Wavelength division multiplexed optical point-sensor networks using injection laser diode sources

Senior, John M.; Moss, Steven E.; Cusworth, S.D.

doi:10.1016/0030-3992(95)00063-1

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…The perceived requirement for optical sensor networks, rather than for independent measuring devices, has stimulated the investigation of multiplexing and networking techniques for optical point sensors. 8,9 White-light interferometry, as a technique employing low-coherence broadband light sources, has been a very active area of research in recent years. The idea of using a short-coherence-length source to separate the signals returning from a series of sensors was first published by Al-Chalabi et al 10 Brooks et al 11 proposed a series of Mach-Zehnder interferometers and a ladder-coherence multiplexing scheme.…”

Section: Introductionmentioning

confidence: 99%

Design of a fiber-optic quasi-distributed strain sensors ring network based on a white-light interferometric multiplexing technique

Yuan¹,

Zhou²,

Jin³

2002

Appl. Opt.

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A fiber-optic quasi-distributed strain sensors ring network has been designed based on a Mach-Zehnder optical paths interrogator. The optical paths matching for each sensor are discussed, and the optical power budgetary analysis is performed. The relation between the number of sensors and the intensity of the signals of the ring network is given for evaluation of the multiplexing capacity. Experimentally, a seven-sensor array ring network was realized under the condition of light source power 35 W at 1310 nm, and the distribution strain test was also demonstrated.

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Section: Introductionmentioning

confidence: 99%

Design of a fiber-optic quasi-distributed strain sensors ring network based on a white-light interferometric multiplexing technique

Yuan¹,

Zhou²,

Jin³

2002

Appl. Opt.

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Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

Yuan

Zhou

Jin

2003

Review of Scientific Instruments

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In smart structure applications where fiber sensors are embedded within structural materials, multiple lead in/out fibers are preferred for redundancy and improving reliability. The use of only one lead/out fiber is not optimal because the breakage of a fiber at one location due to, for example, local structural damage, would cause the failure of the whole sensing system. The multiplexing and networking techniques suitable for such applications have attracted considerable research recently. In this article, based on the bidirectional interrogation technique for white light interferometric sensors arrays, a multiplexed fiber optic deformation sensor loop network suitable for smart structure applications has been designed and demonstrated. Loop-network sensor systems are based on the white light interferometric technique. Michelson and Mach–Zehnder optical path interrogators have been developed and demonstrated, respectively. For the usually used one direction interrogate sensing system, it is clear that multiplexed sensor arrays suffer from relatively large fiber segment-induced optical reflective and excess insertion loss that generally limit the total number of sensors that can be accommodated in this configuration. This loop-network bidirection interrogating technique greatly extended the multiplexing capacity of fiber optic white light interferometric sensors system. A practical implementation of this technique is presented which makes use of a popular light emitting diode, superluminescent diode, or amplified spontaneous emission optical light source and standard single mode fiber, which are commonly used in the communication industry. The sensor loop topology is completely passive and absolute length measurements can be obtained for each sensing fiber segment so that it can be used to measure quasidistribution strain or temperature. For large-scale smart structures, this technique not only extends the multiplexing potential, but also provides a redundancy for the sensing system. It means that the sensor loop permits one point breakdown, because the sensing system will still work whenever the embedded sensor loop breaks somewhere.

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Improving the reliability of multiplexed fiber optic low-coherence interferometric sensors by use of novel twin-loop network topologies

Yang

Yuan

Jin

2007

Review of Scientific Instruments

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Novel twin-loop network topologies for multiplexing fiber optic low-coherence reflectometric sensors are proposed and theoretically analyzed. The sensing fibers are made by connecting segments of standard single-mode fibers with partial reflections at the fiber joints and are completely passive. Absolute length measurement can be made for each segment of the sensing fiber so that strain or temperature distribution along the entire sensing fiber can be derived. It is expected that novel topologies would help as to improve the reliability of the sensor network by providing multiple accesses to each of the sensing segment so that most of the sensing segments can still be interrogated even when one or more point breakages occur along the transmission fibers. A nine-sensor twin-loop sensing network was constructed and experimentally tested by use of a Michelson low-coherence interferometer, and the results obtained agree with our theoretical prediction. The novel network topologies may be used for large-scale smart structure applications where breakages of transmission fibers may occur during the stages of sensor imbedding, installation, and structure-in-service cycles.

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Wavelength division multiplexed optical point-sensor networks using injection laser diode sources

Cited by 6 publications

References 23 publications

Design of a fiber-optic quasi-distributed strain sensors ring network based on a white-light interferometric multiplexing technique

Design of a fiber-optic quasi-distributed strain sensors ring network based on a white-light interferometric multiplexing technique

Recent progress in bidirectional interrogation techniques for enhancing multiplexing capability of fiber optic white light interferometric sensors

Improving the reliability of multiplexed fiber optic low-coherence interferometric sensors by use of novel twin-loop network topologies

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