Passive-quadrature demodulated localized-Michelson fiber-optic strain sensor embedded in composite materials

Valis, Tomas; Tapanes, Edward; Liu, K.; Measures, Raymond M.

doi:10.1109/50.76669

Cited by 37 publications

(9 citation statements)

References 30 publications

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“…Potential sensor systems for achieving four simultaneous measurands in-·clude combined dual-wavelength polarimetric-interferometric sensors or dualwavelength Fabry-Perot sensors in HiBi fiber [Valis, 1991]. The former is a direct combination of the ideas discussed in the preceding paragraph, while the latter creates simultaneous Fabry-Perot cavities along tlie two eigen axes in a HiBi fiber [Valis and Measures, 1992].…”

Section: Exact Inverse Phase-strain-temperature Relationsmentioning

confidence: 99%

“…Since the reference and the signal arms are both sensitive to the external fields, the signal and reference arms are usually closely coupled together along their entire length except the sensing region (Corke et al, 1983, Valis et al, 1991. This provides a high degree of common mode rejection and substantially reduces the effect of environmentally induced perturbations.…”

Section: Measurement Using Optical Fibermentioning

confidence: 99%

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Applications of Fiber Optic Sensors in Engineering Mechanics

Ansari¹

1993

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Section: Exact Inverse Phase-strain-temperature Relationsmentioning

confidence: 99%

Section: Measurement Using Optical Fibermentioning

confidence: 99%

Applications of Fiber Optic Sensors in Engineering Mechanics

Ansari¹

1993

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“…With these sensors, the measureand field induces fiber strain which in turn results in a phase shift in the interferometer output. Several different methods have been demonstrated to recover phase shift information from a remote two-beam interferometer including phase generated carrier [4] and 3X3 output coupler approaches [5,6]. These methods rely on the generation of sine/cosine phase quadrature signals to recover the interferometer signal of interest.…”

Section: Introductionmentioning

confidence: 99%

<title>Interferometric signal processing schemes for the measurement of strain</title>

Berkoff

Kersey

1991

SPIE Proceedings

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In this paper we demonstrate the measurement of fiber strain for use in embedded sensor applications. Both of these methods utilize source frequency interrogation to monitor fiber strain. The first system described provides absolute strain information from a single-mode interferometric sensor used to measure absolute surface strain induced by deflection of a cantilever beam. The second system presented demonstrates remote interrogation of a lead insensitive two-mode elliptical core fiber sensor to measure relative changes in fiber strain.

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“…al. [2]. The research on monitoring of concrete structures was performed by various fiber optic sensors.…”

Section: Introductionmentioning

confidence: 99%

<title>Failure detection of reinforced concrete beams with embedded fiber optic Michelson sensors</title>

et al. 2000

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The need to monitor and undertake remidial works on large structures has greatly increased in recent years due to the appearance of widespread faults in large structures such as bridges and buildings, etc, of 20 or more years of age. The health condition of structures must be monitored continuously to maintenance the structures. In order to do in-situ monitoring, the sensor is necessary to be embedded in the structures. Fiber optic sensors can be embedded in the structures to get the health information in the structures. The fiber sensor was constructed with 3x3 fiber couplers to sense the multi-point strains and failure instants. The 4 RC (reinforced concrete) beams were made to 2 of A type, 2 of B type beams. These beams were reinforced by the reinforcing bars, and were tested under the flexural loading. The behavior of the beams was simultaneously measured by the fiber optic sensors, electrical strain gages, and LVDT. The states of the beams were interpreted by these all signals. By these experiments, There were verified that the fiber optic sensors could measure the structural strains and failure instants of the RC beams. The fiber sensors were well operated until the failure of the beams. It was shown that the strains of the reinforcing steel bar can be used to monitor the health condition of the beams through the flexural test of RC beams. On the other words, the results were arrived that the two strains in the reinforcing bar measured at the same point can give the information of the structural health status. Also, the failure instants of beams were well detected from the fiber optic filtered signals.

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Passive-quadrature demodulated localized-Michelson fiber-optic strain sensor embedded in composite materials

Cited by 37 publications

References 30 publications

Applications of Fiber Optic Sensors in Engineering Mechanics

Applications of Fiber Optic Sensors in Engineering Mechanics

<title>Interferometric signal processing schemes for the measurement of strain</title>

<title>Failure detection of reinforced concrete beams with embedded fiber optic Michelson sensors</title>

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