature.…”

Section: Dual Use For Monitoring Temperature and Measuring Ctodmentioning

confidence: 99%

Recent progress of white light interferometric fiberoptic strain sensing techniques

Yuan

Zhou

Jin

et al. 2000

Review of Scientific Instruments

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Strain, deformation, and temperature measurements constitute some of the most interesting parameters to be monitored in composite materials or structures. White light interferometry offers good performance even for long-term measurements of these parameters. Based on the Michelson interferometer, a fiberoptic localized extensometer and multiplexing strain-sensing techniques are demonstrated in this article. Related problems such as the effect of optical fiber coating on an embedded sensor and the dual use of one sensor are discussed. Finally, application examples of surface strain and internal strain (0–6000 microstrain) and temperature (22–36 °C) of concrete sample are given.

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Section: Dual Use For Monitoring Temperature and Measuring Ctodmentioning

confidence: 99%

Recent progress of white light interferometric fiberoptic strain sensing techniques

Yuan

Zhou

Jin

et al. 2000

Review of Scientific Instruments

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“…Traditionally, lowfrequency vibration measurement of a structure has been conducted by using surface-mounted or structure-embedded sensors with accompanying signal processing circuits. These include thin metallic foil strain gauges, accelerometers based on piezoelectric materials, and fiber-optic strain measurement modules [1][2] . However, if the target structure is placed in a remote location or locally moving thus wiring the sensors is technically impractical, wireless measurement is desirable.…”

Section: Introductionmentioning

confidence: 99%

Wireless vibration sensor using frequency modulation technique

et al. 2012

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In recent years, wireless strain sensors have received attention as an efficient method to measure response of a structure in a remote location. Wireless sensors developed for remote measurement include RF wireless sensor modules and microstrip antenna-based sensors. In this paper, a simple wireless vibration sensor based on a piezoelectric sensor and the Frequency Modulation (FM) technique is developed for remote measurement of vibrating structures. The piezoelectric sensor can generate a voltage signal proportional to dynamic strain of the host structure. The voltage signal is then frequency modulated and transmitted wirelessly to a remote station by a simple FM transmitter circuit. Finally, the received signal is demodulated by a conventional FM radio circuit, and the vibration measurement data can be recovered. Since this type of wireless sensor employs a simple FM circuit, they do not require any wireless data transmission protocols allowing a low-cost wireless sensor in compact format. The proposed concept of the wireless vibration measurement is experimentally verified by measuring vibration of an aluminum cantilever beam. The proposed sensor could potentially be an efficient and cost effective method for measuring vibration of remote structures for dynamic testing or structural health monitoring.

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“…The gauge length of the optical fiber was required to be long enough to ensure high sensitivity in measurement. YUAN and ANSARI [15] used embedded white light interferometer fiber optic sensors to monitor the CTOD c in their fracture tests. Such interferometer techniques were capable of measuring a displacement resolving power with a high resolution up to 1 μm, but the accuracy of the measurement was very sensitive to the applied fiber optic gauge length.…”

Section: Introductionmentioning

confidence: 99%

Critical crack tip opening displacement of different strength concrete

Wang

Zhang

Dai

et al. 2011

J. Cent. South Univ. Technol.

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Critical crack tip opening displacement (CTOD c ) of concrete using experimental and analytical evaluation with seven different compressive strengths ranging from 30 up to 150 MPa was studied based on two types of fracture tests: three-point bending (TPB) and wedge splitting (WS). In the tests, the values of CTOD c were experimentally recorded using a novel technique, in which fiber Bragg grating (FBG) sensors were used, and two traditional techniques, in which strain gauges and clip gauges were deployed. The values of CTOD c of tested concrete were also predicted using two existing analytical formulae proposed by JENQ & SHAH and XU, respectively. It is found that the values of CTOD c obtained by both experimental measurements and analytical formulae exhibit a negligible variation as the compressive strength of concrete increases, and the test geometry adopted has little impact on the value of CTOD c . Regarding the experimental measurement of CTOD c , the clip gauge method generally leads to a larger value of CTOD c and shows a more significant scatter as compared with the other two methods, while the strain gauge method leads to a slightly lower CTOD c as compared with the FBG sensor method. The analytical formula proposed by JENQ and SHAH is found to generally lead to an overestimation, while the analytical formula proposed by XU shows a good accuracy.

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Embedded white light interferometer fibre optic strain sensor for monitoring crack-tip opening in concrete beams

Cited by 37 publications

References 5 publications

Recent progress of white light interferometric fiberoptic strain sensing techniques

Recent progress of white light interferometric fiberoptic strain sensing techniques

Wireless vibration sensor using frequency modulation technique

Critical crack tip opening displacement of different strength concrete

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